# Fluid Momentum Diffusivity Calculator

getcalc.com's **Kinematic Viscosity (ν) Calculator** is an online physics tool to calculate the ratio of dynamic viscosity to unit density of the fluid, in both US customary & metric (SI) units.

## Definition & Formula

**Kinematic Viscosity**, also called the momentum diffusivity, often denoted by a symbol ν, is a measure of physical quantity that represents the dynamic viscosity of a fluid per unit density. It's generally a ratio of dynamic viscosity μ to the density of the fluid ρ.