GPM to m³/h Volumetric Flow Rate Conversion Chart
| Gallon per minute (US) (gpm) | Cubic meter per hour (m3/h) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 1 gpm | 0.23 m3/h | Residential Undersink Drinking Water Filtration Loop | 1 × 0.227125 = 0.227 m³/h |
| 2 gpm | 0.45 m3/h | Domestic Water Treatment Carbon Filter Rinse Flow | 2 × 0.227125 = 0.454 m³/h |
| 5 gpm | 1.14 m3/h | Single Family Residential Water Supply Peak Flow | 5 × 0.227125 = 1.14 m³/h |
| 10 gpm | 2.27 m3/h | Residential Geothermal Heat Pump Ground Loop Circulation | 10 × 0.227125 = 2.27 m³/h |
| 15 gpm | 3.41 m3/h | Commercial Automatic Car Wash Spot-Free Rinse Header | 15 × 0.227125 = 3.41 m³/h |
| 20 gpm | 4.54 m3/h | Commercial Swimming Pool Sand Filter Turnover Pump | 20 × 0.227125 = 4.54 m³/h |
| 25 gpm | 5.68 m3/h | Commercial HVAC Hydronic Heating Water Distribution Loop | 25 × 0.227125 = 5.68 m³/h |
| 50 gpm | 11.36 m3/h | Industrial Food Processing Clean-in-Place Spray Header | 50 × 0.227125 = 11.36 m³/h |
| 75 gpm | 17.03 m3/h | Agricultural Greenhouse Micro-Sprinkler Irrigation Main | 75 × 0.227125 = 17.03 m³/h |
| 100 gpm | 22.71 m3/h | Industrial Liquid Chiller Condenser Water Circulation Pump | 100 × 0.227125 = 22.71 m³/h |
| 150 gpm | 34.07 m3/h | Petrochemical Chemical Transfer and Dosing Line Pump | 150 × 0.227125 = 34.07 m³/h |
| 250 gpm | 56.78 m3/h | Commercial Building Automatic Fire Sprinkler System Demand | 250 × 0.227125 = 56.78 m³/h |
| 500 gpm | 113.56 m3/h | Municipal Potable Water Supply Booster Station Pump | 500 × 0.227125 = 113.56 m³/h |
| 1000 gpm | 227.12 m3/h | Wastewater Treatment Plant Activated Sludge Recirculation | 1000 × 0.227125 = 227.12 m³/h |
| 2500 gpm | 567.81 m3/h | Regional Stormwater Flood Control Drainage Channel Station | 2500 × 0.227125 = 567.81 m³/h |
Gallon per minute (US) to Cubic meter per hour Formula & Unit Definitions
The conversion factor derives from the definition of the US liquid gallon (0.003785411784 m³) multiplied by the 60 minutes in an hour (0.003785411784 × 60 = 0.22712470704 m³/h). Rounding to six decimal places gives 0.227125. Multiplying any flow rate in US gallons per minute by 0.227125 computes the exact discharge rate in cubic meters per hour.
Quick Estimation: Quick mental shortcut: To convert GPM to m³/h in your head, divide the GPM by 4.4 (or divide by 10 and multiply by 2.27). For example, 44 GPM ÷ 4.4 = 10 m³/h (exact: 9.99 m³/h); 100 GPM gives 10 × 2.27 = 22.7 m³/h (exact: 22.71 m³/h).
Gallon per minute — GPM
US Customary Flow- Standard US engineering unit for liquid discharge (1 GPM = 231 cubic inches per minute)
- Primary rating metric for North American commercial HVAC, fire protection, and plumbing
- Equal to approximately 0.227125 cubic meters per hour (based on the US liquid gallon)
Cubic meter per hour — m³/h
SI Industrial Metric- Standard international metric unit for bulk volumetric flow (1 m³/h = 1,000 liters per hour)
- Universal benchmark for European DIN/ISO pump curves, municipal utilities, and water treatment
- Equivalent to approximately 4.402868 US gallons per minute
Frequently Asked Questions
Q.How do you convert GPM to cubic meters per hour accurately?
Multiply the flow rate in gallons per minute by 0.227125 (or divide by 4.402868). For example, 100 GPM × 0.227125 = 22.71 m³/h.
Q.What is the reverse conversion from cubic meters per hour to GPM?
To convert back, use the Cubic Meters per Hour to GPM Converter where 1 m³/h equals approximately 4.402868 GPM.
Q.Why do international pump manufacturers rate equipment in m³/h instead of GPM?
Cubic meters per hour is the standard international metric unit for bulk fluid delivery, adhering to ISO and European industrial pump standards.
Q.What is 250 GPM in m³/h for commercial fire sprinklers?
250 gallons per minute equals approximately 56.78 cubic meters per hour (m³/h).