What temperature range is supported?

The calculator supports liquid water from 0 °C (32 °F) to 100 °C (212 °F) at atmospheric pressure. Above 100 °C water is steam, and the formula no longer applies.

What formula is used for dynamic viscosity?

The Vogel empirical correlation: ln(μ) = A + B / (C + T), where T is in Kelvin and A, B, C are fitted constants (A = −3.7188, B = 578.919, C = −137.546). This gives results within 1% of IAPWS tabulated values over 0–100 °C.

What is the difference between dynamic and kinematic viscosity?

Dynamic viscosity (μ) measures a fluid's resistance to shear stress and is expressed in mPa·s (or equivalently cP). Kinematic viscosity (ν) is dynamic viscosity divided by fluid density and is expressed in mm²/s (or cSt). Kinematic viscosity is used in Reynolds number calculations.

Why does viscosity decrease as water gets hotter?

Higher temperature gives water molecules more thermal energy, weakening the intermolecular hydrogen bonds that resist flow. As a result, hot water flows more easily (lower viscosity) than cold water.

What units does the tool output?

Dynamic viscosity is shown in mPa·s and centipoise (cP) — they are numerically equal. Kinematic viscosity is shown in mm²/s and centistokes (cSt) — also numerically equal.

Water Viscosity Calculator

Name: Water Viscosity Calculator
Availability: InStock
Author: Nham Vu

Enter a water temperature and instantly get dynamic and kinematic viscosity values using the Vogel and IAPWS empirical formulas.

Temperature Input

Unit:

Temperature

°C

Valid range: 0 °C to 100 °C

Pipe Diameter (optional, for Reynolds number)

Flow Velocity (optional)

m/s

Viscosity Results

Dynamic Viscosity (μ)

—

mPa·s (= cP)

— Pa·s

Kinematic Viscosity (ν)

—

mm²/s (= cSt)

— m²/s

Water Density (ρ)

—

kg/m³

Temperature

—

Reference Table

Temp (°C)	μ (mPa·s)	ν (mm²/s)	ρ (kg/m³)

Summary