GPM to GPH Converter
Convert gallons per minute (GPM) to gallons per hour (GPH). There are 60 minutes in an hour, so multiply by 60. The gallon cancels out, so the same factor applies to US and Imperial gallons. GPH is the unit on aquarium pumps, fuel pumps, well yields and drip irrigation; GPM is used for most water pumps and fixtures.
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GPM to GPH conversion resultFree download
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Schedule 40 pipe sizes, water flow in GPM and LPM at four design velocities, and recommended velocities by application. One PDF, made to pin above the bench.
How It Works
GPM and GPH measure the same thing, volume of liquid per unit of time, in the same volume unit. Only the time base differs. Multiplying by 60 converts a per-minute rate to a per-hour rate; there is no rounding and no dependence on which gallon you use.
GPM to GPH Formula
GPH = GPM × 60
One gallon per minute equals 60 gallons per hour, exactly. Going the other way, one gallon per hour equals 0.0166667 gallons per minute.
Worked Example
Converting 5 GPM:
5 × 60 = 300 GPH
GPM to GPH Conversion Table
| GPM | GPH |
|---|---|
| 0.5 GPM | 30 GPH |
| 1 GPM | 60 GPH |
| 2 GPM | 120 GPH |
| 5 GPM | 300 GPH |
| 10 GPM | 600 GPH |
| 25 GPM | 1500 GPH |
| 50 GPM | 3000 GPH |
| 100 GPM | 6000 GPH |
| 500 GPM | 30000 GPH |
Going the other way? Use the GPH to GPM converter. For any other unit pair, the full flow rate converter handles every supported unit.
FAQ
Common questions about converting gallons per minute to gallons per hour.
Frequently Asked Questions
How do I convert GPM to GPH?
Multiply by 60. For example, 5 GPM x 60 = 300 GPH. The factor is exact because it is only a change of time unit.
How many GPH is 1 GPM?
One gallon per minute is 60 gallons per hour. A 10 GPM well pump therefore moves 600 gallons an hour, or 14,400 gallons a day if it ran continuously.
Does it matter whether the gallons are US or Imperial?
No. The gallon is the same on both sides of the conversion, so the factor of 60 applies either way. It only matters when you go on to convert to litres: a US gallon is 3.78541 L, an Imperial gallon 4.54609 L.
What is 2.5 GPM in GPH?
2.5 GPM is 150 GPH. This is a typical US shower head flow, which over a 10-minute shower uses 25 gallons.
How do I convert GPM to gallons per day?
Multiply by 1,440 (60 minutes x 24 hours). 5 GPM is 7,200 gallons per day. The GPM to GPD converter has a full table.
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