Convert Gallons per Minute to sccm

Formula

sccm = GPM × 3785.411784

Derivation from SI units:

• 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
• 1 sccm = 10⁻⁶ m³ ÷ 60 s, measured at standard reference conditions
• 1 GPM = 0.0000630901964 m³/s ÷ 1.666666666667 × 10⁻⁸ m³/s per sccm = 3785.411784 sccm
• 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. Gallon per Minute definition: US gallon per minute; sccm definition: sccm.

Worked examples

1. A reading of 3 GPM converts to 11356.23535 sccm.
   3 GPM × 3785.411784 = 11356.23535 sccm
2. A value of 25 GPM is 94635.2946 sccm.
   25 GPM × 3785.411784 = 94635.2946 sccm

Where it's used

Gallons per Minute are used for pump, well and irrigation ratings, while sccm appear in mass flow controllers in semiconductor, vacuum and coating processes. Both measure volumetric flow rate (volume per unit time), so the conversion is a fixed factor.

Gallon 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, "gallon [U.S.] per minute (gpm)".
• SEMI E12 Guide for Standard Temperature and Pressure Used in the Measurement of Mass Flow, SEMI , standard conditions 0 °C, 101.325 kPa.
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Section 7.5 (reference conditions).

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