Density Converter

Density converter: kg/m³, g/cm³, lb/ft³, and more

A density converter translates mass-per-volume units—kg/m³, g/cm³, lb/ft³, specific gravity style values—so lab notes, shipping specs, and homework share one system. Density connects mass and volume; convert carefully when mixing metric and US customary sheets.

For pure mass or volume alone, use the weight/mass and volume converters instead.

How to use this converter

1. Select the density unit on your sample label or textbook.
2. Enter the value.
3. Pick the target unit your report requires.
4. Copy the result; keep significant figures appropriate to your measurement.

Before and after examples

Familiar density anchors.

What density measures

Density is mass divided by volume. Water near 4 °C is about 1000 kg/m³ or 1 g/cm³—a useful sanity check. Metals, woods, and plastics span wide ranges; always confirm temperature and purity when comparing handbook tables.

Bulk density for powders includes void space and differs from solid (true) density. This tool converts the number you enter; it does not infer packing fraction.

Lab, shipping, and buoyancy

Shipping declarations sometimes list density for liquids. Buoyancy and pressure-head problems need consistent density units before you multiply by gravity or height. Pair with the pressure converter when checking hydrostatic homework.

Specific gravity notes

Specific gravity compares density to a reference (often water). It is dimensionless. If your sheet lists SG, convert via the reference density your standard assumes—do not treat SG as kg/m³ without that step.

Frequently asked questions