GPM to GPH Converter
Enter the flow rate in gpm below to convert it to gph.
Convert GPM (US) to GPH (US)
Enter a value in gpm (us) (GPM) to convert to gph (us) (GPH).
US Gallons per Minute to US Gallons per Hour Conversion Table
Table showing various us gallons per minute measurements converted to gph. Click any preset value or arrow to load it into the converter.
How to Convert GPM to GPH
To convert gpm to gph, multiply the flow rate by the following conversion ratio: 60 gph/us gallons per minute.
Since one us gallons per minute is equal to 60 gph, you can use this simple formula to convert:
The flow rate in gph is equal to the flow rate in gpm multiplied by 60.
For example, here's how to convert 5 gpm to gph using the formula above.
How Many GPH Are in a US Gallons per Minute?
There are 60 gph in a us gallons per minute, which is why we use this value in the formula above.
Our us gallons per minute to us gallons per hour calculator automatically converts your flow rate measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
GPM and gph are both units used to measure flow rate. Keep reading to learn more about each unit.
What Is a US Gallons per Minute?
A us gallons per minute is a unit of flow rate equal to 3.7854118 liters per minute (L/min), the base unit for flow rate. Standard US plumbing & pump flow rate (3.78541 L/min). [1]
The us gallons per minute is classified as a US customary unit of flow rate. GPM can be abbreviated as GPM; for example, 1 us gallons per minute can be written as 1 GPM.
When working with gpm (GPM) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gpm (GPM) are widely used across standard flow rate applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a US Gallons per Hour?
A us gallons per hour is a unit of flow rate equal to 0.0630902 liters per minute (L/min), the base unit for flow rate. Equal to 1/60 GPM (0.06309 L/min). [2]
The us gallons per hour is classified as a US customary unit of flow rate. GPH can be abbreviated as GPH; for example, 1 us gallons per hour can be written as 1 GPH.
When working with gph (GPH) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gph (GPH) are widely used across standard flow rate applications within US customary workflows, engineering documentation, and technical data sheets.
When converting flow rate between gpm (GPM) and gph (GPH), keep full floating-point precision (1 GPM = 60 GPH; 1 GPH = 0.0166667 GPM) during intermediate calculations and round only the final us gallons per hour figure to match your instrument tolerance.
More US Gallons per Minute & US Gallons per Hour Conversions
Need to calculate in the opposite direction? Use our gph (us) to gpm (us) calculator to switch your starting unit immediately. You can also explore related tools such as converting gph (us) to gpm (us), converting liters per hour to gph (us), or converting gpm (us) to liters per minute.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Volume Divided by Time))·Flow Rate Metrology Standard — GPM (US) (GPM) to GPH (US) (GPH)
- [2]NIST OWM SpecificationNIST OWM (SI Units — Volume & Flow Capacity)·Unit Specifications: US Gallons per Minute (GPM) (GPM) & US Gallons per Hour (GPH) (GPH)
- [3]BIPM ReferenceBIPM (Coherent Volumetric Flow Units (m³/s))·Conversion Factors & Mathematical Basis (GPM to GPH)