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PHYSICS / FLUID DYNAMICS

Stokes Drag Force Calculator

Calculate low-Reynolds-number viscous drag on a sphere. See the governing equation, substituted values, result, assumptions, and interpretation in one guided workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

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Calculation path

Calculate low-Reynolds-number viscous drag on a sphere. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

F_d=6pi mu r v

What you provide

What you provide

  • Dynamic viscosity expressed in Pa s, using the same scenario as the other inputs
  • Sphere radius expressed in m, using the same scenario as the other inputs
  • Relative speed expressed in m/s, using the same scenario as the other inputs

What you receive

What you receive

  • Viscous drag force in N from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

The sphere is isolated in creeping incompressible flow with no-slip boundaries and negligible inertia.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors