Density Conversions

Convert density units — kg/m³, g/cm³, lb/ft³. Free calculators for materials science, shipping, and engineering.

8 units · 7 conversions

Density is mass per unit volume — essential for material selection, buoyancy, and converting between weight and volume for bulk goods. SI uses kg/m³; lab work often uses g/cm³; US engineering uses lb/ft³.

Water at room temperature is about 1,000 kg/m³, 1 g/cm³, or 62.4 lb/ft³ — a useful reference when sanity-checking conversions for other materials.

Popular density conversions

Real-world example

A material safety sheet lists aluminum density as 2.7 g/cm³ but your simulation expects kg/m³. Converting gives 2,700 kg/m³ — the value to enter in the model.

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Density units explained

Kilograms per Cubic Meter (kg/m³) · base unit
Also: kg/m3, kilograms per cubic meter
Grams per Cubic Centimeter (g/cm³)
Also: g/cm3, grams per cubic centimeter
Grams per Liter (g/L)
Also: g/l, grams per liter
Pounds per Cubic Foot (lb/ft³)
Also: lb/ft3, lbm/ft3, pounds per cubic foot
Pounds per Cubic Inch (lb/in³)
Also: lb/in3, pounds per cubic inch
Pounds per Cubic Yard (lb/yd³)
Also: lb/yd3, pounds per cubic yard
Ounces per Cubic Inch (oz/in³)
Also: oz/in3, ounces per cubic inch
Milligrams per Cubic Meter (mg/m³)
Also: mg/m3, milligrams per cubic meter

Frequently asked questions

How do I convert g/cm³ to kg/m³?
Multiply by 1,000. Example: 1.03 g/cm³ (seawater) = 1,030 kg/m³.
What is the density of water in lb/ft³?
Fresh water is approximately 62.4 lb/ft³ at room temperature.

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