Convert Cubic Meters per Hour to Gallons per Minute

Formula

GPM = m³/h × 4.402867539302

Derivation from SI units:

• 1 m³/h = 1 m³ ÷ 3600 s
• 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
• 1 m³/h = 0.0002777777777778 m³/s ÷ 0.0000630901964 m³/s per GPM = 4.402867539302 GPM

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

Worked examples

1. A 10 m³/h circulation pump delivers 44.02867539 GPM.
   10 m³/h × 4.402867539 = 44.02867539 GPM
2. A 50 m³/h cooling-tower flow is 220.143377 GPM.
   50 m³/h × 4.402867539 = 220.143377 GPM

Where it's used

Metric pump and process flows in m³/h are converted to GPM when specifying US pumps, valves and meters.

Cubic Meter per Hour 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 8 (hour) with Table 2 (cubic metre).
• 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.