Convert Square Feet per Second to Stokes

Formula

St = ft²/s × 929.0304

Derivation from SI units:

• 1 ft²/s = 0.09290304 m²/s (exact)
• 1 St = 1 cm²/s = 10⁻⁴ m²/s
• 1 ft²/s = 0.09290304 m²/s ÷ 0.0001 m²/s per St = 929.0304 St

Both units are defined exactly, so the factor is exact. Square Foot per Second definition: square foot per second; Stokes definition: stokes.

Worked examples

1. A reading of 0.00005 ft²/s converts to 0.04645152 St.
   0.00005 ft²/s × 929.0304 = 0.04645152 St
2. A value of 0.0005 ft²/s is 0.4645152 St.
   0.0005 ft²/s × 929.0304 = 0.4645152 St

Where it's used

Square Feet per Second are used for US hydraulics and pipe-flow calculations, while stokes appear in older physics and fluid-mechanics references. Both measure kinematic viscosity (dynamic viscosity divided by density), so the conversion is a fixed factor.

Square Foot per Second to other kinematic viscosity units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square foot per second (ft²/s)".
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "stokes (St)".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.