MihsabaHow to choose a calculator
Use correct rated values and units, and verify real design limits and safety standards before relying on a result in engineering work.
Engineering
Engineering tools cover practical circuit, power, component, piping, pump and fluid-system calculations.
Available calculators
Calculators for circuits, electricity, piping, pumps, and engineering applications.
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=RCRC 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.
ReReynolds Number Calculator
Calculate Reynolds number from density, speed, characteristic length and dynamic viscosity, or from kinematic viscosity, with a circular-pipe flow guide.
P=VIElectrical 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.
VoutVoltage Divider Calculator
Calculate output voltage and divider current for R1/R2, with an optional load resistance to show loading effects.
½CV²Capacitor Energy Calculator
Solve capacitor energy, capacitance or voltage from E=½CV², with charge Q=CV and common capacitance units.
XcCapacitive Reactance Calculator
Calculate capacitive reactance from frequency and capacitance with engineering units, plus angular frequency and optional RMS current.
XLInductive Reactance Calculator
Calculate inductive reactance from frequency and inductance with engineering units, plus angular frequency and optional RMS current.
PFPower Factor Calculator
Calculate power factor, apparent power, reactive power and phase angle from voltage, current and real power for a single-phase circuit.
RLCRLC Impedance Calculator
Calculate XL, XC, net reactance, impedance magnitude and phase angle for a series RLC circuit from R, L, C and frequency.
f₀LC Resonant Frequency Calculator
Calculate resonant frequency, angular frequency and period for an ideal LC circuit from inductance and capacitance with common engineering units.
Np:NsTransformer 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.
A₁v₁Continuity Equation Calculator
Solve second velocity or area for incompressible flow using A₁v₁=A₂v₂, with volumetric flow rate.
P+½ρv²Bernoulli Equation Calculator
Calculate pressure at a second point in ideal flow from pressure, velocity, elevation and density at two points.
F/AHydraulic Press Calculator
Calculate output force from Pascal’s principle using piston force and areas, with ideal pressure and force multiplication ratio.
ΔPPipe Pressure Drop Calculator
Calculate straight-pipe pressure drop and head loss with the Darcy-Weisbach equation from friction factor, length, diameter, density and velocity.
πr⁴ΔPPoiseuille’s Law Calculator
Calculate laminar flow in a circular tube from pressure drop, radius, dynamic viscosity and length, with mean velocity and Reynolds number.
ρgQHPump Power Calculator
Calculate hydraulic power and required shaft power from fluid density, flow rate, pump head and efficiency.
QᵥVenturi Flow Calculator
Calculate flow through a horizontal Venturi meter from inlet/throat diameters, pressure difference, fluid density and discharge coefficient.
ν=μ/ρKinematic Viscosity Calculator
Calculate kinematic viscosity from dynamic viscosity and density, with conversion to centistokes.
Frequently asked questions
Do results replace engineering design?
No. They are calculation aids, not engineering approval or safety review.