Mihsaba›All Calculators

All Calculators

Choose a category, then open the calculator you need. Every tool is free and includes the method, an example, and practical notes.

Finance

Calculate loans, discounts, taxes, and interest with ease. · 29

−

Discount Calculator – Sale Price, Savings & Extra Discount

Calculate sale price, savings and effective discount with an optional extra discount, tax and multiple currencies.

VAT Calculator – Add or Extract Tax

Add VAT to a pre-tax amount or extract VAT from a tax-inclusive total, showing net amount, tax and gross total.

Loan Calculator – Monthly Payment & Extra Payments

Calculate monthly payment and total interest, then compare how an extra monthly payment changes payoff time and interest saved, with optional financed fees.

↗

Compound Interest Calculator – Contributions & Compounding

Calculate future balance and compound growth with selectable compounding frequency, optional monthly contributions and contribution timing.

⌂

Mortgage Calculator

Estimate monthly mortgage payment, amount financed and total interest from property price, down payment, rate and term.

Simple Interest Calculator

Calculate simple interest and ending amount from principal, annual rate and time in years, months or days.

Tip Calculator – Split Bill, Tax & Service Charge

Calculate tip, tax, service charge, grand total and each person’s share with quick tip rates, flexible tip basis and rounding options.

↕%

Profit Margin Calculator

Calculate profit, margin, markup and the selling price required for an optional target margin.

◈

Savings Calculator

Project savings growth from a starting balance, monthly contributions and an annual compounded rate, with contributions, interest and optional goal gap.

¤/u

Unit Price Calculator

Calculate price per unit for two products and compare which package or quantity offers the better value.

⛽

Fuel Cost Calculator

Estimate trip fuel use and cost from distance, vehicle efficiency and fuel price, with multiple unit formats and cost splitting.

ROI

ROI Calculator

Calculate net gain or loss, ROI percentage and return multiple with optional fees and cash income, without confusing ROI with annualized return.

CAGR

CAGR Calculator

Calculate compound annual growth rate between a starting and ending value over a period, with total growth, absolute change and value multiple.

BEP

Break-Even Calculator

Calculate break-even units and revenue from fixed costs, selling price and variable cost, with contribution margin, target profit and margin of safety.

Tax%

Sales Tax Calculator

Add sales tax to a pre-tax amount, remove tax from a tax-inclusive total, or recover the effective rate from subtotal and total.

MU%

Markup Calculator

Find selling price, profit and margin from cost plus markup, reverse markup from a known price, or convert a target margin into a price.

%→¤

Commission Calculator

Calculate sales commission with a flat rate or graduated marginal tiers, optional base pay, tier breakdown and effective commission rate.

¤/h

Salary to Hourly Calculator

Convert hourly, daily, weekly, monthly and annual pay using your own hours per week, days per week and paid weeks per year assumptions.

↘¤

Depreciation Calculator

Estimate book depreciation using straight-line or double-declining balance with salvage value, useful life and a selected year.

⚡¤

Electricity Cost Calculator – Appliance kWh & Running Cost

Calculate appliance electricity use in kWh and daily, monthly or annual running cost from watts, hours used, quantity and your electricity price per kWh.

h×¤

Overtime Pay Calculator

Estimate regular, overtime and double-time pay from your hourly rate and user-supplied multipliers without assuming a local labor rule.

Present Value Calculator

Discount a future lump sum to present value using an annual discount rate, time horizon and chosen compounding frequency, with discount breakdown.

⇣

Loan Payoff Calculator

Estimate payoff time and remaining interest from current balance and payment, then compare how an extra monthly principal payment changes time and interest.

EAR

Effective Annual Rate Calculator

Convert between nominal annual rate and effective annual rate with periodic or continuous compounding, including periodic rate and annual difference.

DTI

Debt-to-Income Ratio Calculator

Calculate housing and total debt-to-income ratios from recurring monthly payments and gross monthly income, without assuming a universal lending threshold.

