Gallon per Minute (GPM)
The US gallon per minute (GPM) is a flow of one US liquid gallon (231 in³) each minute, exactly 6.30901964 × 10⁻⁵ m³/s (about 3.785 L/min).
Symbol: GPM
Quantity: volumetric flow rate (volume per unit time)
SI relation: 1 GPM = 0.0000630901964 m³/s (exact)
Derivation: 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
Exact: yes, by definition
Typical uses
- Pump, well and irrigation ratings
- Plumbing fixtures (US shower heads ≤ 2.5 GPM)
- Chilled- and hot-water loops (≈ 2.4 GPM per ton at 10 °F ΔT)
Convert US gallons per minute to other units
| Conversion | 1 GPM equals | Reverse |
|---|---|---|
| US gallon per minute to cubic meter per hour | 0.227124707 m³/h | cubic meter per hour to US gallon per minute |
| US gallon per minute to liter per second | 0.0630901964 L/s | liter per second to US gallon per minute |
| US gallon per minute to liter per minute | 3.785411784 L/min | liter per minute to US gallon per minute |
| US gallon per minute to cubic foot per minute | 0.1336805556 CFM | cubic foot per minute to US gallon per minute |
| US gallon per minute to cubic meter per second | 0.0000630901964 m³/s | cubic meter per second to US gallon per minute |
| US gallon per minute to cubic centimeter per minute | 3785.411784 cm³/min | cubic centimeter per minute to US gallon per minute |
| US gallon per minute to sccm | 3785.411784 sccm | sccm to US gallon per minute |
| US gallon per minute to SLPM | 3.785411784 SLPM | SLPM to US gallon per minute |
| US gallon per minute to cubic centimeter per second | 63.0901964 cm³/s | cubic centimeter per second to US gallon per minute |
Open the Flow Rate Converter to convert any value between all units.
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)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Gallon per Minute (GPM). Retrieved October 17, 2026, from https://scientificconverters.com/units/us-gallon-per-minute/
IEEE
Scientific Converters, "Gallon per Minute (GPM)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/us-gallon-per-minute/