One US gallon per hour is exactly 0.1336805556 cubic feet per hour, so converting US gallons per hour to cubic feet per hour is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
Gas appliance and small-flow rating in the US. Used for fuel burn and small pumps.
Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. Below the calculator there is a step table for the values people look up most, and a second table putting real volumetric flow figures into cubic feet per hour so the number you get has something to be compared against.
The formula
US gallons per hour- The amount you are converting, in US gallons per hour
0.133680555563- The exact number of cubic feet per hour in one US gallon per hour
cubic feet per hour- The converted result
How it works, step by step
- Enter the value in US gallons per hour.
- It is multiplied by 0.133680555563, the exact factor between the two units.
- The answer is shown in cubic feet per hour, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A shower head: 152 GPH in cubic feet per hour
A shower head comes to about 152 GPH. Multiplying by the factor: 152 × 0.133681 = 20.3194 CFH. Dividing the answer back by 0.133681 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A bathroom tap: 95.1 GPH in cubic feet per hour
A bathroom tap comes to about 95.1 GPH. Multiplying by the factor: 95.1 × 0.133681 = 12.713 CFH. Dividing the answer back by 0.133681 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many cubic feet per hour are in one US gallon per hour?
Exactly 0.133680555563. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert US gallons per hour to cubic feet per hour?
cubic feet per hour = US gallons per hour × 0.133680555563. Reversed, US gallons per hour = cubic feet per hour ÷ 0.133680555563, which is the same as multiplying by 7.48051948011.
Which is the bigger unit, the US gallon per hour or the cubic foot per hour?
The cubic foot per hour. One US gallon per hour is only 0.133681 of a cubic foot per hour, so it takes 7.48052 US gallons per hour to make one cubic foot per hour.
What does this quantity actually measure?
Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a US gallon per hour?
Used for fuel burn and small pumps.
What is a cubic foot per hour?
Gas appliance and small-flow rating in the US.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do GPH to CFH in my head?
Plenty of people do this in their head: divide by 7.5 instead of using the exact factor 0.1336805556. At 100 that shortcut gives 13.333333 cubic feet per hour, off by 0.03472 cubic feet per hour or about 0.26%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Hour to cubic feet per hour reference tables
| Us Gallons Per Hour | Cubic Feet Per Hour |
|---|---|
| 0.5 GPH | 0.0668403 CFH |
| 1 GPH | 0.133681 CFH |
| 2 GPH | 0.267361 CFH |
| 3 GPH | 0.401042 CFH |
| 5 GPH | 0.668403 CFH |
| 10 GPH | 1.33681 CFH |
| 20 GPH | 2.67361 CFH |
| 25 GPH | 3.34201 CFH |
| 50 GPH | 6.68403 CFH |
| 75 GPH | 10.026 CFH |
| 100 GPH | 13.3681 CFH |
| 250 GPH | 33.4201 CFH |
| 500 GPH | 66.8403 CFH |
| 1000 GPH | 133.681 CFH |
| 5000 GPH | 668.403 CFH |
Exact factor: 1 US gallon per hour = 0.133680555563 cubic feet per hour.
| Quantity | GPH | CFH |
|---|---|---|
| A dripping tap | 0.0951 GPH | 0.01271 CFH |
| A bathroom tap | 95.1 GPH | 12.71 CFH |
| A shower head | 152.2 GPH | 20.34 CFH |
| A garden hose | 285.3 GPH | 38.14 CFH |
| A fire hydrant | 5.706e+04 GPH | 7628 CFH |
| The Thames at London | 6.182e+07 GPH | 8.264e+06 CFH |
Published reference values, converted with the same factor this page uses.