PMT

Annuity Calculator

Calculate present value, future value, or the required level payment for ordinary annuities and annuities due with configurable payment frequency.

NPV

Net Present Value Calculator

Calculate net present value for periodic cash flows using a discount rate per period, with discounted future cash flows and undiscounted total.

IRR

Internal Rate of Return Calculator

Calculate one or more internal rates of return for periodic cash flows: rates that make NPV equal zero, with warnings for multiple roots or no root in the search range.

↩

Payback Period Calculator

Calculate simple and discounted payback from an initial investment and periodic cash-flow series, including fractional-period interpolation at the recovery point.

Math

Work out percentages, averages, and other everyday math. · 59

Percentage Calculator – Percent, Increase & Decrease

Calculate a percentage of a number, find what percent one value is of another, reverse-solve the original number, or apply a percentage increase or decrease with the formula shown.

x̄

Average Calculator – Mean, Median, Sum & Range

Calculate mean, median, sum, count, minimum, maximum and range from a list of numbers.

Δ%

Percentage Change Calculator

Calculate percentage increase or decrease and the absolute difference between an old and a new value.

a:b

Ratio & Proportion Calculator

Simplify A:B, see its decimal and share of total, solve D in A:B = C:D, and optionally split a total by the ratio.

Fraction Calculator

Add, subtract, multiply or divide two fractions, automatically simplify the result, and see fraction, mixed-number and decimal forms.

∣

GCD & LCM Calculator

Find the GCD and LCM of two or more positive integers using exact integer arithmetic and the Euclidean algorithm.

×10ⁿ

Scientific Notation Calculator

Convert numbers to scientific, E and engineering notation and perform basic arithmetic on very large or small values.

XIV

Roman Numeral Converter

Convert integers from 1 to 3999 to standard Roman numerals and back with strict format validation.

Δ÷avg

Percentage Difference Calculator

Compare two values without treating either as the starting point, with absolute difference, reference average and symmetric percent difference.

x̄ Me Mo

Mean, Median, Mode & Range Calculator

Analyze a list of numbers and get mean, median, mode, range, sum, count, minimum and maximum.

P(A)

Probability Calculator

Calculate a simple event, two independent events, combinations and permutations, or binomial probability with explicit assumptions and limits.

ax²

Quadratic Equation Calculator

Solve ax²+bx+c=0 for real or complex roots and show the discriminant, root type, parabola vertex and axis of symmetry.

πr²

Circle Calculator

Enter radius, diameter, circumference or area to derive all four core circle measurements from one known value.

a²+b²

Pythagorean Theorem Calculator

Find the hypotenuse or either leg of a right triangle, plus area, perimeter and acute angles with input validation.

%err

Percent Error Calculator

Compare a measured value with an accepted reference and show absolute error, signed error and percent error, including the zero-reference case.

V=IR

Ohm’s Law Calculator

Enter any two of voltage, current, resistance and power to solve the other two, with common milli, micro, kilo and mega unit prefixes.

△

Triangle Calculator

Solve a triangle from SSS, SAS, ASA/AAS or SSA and return sides, angles, area, perimeter, inradius and circumradius.

Δy/Δx

Slope Calculator

Find slope, rise, run, angle, line equation, midpoint and distance from two points, with explicit handling for vertical lines.

16:9

Aspect Ratio Calculator

Find an aspect ratio from dimensions or solve a missing width or height while resizing, with simplified ratio, decimal ratio and orientation.

πr²h

Cylinder Calculator

Calculate cylinder volume, base area, lateral area, total surface area and circumference from radius or diameter plus height.

Σxw/Σw

Weighted Average Calculator

Calculate a weighted average from values and weights, with total weight, weighted sum, simple mean and an optional next value needed to hit a target.

▭

Rectangle Calculator

Calculate rectangle area, perimeter and diagonal from length and width, or recover the two sides from a valid area-and-perimeter pair.

