Convert Pound-force Seconds per Square Foot to mPa·s

Formula

mPa·s = lbf·s/ft² × 47880.25898034

Derivation from SI units:

• 1 lbf·s/ft² = 4.4482216152605 N·s ÷ 0.09290304 m² = 47.880258980 Pa·s
• 1 mPa·s = 10⁻³ Pa·s = 1 cP
• 1 lbf·s/ft² = 47.88025898034 Pa·s ÷ 0.001 Pa·s per mPa·s = 47880.25898034 mPa·s

Both units are defined exactly, so the factor is exact. Pound-force Second per Square Foot definition: pound-force second per square foot; Millipascal-second definition: millipascal-second.

Worked examples

1. A reading of 0.0000209 lbf·s/ft² converts to 1.000697413 mPa·s.
   0.0000209 lbf·s/ft² × 47880.25898 = 1.000697413 mPa·s
2. A value of 0.01 lbf·s/ft² is 478.8025898 mPa·s.
   0.01 lbf·s/ft² × 47880.25898 = 478.8025898 mPa·s

Where it's used

Pound-force Seconds per Square Foot are used for US fluid-mechanics textbooks and hydraulics, while millipascal-seconds appear in viscosity of water-like liquids (water ≈ 1 mPa·s at 20 °C). Both measure dynamic (absolute) viscosity, so the conversion is a fixed factor.

Pound-force Second per Square Foot to other dynamic 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, "pound-force second per square foot".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.

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