Convert SLPM to Gallons per Minute

Formula

GPM = SLPM × 0.2641720523581

or GPM = SLPM ÷ 3.785411784

Derivation from SI units:

• 1 SLPM = 10⁻³ m³ ÷ 60 s, measured at standard reference conditions
• 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
• 1 SLPM = 0.00001666666666667 m³/s ÷ 0.0000630901964 m³/s per GPM = 0.2641720523581 GPM
• 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; Gallon per Minute definition: US gallon per minute.

Worked examples

1. A reading of 2 SLPM converts to 0.5283441047 GPM.
   2 SLPM × 0.2641720524 = 0.5283441047 GPM
2. A value of 50 SLPM is 13.20860262 GPM.
   50 SLPM × 0.2641720524 = 13.20860262 GPM

Where it's used

SLPM are used for mass flow meters and controllers, while US gallons per minute appear in pump, well and irrigation ratings. 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, "gallon [U.S.] per minute (gpm)".

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