Convert Liters per Minute to Cubic Feet per Minute

Formula

CFM = L/min × 0.03531466672149

or CFM = L/min ÷ 28.316846592

Derivation from SI units:

• 1 L/min = 10⁻³ m³ ÷ 60 s
• 1 CFM = (0.3048 m)³ ÷ 60 s = 4.719474432 × 10⁻⁴ m³/s
• 1 L/min = 0.00001666666666667 m³/s ÷ 0.0004719474432 m³/s per CFM = 0.03531466672149 CFM

Both units are defined exactly, so the factor is exact. Liter per Minute definition: liter per minute; Cubic Foot per Minute definition: cubic foot per minute.

Worked examples

1. A 28.3 L/min particle counter samples about 0.9994050682 CFM.
   28.3 L/min × 0.03531466672 = 0.9994050682 CFM
2. A 100 L/min compressor delivers 3.531466672 CFM.
   100 L/min × 0.03531466672 = 3.531466672 CFM

Where it's used

Metric air-sampler, pump and compressor flows in L/min are converted to CFM for US equipment and for older cleanroom sampling plans (FED-STD-209E) written in cubic feet.

Liter per Minute to other flow rate units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre, minute).
• 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, "cubic foot per minute (ft³/min)".

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