Convert Stokes to Square Feet per Second

Formula

ft²/s = St × 0.001076391041671

or ft²/s = St ÷ 929.0304

Derivation from SI units:

• 1 St = 1 cm²/s = 10⁻⁴ m²/s
• 1 ft²/s = 0.09290304 m²/s (exact)
• 1 St = 0.0001 m²/s ÷ 0.09290304 m²/s per ft²/s = 0.001076391041671 ft²/s

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

Worked examples

1. A reading of 0.5 St converts to 0.0005381955208 ft²/s.
   0.5 St × 0.001076391042 = 0.0005381955208 ft²/s
2. A value of 5 St is 0.005381955208 ft²/s.
   5 St × 0.001076391042 = 0.005381955208 ft²/s

Where it's used

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

Stokes 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, "stokes (St)".
• 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)".

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