Water Viscosity Calculator

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Choose the temperature unit for both input and displayed results.
Temperature of the water. Valid range for liquid water at 1 atm: 0-100 °C (32-212 °F). Above 100 °C requires pressurized conditions; the calculator covers up to 370 °C (698 °F).
°C
Select the preferred output unit for viscosity. 1 mPa·s = 1 cP. Kinematic viscosity in cSt = mm²/s.
Dynamic viscosityAmbient / warm
1.0016mPa·s

Resistance to shear flow (also called absolute viscosity)

Kinematic viscosity1.0034mm²/s
Water density0.9982kg/L
Dynamic viscosity (Pa·s)0.001002Pa·s
Temperature (°C)20°C
1.0016 mPa·s
Very low (hot)<0.3Low (60-100 °C)0.3-0.55Moderate (30-60)0.55-0.9Normal (10-30 °C)0.9-1.3High (near 0 °C)1.3+

Dynamic viscosity at 20.0 °C is 1.0016 mPa·s.

  • Kinematic viscosity is 1.0034 mm²/s. This is the value used in Reynolds number and pipe flow calculations.
  • Water density at this temperature is 0.9982 kg/L (998.2 kg/m³).

Next stepUse dynamic viscosity in Hagen-Poiseuille flow, Reynolds number, or pipe pressure-drop calculations. Use kinematic viscosity for Stokes settling or diffusivity estimates.

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