Water Density Calculator
Estimate ρ(T) for pure water at atmospheric pressure.
How to Use This Calculator
1
Enter temperature
Range 0–100°C; assumes 1 atm and pure water.
2
Calculate density
Result in kg/m³.
Formula
ρ(T) = 1000 · [ 1 − ((T + 288.9414)/(508929.2 (T + 68.12963))) · (T − 3.9863)² ]
T in °C; ρ in kg/m³.
Example: T=20°C ⇒ ρ≈ 998.21 kg/m³.
Frequently Asked Questions
What about salinity or pressure?
This model assumes pure water at ~1 atm. Salinity and pressure require different correlations.
Units?
Temperature in °C, density in kg/m³.