Convert Cubic Meters per Second to Gallons per Minute

Formula

GPM = m³/s × 15850.32314149

Derivation from SI units:

• 1 m³/s = 1 m³ ÷ 1 s
• 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s

Both units are defined exactly, so the factor is exact. Cubic Meter per Second definition: cubic meter per second; Gallon per Minute definition: US gallon per minute.

Worked examples

1. A reading of 0.5 m³/s converts to 7925.161571 GPM.
   0.5 m³/s × 15850.32314 = 7925.161571 GPM
2. A value of 10 m³/s is 158503.2314 GPM.
   10 m³/s × 15850.32314 = 158503.2314 GPM

Where it's used

Cubic Meters per Second are used for river and channel discharge, 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.

Cubic Meter per Second 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 2, coherent derived units.
• 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.