Convert CFM per Square Foot to mL/(s·cm²)

Formula

mL/(s·cm²) = ft³/(ft²·min) × 0.508

or mL/(s·cm²) = ft³/(ft²·min) ÷ 1.968503937008

Derivation from SI units:

• 1 ft³/(ft²·min) = 0.3048³ m³ ÷ (0.3048² m² × 60 s) = 0.00508 m/s = 1 ft/min
• 1 mL/(s·cm²) = 10⁻⁶ m³ ÷ (10⁻⁴ m² × 1 s) = 0.01 m/s = 1 cm/s
• 1 ft³/(ft²·min) = 0.00508 m/s ÷ 0.01 m/s per mL/(s·cm²) = 0.508 mL/(s·cm²)

Both units are defined exactly, so the factor is exact. CFM per Square Foot definition: cubic foot per square foot per minute; Milliliter per Second per Square Centimeter definition: milliliter per second per square centimeter.

Worked examples

1. A reading of 25 ft³/(ft²·min) converts to 12.7 mL/(s·cm²).
   25 ft³/(ft²·min) × 0.508 = 12.7 mL/(s·cm²)
2. A value of 100 ft³/(ft²·min) is 50.8 mL/(s·cm²).
   100 ft³/(ft²·min) × 0.508 = 50.8 mL/(s·cm²)

Where it's used

CFM per Square Foot are used for ASTM D737 fabric air permeability (inch-pound reporting), while milliliters per second per square centimeter appear in air permeability of papers and membranes. Both measure face velocity and air permeability (volumetric flow per unit area), so the conversion is a fixed factor.

CFM per Square Foot to other face velocity & air permeability units

Frequently asked questions

Sources

• ASTM D737 Standard Test Method for Air Permeability of Textile Fabrics, ASTM International , inch-pound results in ft³/min/ft².
• 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, "foot per minute".
• ASTM D737 Standard Test Method for Air Permeability of Textile Fabrics, ASTM International , SI results per unit area.
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre).

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