◯³

Sphere Calculator

Enter a radius or diameter to get sphere volume, surface area, great-circle circumference and great-circle area with correct unit powers.

2↔16

Number Base Converter

Convert integers exactly between binary, octal, decimal and hexadecimal using arbitrary-precision integer arithmetic.

□

Square Calculator – Area, Perimeter & Diagonal

Calculate a square’s perimeter, area, side length or diagonal from any one known measurement, with inscribed and circumscribed radii included.

△³

Cone Calculator – Volume & Surface Area

Calculate cone volume, total surface area, lateral area, base area and slant height from radius or diameter plus height or slant height.

d÷t

Average Speed Calculator

Solve average speed, distance or time from the other two values, with km/h, mph and m/s equivalents and consistent distance units.

nPr/nCr

Permutation & Combination Calculator

Calculate exact nPr and nCr and compare repetition-allowed counts for whole-number inputs up to n and r = 1000 without floating-point rounding.

◫³

Cube Calculator

Start from side length, volume, surface area or space diagonal and recover the cube’s main measurements with correct unit powers.

⏢

Trapezoid Calculator – Area, Perimeter & Height

Calculate trapezoid area, perimeter and midsegment, or solve for height or a missing base when the required measurements are known.

▭³

Rectangular Prism Calculator

Calculate cuboid volume, total and lateral surface area, base area, space diagonal and edge length, or recover height from a known volume.

⬡

Regular Polygon Calculator

Find area, perimeter, interior/exterior angles, apothem, circumradius and diagonal count from the side count and one known size.

GPA

GPA Calculator

Calculate term and cumulative GPA from course grade points and credits on a 4.0 or 5.0 scale, with an optional target-GPA planner.

zσ

Z-Score Calculator

Calculate z from a raw value, mean and standard deviation, recover a raw value from z, or convert a percentile to z with normal-tail probabilities.

aₙ

Arithmetic Sequence Calculator

Calculate the nth term, sum of the first n terms, average and an initial term preview from the first term and common difference.

rⁿ

Geometric Sequence Calculator

Calculate the nth term, finite sum and initial terms, plus the infinite sum when the common ratio has absolute value below 1.

Midpoint Calculator

Find the midpoint between two points in 2D or 3D, together with coordinate differences and the half-displacement vector.

↔

Distance Between Two Points Calculator – Euclidean, 2D & 3D

Calculate Euclidean distance between two 2D or 3D points, plus Manhattan and Chebyshev distances and coordinate deltas.

▦

Matrix Calculator

Add, subtract and multiply 2×2 or 3×3 matrices, and calculate determinant, transpose and inverse with operation validation.

log

Logarithm Calculator

Calculate natural, common, binary or custom-base logarithms, plus the inverse exponent operation.

p×q

Prime Factorization Calculator

Factor a positive integer into primes and show exponential form, distinct prime factors, divisor count and prime/composite status.

▱

Parallelogram Calculator – Area, Perimeter & Diagonals

Solve a parallelogram from two side lengths and the included angle, calculating area, perimeter, height and both diagonals.

⬭

Ellipse Calculator – Area, Circumference & Foci

Calculate ellipse area, approximate circumference, eccentricity and focal distance from the semi-major and semi-minor axes.

a+bi

Complex Number Calculator

Add, subtract, multiply or divide two complex numbers and calculate modulus, argument, conjugate and polar form of the result.

A+

Grade Calculator

Calculate a weighted course grade from multiple scores and weights, or find the final-exam score needed to reach a target.

Factorial Calculator

Calculate n! exactly for non-negative integers up to 2000, with digit count and trailing-zero count.

mod

Modulo Calculator

Calculate exact integer quotient and remainder, showing both programming-style remainder and Euclidean modulo for negative inputs.

ⁿ√

Nth Root Calculator

Calculate real nth roots, including odd roots of negative numbers, with a power-back verification.

