Convert Gallons per Minute to Cubic Meters per Hour
1 US gallon per minute (GPM) equals 0.227124707 cubic meters per hour (m³/h).
1 GPM = 0.227124707 m³/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk US gallon per minute to cubic meter per hour converter to paste a column from Excel.
How to Convert Gallon per Minute to Cubic Meter per Hour
- 1 GPM = 0.227124707 m³/h
- 1 m³/h = 4.402867539 GPM
- Example: convert 15 GPM to m³/h: 15 GPM = 15 × 0.227124707 m³/h = 3.406870606 m³/h
Formula
m³/h = GPM × 0.22712470704
or m³/h = GPM ÷ 4.402867539302
Derivation from SI units:
- 1 GPM = 231 in³ ÷ 60 s = 0.003785411784 m³ ÷ 60 s = 6.30901964 × 10⁻⁵ m³/s
- 1 m³/h = 1 m³ ÷ 3600 s
- 1 GPM = 0.0000630901964 m³/s ÷ 0.0002777777777778 m³/s per m³/h = 0.22712470704 m³/h
Both units are defined exactly, so the factor is exact. Gallon per Minute definition: US gallon per minute; Cubic Meter per Hour definition: cubic meter per hour.
Worked examples
- A 100 GPM chilled-water pump moves 22.7124707 m³/h.
100 GPM × 0.227124707 = 22.7124707 m³/h - A 500 GPM fire pump delivers 113.5623535 m³/h.
500 GPM × 0.227124707 = 113.5623535 m³/h
Gallon per Minute to Cubic Meter per Hour conversion table
| Gallons per Minute (GPM) | Cubic Meters per Hour (m³/h) |
|---|---|
| 0.5 GPM | 0.1135623535 m³/h |
| 1 GPM | 0.227124707 m³/h |
| 1.5 GPM | 0.3406870606 m³/h |
| 1.8 GPM | 0.4088244727 m³/h |
| 2 GPM | 0.4542494141 m³/h |
| 2.5 GPM | 0.5678117676 m³/h |
| 3 GPM | 0.6813741211 m³/h |
| 5 GPM | 1.135623535 m³/h |
| 7.5 GPM | 1.703435303 m³/h |
| 10 GPM | 2.27124707 m³/h |
| 15 GPM | 3.406870606 m³/h |
| 20 GPM | 4.542494141 m³/h |
| 25 GPM | 5.678117676 m³/h |
| 50 GPM | 11.35623535 m³/h |
| 75 GPM | 17.03435303 m³/h |
| 100 GPM | 22.7124707 m³/h |
| 250 GPM | 56.78117676 m³/h |
| 500 GPM | 113.5623535 m³/h |
| 1000 GPM | 227.124707 m³/h |
Where it's used
Pump curves in GPM are converted to m³/h for international projects and metric hydraulic calculations. One GPM is about 0.227 m³/h.
Gallon per Minute to other flow rate units
| Conversion | 1 GPM equals |
|---|---|
| US gallon per minute to cubic meter per second | 0.0000630901964 m³/s |
| US gallon per minute to cubic meter per hour | 0.227124707 m³/h |
| US gallon per minute to liter per second | 0.0630901964 L/s |
| US gallon per minute to liter per minute | 3.785411784 L/min |
| US gallon per minute to cubic centimeter per second | 63.0901964 cm³/s |
| US gallon per minute to cubic centimeter per minute | 3785.411784 cm³/min |
| US gallon per minute to sccm | 3785.411784 sccm |
| US gallon per minute to SLPM | 3.785411784 SLPM |
| US gallon per minute to cubic foot per minute | 0.1336805556 CFM |
Frequently asked questions
How many m³/h is 1 GPM?
1 GPM = 0.227124707 m³/h.
How many cubic meters per hour are in 1 US gallon per minute?
1 GPM = 0.227124707 m³/h.
How do I convert US gallons per minute to cubic meters per hour?
Multiply the value in GPM by 0.227124707, or divide it by 4.402867539. For example, 15 GPM × 0.227124707 = 3.406870606 m³/h.
Is the GPM to m³/h conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (hour) with Table 2 (cubic metre).
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). Convert Gallons per Minute to Cubic Meters per Hour. Retrieved October 17, 2026, from https://scientificconverters.com/flow-rate/gallons-per-minute-to-cubic-meters-per-hour/
IEEE
Scientific Converters, "Convert Gallons per Minute to Cubic Meters per Hour," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/flow-rate/gallons-per-minute-to-cubic-meters-per-hour/