Water Density Calculator

Find the density of pure water at a given temperature.

Density (kg/m³) 998.2

Formula: Kell's equation (0–150 °C)

Step-by-step with your numbers:

1. Values used:

2. Temperature = 20 °C

4. Density = 998.2kg/m³

Did we solve your problem today?

Water density changes with temperature, peaking near 4 °C.

The math behind it

This uses Kell's empirical equation. Water is densest (~1000 kg/m³) at about 4 °C and lighter when warmer or frozen.

At 20 °C → about 998.2 kg/m³.

Why does ice float?

Ice is less dense than liquid water — an unusual property crucial for aquatic life.