Geometric Mean Calculator

Calculate the geometric mean of positive values with a numerically stable log method, alongside the arithmetic mean and count.

Harmonic Mean Calculator

Calculate the harmonic mean for positive rates or values, with geometric and arithmetic means for comparison.

◔

Circle Sector Calculator

Calculate sector area, arc length, chord, sector perimeter and circular-segment area from radius and angle in degrees or radians.

◇

Rhombus Calculator – Area, Perimeter & Diagonals

Calculate rhombus area, perimeter, height, side length and diagonals from the two diagonals or from a side and included angle.

↗

Linear Interpolation Calculator

Estimate y at a target x from two known points, with slope, interval position and an interpolation-versus-extrapolation flag.

△▭

Triangular Prism Calculator

Calculate triangular-base area, volume, lateral area and total surface area from the three triangle sides and prism length using a stable Heron formula.

△□

Square Pyramid Calculator

Calculate a right square pyramid’s volume, face slant height, lateral edge, lateral area and total surface area from base side and vertical height.

⌒

Cone Frustum Calculator

Calculate cone-frustum volume, slant height, lateral area and total surface area from the two radii and perpendicular height.

Ax=b

System of Linear Equations Calculator – 2×2 & 3×3

Solve 2-variable and 3-variable systems of linear equations with partial-pivot Gaussian elimination, including unique, no-solution and infinitely-many cases.

2π²Rr²

Torus Calculator

Calculate torus volume, surface area, inner radius and outer radius from major radius R and tube radius r for ring or horn tori.

A·B

Vector Calculator

Calculate two 3D vector magnitudes, dot product, cross product and its magnitude, plus the angle between nonzero vectors.

Statistics & Probability

Analyze data, probability, distributions, and statistical tests. · 18

σ / s

Standard Deviation Calculator

Calculate mean, sum of squared deviations, variance and standard deviation for both population and sample from one data set.

Pₖ

Percentile Calculator

Find any percentile from a dataset using inclusive linear interpolation or nearest-rank, with Q1, median, Q3 and IQR.

Correlation Coefficient Calculator

Calculate Pearson’s r, r² and the simple regression line from paired data, with a reminder that correlation does not prove causation.

Confidence Interval Calculator

Calculate a confidence interval for a mean using Student’s t or for a proportion using the Wilson interval, with standard error, critical value and margin.

Sample Size Calculator

Calculate the minimum sample size for estimating a proportion or mean from confidence level and margin of error, with optional finite-population correction.

Normal Distribution Calculator

Calculate left-tail, right-tail and between-value probabilities for a normal distribution, or invert a percentile to an x value and z-score.

Standard Error Calculator

Calculate the standard error of a mean or proportion from sample inputs, with a clearly labeled approximate 95% normal-theory margin.

Bin(n,p)

Binomial Distribution Calculator

Calculate exact, at-most and at-least binomial probabilities for k successes in n independent trials with constant success probability p, plus mean, variance and standard deviation.

Pois(λ)

Poisson Distribution Calculator

Calculate exact, at-most and at-least Poisson probabilities from mean rate λ and integer count k, plus mean, variance and standard deviation.

CV%

Coefficient of Variation Calculator

Calculate coefficient of variation (CV) from a dataset with mean, standard deviation and variance, using sample or population formulas.

MAD

Mean Absolute Deviation Calculator

Calculate mean absolute deviation around the mean, median or a custom center, with mean, median and count shown alongside.

ŷ=a+bx

Linear Regression Calculator

Fit a simple least-squares regression line from X and Y values, including slope, intercept, correlation r, R² and an optional prediction.

Exp(λ)

Exponential Distribution Calculator

Calculate exponential PDF, CDF, survival and interval probabilities plus mean, variance and median from a positive rate λ.

P-Value Calculator

Calculate a p-value from a z, t or chi-square statistic, with tail selection, degrees of freedom and an optional significance-level comparison.

