What is the density formula?

Density is mass divided by volume, ρ = m ÷ V. With mass in grams and volume in cubic centimetres, the result is in grams per cubic centimetre (g/cm³).

How do I find mass or volume from density?

Rearrange the formula: mass = density × volume (m = ρV), and volume = mass ÷ density (V = m ÷ ρ). Select what you want to solve for and the calculator applies the right version automatically.

How do I convert g/cm³ to kg/m³?

Multiply by 1000. For example, 1 g/cm³ equals 1000 kg/m³, which is the density of pure water.

What is the density of water?

Pure water is about 1 g/cm³ (1000 kg/m³) at 4 °C. It is the standard reference, so a substance with density above 1 g/cm³ sinks in water and one below it floats.

Why does an object float or sink?

An object floats if its average density is less than the fluid it sits in, and sinks if it is denser. That is why ice (about 0.92 g/cm³) floats on water while a steel bolt sinks.

Density Calculator — Gera Tools

Q: Is my data sent anywhere?

No. Every calculation runs locally in your browser with no uploads.

Density calculator

Density measures how much mass is packed into a given volume — the relationship ρ = m ÷ V. This tool rearranges the formula so you can solve for density, mass or volume, useful for science homework, material selection and any buoyancy or weight estimate.

How it works

Starting from the definition density = mass ÷ volume, the calculator solves for whichever quantity you choose:

Solve for	Formula
Density (ρ)	ρ = m ÷ V
Mass (m)	m = ρ × V
Volume (V)	V = m ÷ ρ

Enter the two values you know in grams and cubic centimetres, and the result comes out in g/cm³ (or g, or cm³). To convert g/cm³ to kg/m³, multiply by 1000.

Example

A metal block with a mass of 1000 g and a volume of 500 cm³:

ρ = 1000 ÷ 500 = 2 g/cm³

That is twice the density of water (1 g/cm³), so the block sinks. Reversing it, a substance of 2 g/cm³ occupying 500 cm³ has a mass of 2 × 500 = 1000 g.

Every calculation runs locally in your browser with no uploads.