# Density Calculator

URL: https://speedycalculator.com/calculators/physics/density/
Last updated: 2026-10-25

> The density calculator finds density from mass and volume, ρ = m ÷ V, or solves for mass or volume. Results are in kg/m³, g/cm³ and lb/ft³, with a comparison to water.

## Inputs

- Mass (kg, lb, g, oz, st)
- Volume (m³, L, ft³, yd³, US gal)

## Results

- Density
- Specific gravity

## Formula

```
ρ = m ÷ V
```

## Explanation

Density decides whether things float: objects denser than water (1,000 kg/m³) sink.

### How to use the Density Calculator

- **Mass**
- **Volume**
- Want to work backwards? Type a value into **Density** and **Volume** is calculated for you.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Divide mass by volume. Specific gravity compares the density with water at 4 °C.

### Inputs explained

FieldWhat to enterMassUnits: kg, lb, g, oz, stVolumeUnits: m³, L, ft³, yd³, US gal

### What each result means

- **Density** = [Mass] ÷ [Volume]
- **Specific gravity** = [Density] ÷ 1000

### Example values

How the main result changes when **Volume** changes and everything else stays at the example values above:

Volume (m³)Density (kg/m³)0.00055,4000.00083,6000.0012,7000.00132,1600.00151,8000.0021,350

## Worked example

Inputs — Mass: 2.7 kg; Volume: 0.001 m³.

Results — **Density = 2,700 kg/m³**; Specific gravity = 2.7.

## FAQ

**What has a density of 2,700 kg/m³?**
Aluminium.

**Does density change with temperature?**
Yes, most materials expand and become less dense when heated.

**What formula does the Density Calculator use?**
ρ = m ÷ V.

**Can I work backwards from the result?**
Yes. Type the result you want into Density and the calculator finds the matching volume.


## Sources

- [NIST – Fundamental physical constants](https://physics.nist.gov/cuu/Constants/)