One-Sample T-Test Calculator

Calculate the t statistic, degrees of freedom and p-value for a one-sample t-test from sample mean, standard deviation, sample size and hypothesized mean.

χ²

Chi-Square Goodness-of-Fit Calculator

Calculate the chi-square statistic and p-value from observed and expected frequency lists for a goodness-of-fit test, with degrees of freedom.

P(A|B)

Bayes’ Theorem Calculator

Update an event probability after new evidence using the prior probability and the likelihood of the evidence when the event is true or false.

Cov

Covariance Calculator

Calculate sample or population covariance from two equal-length datasets, with both means and Pearson correlation for context.

Physics

Calculate motion, energy, waves, heat, fluids, and optics. · 33

½mv²

Kinetic Energy Calculator

Solve for kinetic energy, mass or speed from KE=½mv² with common mass, speed and energy units.

v=fλ

Wavelength to Frequency Calculator – λ, f & Wave Speed

Convert wavelength to frequency or frequency to wavelength, or solve wave speed from v=fλ, with multiple units and a vacuum-light-speed preset.

p=mv

Momentum Calculator – p = mv, Mass & Velocity

Calculate linear momentum from mass and velocity, or solve for mass or velocity from p=mv, with common units and signed 1D direction.

mgh

Gravitational Potential Energy Calculator

Solve gravitational potential energy, mass, height or gravitational acceleration from U=mgh near a surface where g can be treated as constant, with SI and imperial units.

↗

Projectile Motion Calculator

Calculate range, flight time, maximum height, velocity components and impact speed from launch speed, angle, initial height and gravity, neglecting air resistance.

mv²/r

Centripetal Force Calculator

Solve centripetal force, mass, radius or speed from F=mv²/r, or use angular speed with F=mrω², including centripetal acceleration and SI/imperial units.

Q=mcΔT

Specific Heat Calculator

Solve sensible-heat equation Q=mcΔT for heat energy, mass, specific heat capacity or temperature change with common energy and mass units.

W=Fd

Work Calculator (Physics)

Calculate mechanical work from force, displacement and their angle, with the parallel force component and positive/zero/negative work classification.

P=W/t

Mechanical Power Calculator

Calculate mechanical power from work and time or from force, velocity and angle, with watts, kilowatts and mechanical horsepower.

F=kx

Hooke’s Law Calculator

Solve spring-force magnitude, spring constant or displacement from Hooke’s law, with elastic potential energy.

Gm₁m₂/r²

Gravitational Force Calculator

Calculate gravitational attraction between two masses using Newton’s law of universal gravitation, plus each mass’s acceleration toward the other.

F=μN

Friction Force Calculator

Calculate friction magnitude from coefficient and normal force directly, or from mass and incline angle with the parallel gravity component.

J=Δp

Impulse & Momentum Calculator

Calculate impulse from force and time, resulting velocity change for a known mass, and initial/final momentum.

m₁v₁+m₂v₂

Perfectly Inelastic Collision Calculator

Calculate the shared final velocity for a 1D perfectly inelastic collision, with momentum and kinetic-energy loss.

g↓

Free Fall Calculator

Calculate impact time and final vertical velocity from a known height with optional initial downward velocity and selectable gravity.

vₑ

Escape Velocity Calculator

Calculate escape velocity from a body’s mass and radius from its center, plus local gravity and circular-orbit speed at that radius.

Simple Pendulum Calculator

Calculate a simple pendulum’s period and frequency from length and gravitational acceleration using the small-angle approximation.

ΔL

Thermal Expansion Calculator

Calculate length change and final length from initial length, linear expansion coefficient and temperature change.

Q=mL

Latent Heat Calculator

Solve energy, mass or specific latent heat during a phase change using Q=mL.

kAΔT/L

Heat Conduction Calculator

Estimate steady heat-transfer rate through a flat layer from conductivity, area, temperature difference and thickness, with optional energy over time.

