Convert SLPM to Cubic Feet per Minute

Formula

CFM = SLPM × 0.03531466672149

or CFM = SLPM ÷ 28.316846592

Derivation from SI units:

• 1 SLPM = 10⁻³ m³ ÷ 60 s, measured at standard reference conditions
• 1 CFM = (0.3048 m)³ ÷ 60 s = 4.719474432 × 10⁻⁴ m³/s
• 1 SLPM = 0.00001666666666667 m³/s ÷ 0.0004719474432 m³/s per CFM = 0.03531466672149 CFM
• 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. SLPM definition: SLPM; Cubic Foot per Minute definition: cubic foot per minute.

Worked examples

1. A reading of 2 SLPM converts to 0.07062933344 CFM.
   2 SLPM × 0.03531466672 = 0.07062933344 CFM
2. A value of 50 SLPM is 1.765733336 CFM.
   50 SLPM × 0.03531466672 = 1.765733336 CFM

Where it's used

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

SLPM to other flow rate units

Frequently asked questions

Sources

• 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 .
• 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.