Density Unit Conversion Calculator

Enter Calculation

Density

Unit Gram per cubic metre (g/m^3) Gram per cubic millimetre (g/mm^3) Gram per cubic centimetre (g/cm^3) Kilogram per cubic metre (kg/m^3) Kilogram per cubic millimetre (kg/mm^3) Kilogram per cubic centimetre (kg/cm^3) Metric tonne per cubic metre (t/m^3) Metric tonne per cubic millimetre (t/mm^3) Metric tonne per cubic centimetre (t/cm^3) Gram per litre (g/L) Gram per millilitre (g/mL) Pound per cubic foot (lb/ft^3) Pound per cubic inch (lb/in^3) Pound per US liquid gallon (lb/gal US) Pound per UK gallon (lb/gal UK)

Display digits 6 10 14 18 22 26 30 34 38 42 46 50

Results

Density in kilograms per cubic metre (SI base)

1 kg/m^3

Unit	Value
Gram per cubic metre (g/m^3)	1,000
Gram per cubic millimetre (g/mm^3)	0.000001
Gram per cubic centimetre (g/cm^3)	0.001
Kilogram per cubic metre (kg/m^3)	1
Kilogram per cubic millimetre (kg/mm^3)	0.000000001
Kilogram per cubic centimetre (kg/cm^3)	0.000001
Metric tonne per cubic metre (t/m^3)	0.001
Metric tonne per cubic millimetre (t/mm^3)	0.000000000001
Metric tonne per cubic centimetre (t/cm^3)	0.000000001
Gram per litre (g/L)	1
Gram per millilitre (g/mL)	0.001
Pound per cubic foot (lb/ft^3)	0.06242796057615
Pound per cubic inch (lb/in^3)	0.000036127292000084
Pound per US liquid gallon (lb/gal US)	0.0083454044520193
Pound per UK gallon (lb/gal UK)	0.0100224128549607

What is the Density Unit Conversion Calculator?

This tool converts a single density value into 15 commonly used density units at the same time. Density is mass per unit volume, and it appears in countless metric and imperial units depending on the field of work. Whether you have a value in grams per cubic centimetre, kilograms per cubic metre, metric tonnes per cubic metre, or pounds per cubic foot, this calculator shows every equivalent instantly. It is a pure physics/units tool and works identically everywhere in the world.

Density is how much mass fits into a unit of volume.

How to use it

Enter your density value, choose the unit that the value is expressed in from the dropdown, and pick how many display digits you want. The results table then lists the same value expressed in all 15 supported units. The "Display digits" option only changes the precision shown; it never alters the underlying math.

The formula explained

Every unit has a fixed factor that converts it to the SI base unit, kilogram per cubic metre (\(\text{kg/m}^3\)). First the entered value is normalized to SI: \(\rho_{\text{SI}} = \text{value} \times f_{in}\). Then it is converted to each target unit by dividing by that unit's factor: \(\text{out} = \rho_{\text{SI}} / f_{out}\). Combined, the direct conversion is \(\text{out} = \text{value} \times f_{in} / f_{out}\). Because the factors are fixed nonzero constants, there is never a division by your input, so a value of zero simply produces zero everywhere.

$$\text{Output} = \text{Density} \times \frac{f_{\text{Input Unit}}}{f_{\text{Output Unit}}}$$

Each unit is converted via a shared SI base (kg per cubic meter).

Worked example

Suppose you enter 1 \(\text{kg/m}^3\). The SI value is 1. Converting: grams per cubic metre = \(1 / 0.001 = 1000\); grams per cubic centimetre = \(1 / 1000 = 0.001\); pounds per cubic foot = \(1 / 16.0184\ldots = 0.06243\). For water at 1000 \(\text{kg/m}^3\) the calculator returns 1 \(\text{g/cm}^3\) and about 62.43 \(\text{lb/ft}^3\), both of which match the known density of water.

FAQ

Which "tonne" is used? The metric tonne (1000 kg), not the US or UK ton.

Which gallon? Both are supported: the US liquid gallon (3.785411784 L) and the UK imperial gallon (4.54609 L).

Does the display-digits setting affect accuracy? No. The computation always uses full double precision; the setting only controls how many digits are shown.