ρgh

Hydrostatic Pressure Calculator

Calculate fluid gauge pressure from density, gravity and depth, plus absolute pressure when surface pressure is provided.

ρgV

Buoyant Force Calculator

Calculate buoyant force from fluid density, displaced volume and gravity, plus displaced-fluid mass.

√2gh

Torricelli’s Law Calculator

Calculate ideal efflux velocity from liquid head and volumetric flow rate from the opening area using Torricelli’s law.

M=v/a

Mach Number Calculator

Calculate Mach number from object or flow speed and local speed of sound, with an approximate flow-regime label and speed in km/h.

½ρCdAv²

Drag Force Calculator

Calculate drag force from fluid density, drag coefficient, reference area and speed, with dynamic pressure and drag power.

vₜ

Terminal Velocity Calculator

Calculate terminal velocity for a falling body from mass, gravity, fluid density, drag coefficient and reference area.

½ρCLAv²

Lift Force Calculator

Calculate lift force from fluid density, lift coefficient, reference area and speed, with dynamic pressure.

f′

Doppler Effect Calculator

Calculate observed sound frequency when source and observer move toward each other through a stationary medium.

n₁sinθ₁

Snell’s Law Calculator

Calculate refraction angle from refractive indices and incidence angle, with total internal reflection and critical-angle checks.

1/f

Thin Lens Calculator

Calculate image distance and magnification from focal length and object distance using the thin-lens sign convention.

mλ=d sinθ

Diffraction Grating Calculator

Calculate diffraction angle from grating line density, wavelength and order, with the maximum possible order.

E=hν

Photon Energy Calculator

Calculate photon frequency and energy in joules, electronvolts and kilojoules per mole from wavelength.

½ᵗ

Radioactive Decay Calculator

Calculate remaining and decayed quantity after a given time from initial amount and half-life.

Engineering

Calculators for circuits, electricity, piping, pumps, and engineering applications. · 22

Ceq

Capacitor Series and Parallel Calculator

Calculate equivalent capacitance for an ideal list of capacitors in series or parallel, supporting F, mF, µF, nF and pF.

τ=RC

RC Time Constant Calculator

Calculate RC time constant, cutoff frequency, 5τ settling time and charging/discharging percentages and voltages at a chosen time.

R∥

Series & Parallel Resistor Calculator – Equivalent Resistance

Calculate equivalent resistance for multiple resistors in series or parallel, with Ω, kΩ and MΩ inputs and the same resistor list compared both ways.

Reynolds Number Calculator

Calculate Reynolds number from density, speed, characteristic length and dynamic viscosity, or from kinematic viscosity, with a circular-pipe flow guide.

P=VI

Electrical Power Calculator

Calculate electrical power, voltage, current and resistance from a known pair of values, with optional energy use in kWh over a run time.

Vout

Voltage Divider Calculator

Calculate output voltage and divider current for R1/R2, with an optional load resistance to show loading effects.

½CV²

Capacitor Energy Calculator

Solve capacitor energy, capacitance or voltage from E=½CV², with charge Q=CV and common capacitance units.

Capacitive Reactance Calculator

Calculate capacitive reactance from frequency and capacitance with engineering units, plus angular frequency and optional RMS current.

Inductive Reactance Calculator

Calculate inductive reactance from frequency and inductance with engineering units, plus angular frequency and optional RMS current.

Power Factor Calculator

Calculate power factor, apparent power, reactive power and phase angle from voltage, current and real power for a single-phase circuit.

RLC

RLC Impedance Calculator

Calculate XL, XC, net reactance, impedance magnitude and phase angle for a series RLC circuit from R, L, C and frequency.

f₀

LC Resonant Frequency Calculator

Calculate resonant frequency, angular frequency and period for an ideal LC circuit from inductance and capacitance with common engineering units.

Np:Ns

Transformer Ratio Calculator

Calculate turns ratio, voltage ratio and secondary current for an ideal transformer, with optional secondary-turn calculation from primary turns.

