Convert Cubic Feet per Minute to SLPM

Formula

SLPM = CFM × 28.316846592

Derivation from SI units:

• 1 CFM = (0.3048 m)³ ÷ 60 s = 4.719474432 × 10⁻⁴ m³/s
• 1 SLPM = 10⁻³ m³ ÷ 60 s, measured at standard reference conditions
• 1 CFM = 0.0004719474432 m³/s ÷ 0.00001666666666667 m³/s per SLPM = 28.316846592 SLPM
• Standard ↔ actual: Q_actual = Q_standard × (T_actual / T_ref) × (P_ref / P_actual), absolute T and P.

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

Worked examples

1. A reading of 100 CFM converts to 2831.684659 SLPM.
   100 CFM × 28.31684659 = 2831.684659 SLPM
2. A value of 800 CFM is 22653.47727 SLPM.
   800 CFM × 28.31684659 = 22653.47727 SLPM

Where it's used

Cubic Feet per Minute are used for US HVAC airflow (about 400 CFM per ton of cooling), while SLPM appear in mass flow meters and controllers. Both measure volumetric flow rate (volume per unit time), so the conversion is a fixed factor.

Cubic Foot per Minute to other flow rate 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, "cubic foot per minute (ft³/min)".
• SEMI E12 Guide for Standard Temperature and Pressure Used in the Measurement of Mass Flow, SEMI , standard conditions 0 °C, 101.325 kPa.
• ISO 6358-1:2013 Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids, International Organization for Standardization .

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