Convert CFM per Square Foot to dm³/(cm²·min)

Formula

dm³/(cm²·min) = ft³/(ft²·min) × 0.03048

or dm³/(cm²·min) = ft³/(ft²·min) ÷ 32.80839895013

Derivation from SI units:

• 1 ft³/(ft²·min) = 0.3048³ m³ ÷ (0.3048² m² × 60 s) = 0.00508 m/s = 1 ft/min
• 1 dm³/(cm²·min) = 10⁻³ m³ ÷ (10⁻⁴ m² × 60 s) = 1/6 m/s ≈ 166.7 mm/s
• 1 ft³/(ft²·min) = 0.00508 m/s ÷ 0.1666666666667 m/s per dm³/(cm²·min) = 0.03048 dm³/(cm²·min)

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

Worked examples

1. A reading of 25 ft³/(ft²·min) converts to 0.762 dm³/(cm²·min).
   25 ft³/(ft²·min) × 0.03048 = 0.762 dm³/(cm²·min)
2. A value of 100 ft³/(ft²·min) is 3.048 dm³/(cm²·min).
   100 ft³/(ft²·min) × 0.03048 = 3.048 dm³/(cm²·min)

Where it's used

CFM per Square Foot are used for ASTM D737 fabric air permeability (inch-pound reporting), while cubic decimeters per square centimeter per minute appear in read-outs on some air permeability testers for open materials. 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".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefixes deci and centi, Table 8 (minute).

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