🔋

Battery Runtime Calculator

Estimate battery energy and runtime from voltage, capacity in Ah and load watts, with optional efficiency and usable-capacity factors.

A₁v₁

Continuity Equation Calculator

Solve second velocity or area for incompressible flow using A₁v₁=A₂v₂, with volumetric flow rate.

P+½ρv²

Bernoulli Equation Calculator

Calculate pressure at a second point in ideal flow from pressure, velocity, elevation and density at two points.

F/A

Hydraulic Press Calculator

Calculate output force from Pascal’s principle using piston force and areas, with ideal pressure and force multiplication ratio.

ΔP

Pipe Pressure Drop Calculator

Calculate straight-pipe pressure drop and head loss with the Darcy-Weisbach equation from friction factor, length, diameter, density and velocity.

πr⁴ΔP

Poiseuille’s Law Calculator

Calculate laminar flow in a circular tube from pressure drop, radius, dynamic viscosity and length, with mean velocity and Reynolds number.

ρgQH

Pump Power Calculator

Calculate hydraulic power and required shaft power from fluid density, flow rate, pump head and efficiency.

Qᵥ

Venturi Flow Calculator

Calculate flow through a horizontal Venturi meter from inlet/throat diameters, pressure difference, fluid density and discharge coefficient.

ν=μ/ρ

Kinematic Viscosity Calculator

Calculate kinematic viscosity from dynamic viscosity and density, with conversion to centistokes.

Chemistry

Calculate concentration, pH, gas laws, yield, and osmotic properties. · 8

PV=nRT

Ideal Gas Law Calculator – PV = nRT

Solve the ideal gas equation PV=nRT for pressure, volume, moles or temperature, with automatic unit conversion and absolute-temperature validation.

P₁V₁

Boyle’s Law Calculator

Calculate final pressure or volume for an ideal gas at constant temperature using P₁V₁=P₂V₂.

V/T

Charles’s Law Calculator

Calculate final ideal-gas volume at constant pressure from initial volume and two temperatures, with Celsius-to-Kelvin handling.

M=n/V

Molarity Calculator

Calculate solution molarity from amount in moles and solution volume in liters, with mmol/L conversion.

C₁V₁

Dilution Calculator

Calculate final volume and solvent to add when diluting a solution from a stock concentration to a lower target concentration using C₁V₁=C₂V₂.

pH & pOH Calculator

Calculate pH, pOH and complementary ion concentration from H⁺ or OH⁻ concentration assuming Kw=10⁻¹⁴ near 25°C.

Percent Yield Calculator

Calculate percent yield from actual and theoretical yield, with the amount difference and percentage shortfall relative to theoretical yield.

Π=iMRT

Osmotic Pressure Calculator

Calculate osmotic pressure from molarity, temperature and van’t Hoff factor using Π=iMRT, with atm, kPa and mmHg outputs.

Health

Estimate general indicators such as BMI and daily energy needs. · 4

BMI

BMI Calculator

Calculate adult BMI and understand its screening category and important limitations.

kcal

Calorie Calculator – Daily Calories & TDEE

Estimate BMR and daily maintenance calories from age, height, weight, sex and activity level, with metric/US units, activity comparisons and clearly labeled illustrative scenarios.

⚡

BMR Calculator

Estimate resting energy with the Mifflin–St Jeor equation and understand how BMR differs from daily needs.

🏃

Running Pace Calculator

Solve running pace, finish time or distance from two known values, with min/km, min/mi, speed and same-pace projections for common race distances.

Date & Time

Calculate age, durations, and differences between dates. · 7

◷

Age Calculator – Exact Age, Days & Next Birthday

Calculate exact age on any reference date in years, months and days, plus total months, weeks and days, birth weekday and next birthday.

⏱

Hours Calculator – Hours Worked & Decimal Hours

Calculate hours and minutes between two times, subtract unpaid breaks, handle overnight shifts, convert to decimal hours and total minutes, and optionally estimate pay.

