Convert cm³/(s·cm²) to CFM per Square Foot

Formula

ft³/(ft²·min) = cm³/(s·cm²) × 1.968503937008

Derivation from SI units:

• 1 cm³/(s·cm²) = 10⁻⁶ m³ ÷ (10⁻⁴ m² × 1 s) = 0.01 m/s = 1 cm/s
• 1 ft³/(ft²·min) = 0.3048³ m³ ÷ (0.3048² m² × 60 s) = 0.00508 m/s = 1 ft/min
• 1 cm³/(s·cm²) = 0.01 m/s ÷ 0.00508 m/s per ft³/(ft²·min) = 1.968503937008 ft³/(ft²·min)

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

Worked examples

1. 10 cm³/(s·cm²) is 19.68503937 ft³/(ft²·min).
   10 cm³/(s·cm²) × 1.968503937 = 19.68503937 ft³/(ft²·min)
2. A fabric at 25 cm³/(s·cm²) is 49.21259843 ft³/(ft²·min).
   25 cm³/(s·cm²) × 1.968503937 = 49.21259843 ft³/(ft²·min)

Where it's used

SI ASTM D737 results in cm³/(s·cm²) are converted to CFM/ft² for US specifications and Frazier-based requirements.

Cubic Centimeter per Second per Square Centimeter to other face velocity & air permeability units

Frequently asked questions

Sources

• ASTM D737 Standard Test Method for Air Permeability of Textile Fabrics, ASTM International , SI results in cm³/s/cm².
• 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".

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