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How to use
This converter translates mass density between common SI, laboratory and US/imperial units. Each value is normalized through kg/m³, keeping identities such as 1 g/cm³ = 1 g/mL = 1 kg/L = 1000 kg/m³ explicit.
- Enter a non-negative density value.
- Choose the source and target units.
- Calculate to see the selected result plus useful base equivalents.
- Keep the US-gallon definition in mind for lb/gal; the imperial gallon is a different volume.
How it is calculated
Example
Unit example: 1000 kg/m³ = 1 g/cm³ = 1 g/mL = 1 kg/L, and is approximately 62.428 lb/ft³ and 8.3454 lb/US gal.
Important notes
Unit conversion does not determine the density of a material. Real material density can vary with temperature, pressure, composition and moisture. Specific gravity is a dimensionless ratio to a stated reference, so it should not automatically be treated as another density unit.
Worked examples and interpreting results
A material with mass 200 g and volume 100 cm³ has density 2 g/cm³, or 2000 kg/m³. Density relates mass to volume, so conversion must account for both numerator and denominator units.
| Case | Calculation | Result |
|---|---|---|
| Density from mass and volume | 200 ÷ 100 | 2 g/cm³ |
| Conversion to SI units | 2 × 1000 | 2,000 kg/m³ |
How to check the result
Volume must be positive when calculating density. Recover mass as density times volume, or volume as mass divided by density. Density can vary with temperature and pressure; converting units does not correct those conditions.
Frequently asked questions
Can I convert specific gravity to density?
Yes if the reference density is known: density = specific gravity × reference density. Specific gravity itself is dimensionless, so this unit converter does not treat it as a density unit; calculate the density first, then convert that result here.
Are g/cm³ and g/mL the same?
Yes numerically, because 1 mL is exactly 1 cm³.
Why does the converter specify US gallon?
US and imperial gallons have different volumes, so naming the gallon prevents using the wrong factor.
Can density be negative here?
No. This general mass-density converter accepts ordinary non-negative density values.