↔

Date Difference Calculator

Calculate full days between two dates and understand standard versus inclusive counting.

⏱

Time Duration Calculator

Calculate elapsed time between a start and end time in hours, minutes and decimal hours, including overnight spans and an optional break.

±📅

Date Add/Subtract Calculator

Add or subtract years, months, weeks and days from a date with month-end clamping, leap-year handling and weekday output.

📅✓

Business Days Calculator

Count business days between dates or add/subtract working days, with selectable weekend rules and optional custom holidays.

⏱✓

Work Hours Calculator

Calculate net worked time from start, end and unpaid break, including overnight shifts and optional hourly-pay projections.

Converters

Convert values between length, weight, temperature, and more. · 20

↔

Length Converter

Convert accurately among metres, kilometres, centimetres, feet and inches with explained factors.

Temperature Converter

Convert among Celsius, Fahrenheit and kelvin with formulas and absolute-zero validation.

m²

Area Converter – m², ft², Acres & Hectares

Convert between square meters, square kilometers, hectares, acres, square feet, square yards and square centimeters using precise factors.

km/h

Speed Converter

Convert speed between km/h, mph, m/s, knots and ft/s, with common units shown together for quick comparison.

Volume Converter

Convert liters, milliliters, cubic meters, cubic centimeters, US/UK gallons, cups and fluid ounces with clearly labeled standards.

Weight & Mass Converter

Convert milligrams, grams, kilograms, metric tonnes, pounds, ounces, stones and US short tons using precise international factors.

Data Storage Converter

Convert between bits, bytes, decimal KB–PB and binary KiB–PiB while keeping SI and IEC definitions explicit.

bar↔psi

Pressure Converter – Torr, mmHg, PSI, Bar & atm

Convert pressure between Torr, mmHg, psi, bar, atm, Pa, kPa, MPa and other common units with explicit conversion definitions.

J↔kWh

Energy Converter

Convert between joules, kilojoules, megajoules, Wh, kWh, calories, kilocalories, BTU, electronvolts and foot-pounds.

W↔hp

Power Converter

Convert W, kW, MW, GW, mechanical and metric horsepower, BTU/h, tons of refrigeration and other power units with explicit definitions.

N↔lbf

Force Converter

Convert newtons, kilonewtons, kilogram-force, pound-force, dynes and other force units while clearly separating force from mass.

Hz↔RPM

Frequency Converter – Hz, RPM, Period & rad/s

Convert frequency among Hz, kHz, MHz, GHz, THz, RPM, RPS, rad/s and BPM, and convert frequency to cycle period when the value is positive.

N·m

Torque Converter

Convert N·m, kN·m, N·cm, lbf·ft, lbf·in, kgf·m, kgf·cm, ozf·in, dyn·cm and other common torque units.

Density Converter

Convert kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, lb/US gal and other common density units through a clear SI base.

m/s²

Acceleration Converter

Convert m/s², standard g, ft/s², in/s², Gal, mGal, km/h/s, mph/s and other acceleration units while preserving sign.

MPG↔L/100

Fuel Economy Converter

Convert US MPG, Imperial MPG, L/100km, km/L and mi/L with explicit US/UK gallon definitions and reciprocal-safe math.

°↔rad

Angle Converter

Convert degrees, radians, gradians, turns, arcminutes, arcseconds and milliradians, with common equivalents shown together.

Mb/s

Data Rate Converter

Convert bps, Kbps, Mbps, Gbps and byte-per-second units, including decimal SI and binary IEC prefixes with clear bit-versus-byte handling.

L/min

Volumetric Flow Rate Converter

Convert volumetric flow among L/s, L/min, m³/s, m³/h, US/Imperial GPM, ft³/s, ft³/min and barrels/day.

Angular Velocity Converter

Convert angular velocity among rad/s, rad/min, degrees per second or minute, RPM and revolutions per second while preserving signed direction.