Density Converter

Convert density between metric and imperial mass-per-volume units.

Convert density units instantly. Free kg/m³, g/cm³, lb/ft³ density converter for science, shipping and materials.

About Density Units

Convert density between metric and imperial mass-per-volume units.

Density is mass per volume, anchored here to kilograms per cubic meter. Water’s 1000 kg/m³ (exactly 1 g/cm³) is the everyday reference: anything denser sinks, anything lighter floats.

Note the US gallon variants — imperial gallons differ, so confirm which gallon a source means before converting fuel or chemical densities. Everything runs in your browser.

Where it is used

Shipping dimensional weight, material specs, chemistry solutions, and buoyancy checks — water at 1000 kg/m³ is the reference.

How to use the Density Units

  1. Value — enter the value (e.g. 1000).
  2. From — enter the value.
  3. To — enter the value.
  4. Calculate — press the Calculate button to see the result instantly above.

Formula

All units anchored to kg/m³ (water = 1000 kg/m³ = 1 g/cm³).

Examples

Example

value:1000
from:kg-m3
to:g-cm3
Result: 1000 kg/m³ = 1 g/cm³

Frequently Asked Questions

Density vs specific gravity?
Specific gravity is density relative to water (unitless). Numerically it equals g/cm³ density — water is 1.0 in both.
Why do US and imperial gallons matter?
A US gallon is 3.785 L; an imperial gallon is 4.546 L. Density per gallon shifts ~20% between them.
Does temperature change density?
Yes for fluids — warm water and fuels expand and lighten. Tables quote a reference temperature (often 15–20 °C) for this reason.
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