Water Density Calculator

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Pure water uses the Kell polynomial. Seawater adds salinity and pressure corrections via the Millero method.
Valid range is 0 to 100 C (32 to 212 F / 273 to 373 K) for pure water.
C
Water densityCold water (8-20 C)
998.2041

Density of water at the specified conditions

Density unitkg/m3
Density (kg/m3)998.204kg/m3
Density (g/cm3)0.998204g/cm3
Density (lb/ft3)62.3158lb/ft3
Temperature (C)20C
Specific gravity0.99823
Specific weight9,789.04N/m3
Dynamic viscosity1,001.6649mPa-s
998.204 kg/m3
Hot water (>70 C)<975Warm water975-994Cool water994-999Near-max density999-1001Seawater range1001+

Density at 20.0 C: 998.204 kg/m3

  • Water is densest at about 4 C (999.972 kg/m3) because of hydrogen-bond geometry. Above and below that, density falls.
  • At this temperature, specific gravity is 0.9982, meaning the water is -0.177% less dense than the 4 C reference.
  • Objects with a density below this value will float; objects denser than this value will sink.

Next stepSwitch to seawater mode to see how salinity and depth increase density - key for oceanography and marine engineering.

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