Quirkulator

Us Gallons Per Minute to Cubic Feet Per Hour Converter

Convert US gallons per minute to cubic feet per hour with the exact factor 8.02083, plus real reference values in both units.

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Result in cubic feet per hour
Adjust the inputs

Your result updates live as you type.

To convert US gallons per minute to cubic feet per hour, multiply by 8.020833334. That factor is the whole relationship: both units measure volumetric flow, so the conversion is a proportion with no offset and no substance-specific constant.

The US standard for pumps, irrigation and fixtures. Gas appliance and small-flow rating in the US.

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. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in cubic feet per hour, so you can sanity-check whether your answer is a plausible size.

The formula

cubic feet per hour = US gallons per minute × 8.02083333377
US gallons per minute
The amount you are converting, in US gallons per minute
8.02083333377
The exact number of cubic feet per hour in one US gallon per minute
cubic feet per hour
The converted result

How it works, step by step

  1. Enter the value in US gallons per minute.
  2. It is multiplied by 8.02083333377, the exact factor between the two units.
  3. The answer is shown in cubic feet per hour, with the reverse conversion beneath it.
  4. Check the reference table if you want a figure of comparable size.

Worked examples

A bathroom tap: 1.59 GPM in cubic feet per hour

A bathroom tap comes to about 1.59 GPM. Multiplying by the factor: 1.59 × 8.02083 = 12.7531 CFH. Dividing the answer back by 8.02083 returns the figure you started with, which is the quickest way to check you have the factor the right way up.

A garden hose: 4.76 GPM in cubic feet per hour

Take a garden hose, roughly 4.76 GPM. The conversion is a single multiplication — 4.76 × 8.02083 — giving 38.1792 CFH. Because the relationship is proportional, doubling the input doubles the answer to 76.3583 CFH.

How to read your score

0–0ZeroZero US gallons per minute is zero cubic feet per hour.
0–1Under one unitThe answer is less than one cubic foot per hour.
1–1,000Everyday rangeA typical working figure in cubic feet per hour.
1,000–—Large valueLarge enough that the exact figure below the gauge is easier to read than the gauge itself.

Frequently asked questions

How many cubic feet per hour are in one US gallon per minute?

Exactly 8.02083333377. 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 minute to cubic feet per hour?

cubic feet per hour = US gallons per minute × 8.02083333377. Reversed, US gallons per minute = cubic feet per hour ÷ 8.02083333377, which is the same as multiplying by 0.124675324669.

Which is the bigger unit, the US gallon per minute or the cubic foot per hour?

The US gallon per minute. One US gallon per minute equals 8.02083 cubic feet 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 minute?

The US standard for pumps, irrigation and fixtures.

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 GPM to CFH in my head?

Plenty of people do this in their head: multiply by 8 instead of using the exact factor 8.020833334. At 100 that shortcut gives 800 cubic feet per hour, off by 2.083 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 Minute to cubic feet per hour reference tables

Us Gallons Per Minute to cubic feet per hour conversion table
Us Gallons Per MinuteCubic Feet Per Hour
0.5 GPM4.01042 CFH
1 GPM8.02083 CFH
2 GPM16.0417 CFH
3 GPM24.0625 CFH
5 GPM40.1042 CFH
10 GPM80.2083 CFH
20 GPM160.417 CFH
25 GPM200.521 CFH
50 GPM401.042 CFH
75 GPM601.563 CFH
100 GPM802.083 CFH
250 GPM2005.21 CFH
500 GPM4010.42 CFH
1000 GPM8020.83 CFH
5000 GPM40,104.2 CFH

Exact factor: 1 US gallon per minute = 8.02083333377 cubic feet per hour.

Real volumetric flow figures in US gallons per minute and cubic feet per hour
QuantityGPMCFH
A dripping tap0.001585 GPM0.01271 CFH
A bathroom tap1.585 GPM12.71 CFH
A shower head2.536 GPM20.34 CFH
A garden hose4.755 GPM38.14 CFH
A fire hydrant951 GPM7628 CFH
The Thames at London1.03e+06 GPM8.264e+06 CFH

Published reference values, converted with the same factor this page uses.

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Flow Rate Unit Pairs

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