GPM to GPH Calculator
Convert gallons per minute (GPM) to gallons per hour (GPH) instantly with this flow rate calculator. Ideal for pump sizing, irrigation planning, and water system design, it provides verified flow conversions.
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GPM to GPH Calculator
Calculations are standard physical flow conversions. Real-world plumbing must account for dynamic pipe friction, pipe diameters, and fluid specific gravity.
💡 This calculator converts gallons per minute into gallons per hour for pumps, irrigation systems, water treatment equipment and flow measurement applications.
How to Use GPM to GPH Calculator
Converting volumetric water flow rates from gallons per minute to gallons per hour is simplified with this tool. If you need other conversions, you can check our GPM to CFS Calculator or GPM to LPM Calculator. Sizing fluid mechanics systems, choosing booster pumps, and verifying flow dynamics require accurate conversions. Follow this professional workflow to obtain verified flow results:
- Step 1: Enter the flow value in gallons per minute (GPM) in the numeric input box.
- Step 2: Select your desired decimal precision from the dropdown (default is 2 decimal places).
- Step 3: Click the Calculate button to process the flow conversion.
- Step 4: View the equivalent flow rate in gallons per hour (GPH) displayed in the main output card.
- Step 5: Review the dynamic equivalent hourly flow explanation to verify the total volume delivered.
How to Calculate GPM to GPH
Converting water flow rate values between US gallons per minute (GPM) and gallons per hour (GPH) requires utilizing the exact physical relationship between minutes and hours. This is useful when comparing values against our GPM to PSI Calculator or when calculating horsepower requirements using the GPM to HP Calculator. You can also use our general Flow Rate Calculator to evaluate pipeline velocity. Follow this standard conversion formula:
Where:
- GPH = Volumetric flow rate in gallons per hour
- GPM = Volumetric flow rate in gallons per minute
- 60 = The number of minutes in a standard hour, serving as the constant multiplier
Step-by-Step Practical Example
To demonstrate how this calculation works in practice, let us consider a real-life example of a water pump delivering 25 gallons per minute:
Given:
Flow Rate = 25 GPM
Calculation:
Final Answer:
25 GPM = 1500 GPH
This means that if the water pump operates continuously at a rate of 25 gallons per minute, it will deliver a total volume of 1,500 gallons by the end of one hour.
GPM to GPH Chart
This reference chart displays conversions from gallons per minute (GPM) to gallons per hour (GPH). All values are calculated using the standard flow rate conversion formula GPH = GPM × 60.
| Flow Rate (GPM) | Gallons per Hour (GPH) |
|---|---|
| 1 GPM | 60 GPH |
| 2 GPM | 120 GPH |
| 5 GPM | 300 GPH |
| 10 GPM | 600 GPH |
| 15 GPM | 900 GPH |
| 20 GPM | 1200 GPH |
| 25 GPM | 1500 GPH |
| 30 GPM | 1800 GPH |
| 40 GPM | 2400 GPH |
| 50 GPM | 3000 GPH |
| 75 GPM | 4500 GPH |
| 100 GPM | 6000 GPH |
Note: All calculations in this reference chart are exact. For specific flow rate values not listed here, use the calculator tool above to compute precise hourly metrics.
GPM to GPH Frequently Asked Questions
To convert Gallons per Minute (GPM) to Gallons per Hour (GPH), multiply the flow rate in GPM by 60, since there are exactly 60 minutes in one hour. The formula is: GPH = GPM × 60. For example, a flow rate of 10 GPM is equivalent to 600 GPH.
One Gallon per Minute (GPM) is equal to exactly 60 Gallons per Hour (GPH). This is because flow rate is a measure of volume over time, and multiplying the per-minute rate by 60 minutes yields the total volume that flows in one full hour.
You multiply the flow rate in gallons per minute by 60 because there are exactly 60 minutes in an hour. By multiplying, you scale the volumetric flow from a single minute to a full 60-minute duration, giving you the total gallons discharged over one hour.
GPM measures the volume of fluid passing a point in one minute, which is useful for short-term rate tracking and pump capacity. GPH measures the volume passing in one hour, which is ideal for sizing water storage, estimating daily water usage, and designing irrigation schedules.
Sizing water treatment filtration systems, planning agricultural irrigation cycles, selecting water well pumps, and checking industrial process piping systems frequently require GPM to GPH conversions to match flow rates with daily water capacity limits.
Yes, GPH is highly important for pump sizing, especially in residential wells, water storage systems, and commercial installations. It helps verify that the pump can supply the required total daily or hourly volume of water without depleting the source.