basic

Stokes' Law Drag Force Calculator

F_d = 6 · π · η · r · v for a small sphere in a viscous fluid.

Compute the viscous drag force on a small sphere moving slowly through a Newtonian fluid (low Reynolds number) using Stokes' law: F_d = 6 · π · η · r · v.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Pa·s
mm
m/s

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

F_d = 6 · π · η · r · v

In depth

Compute the viscous drag force on a small sphere moving slowly through a Newtonian fluid (low Reynolds number) using Stokes' law: F_d = 6 · π · η · r · v.