Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
US gallons per minute to Cubic feet per minute Converter
1 gpm ≈ 0.133680555556 cfm. Enter a value to convert gpm to cfm, then use the formula and table below. Displayed digits may be rounded.
Flow rateInstant result
Decimals
Formula result = input × 0.0000630901964 ÷ 0.0004719474432. 1 gpm ≈ 0.1337 cfm
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Cubic metres per second0.0001 m³/s
Litres per second0.0631 L/s
Litres per minute3.7854 L/min
Cubic metres per hour0.2271 m³/h
Cubic feet per minute0.1337 cfm
Conversion table
| gpm | cfm |
|---|---|
| 1 gpm | 0.1337 cfm |
| 2 gpm | 0.2674 cfm |
| 5 gpm | 0.6684 cfm |
| 10 gpm | 1.3368 cfm |
| 25 gpm | 3.342 cfm |
| 50 gpm | 6.684 cfm |
| 100 gpm | 13.3681 cfm |
Conversion chart
1 gpm0.1337 cfm
5 gpm0.6684 cfm
10 gpm1.3368 cfm
25 gpm3.342 cfm
50 gpm6.684 cfm
Worked example
1 gpm ≈ 0.133680555556 cfm. Apply the selected conversion formula to other input values.
Unit definition
US gallons per minute (gpm) One us gallons per minute equals 0.0000630901964 cubic metre per second.
Unit history
US gallons per minute is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert gpm to cubic metre per second.
3. Convert the base value to cfm and apply your display precision.
Understand the result before using it
US gallons per minute to Cubic feet per minute converts a value measured in US gallons per minute (gpm) into the equivalent value in Cubic feet per minute (cfm). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.0000630901964 ÷ 0.0004719474432
Assumptions
- US gallons per minute and Cubic feet per minute represent the same flow rate quantity.
- The input is expressed in gpm; the output is expressed in cfm.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 gpm ≈ 0.133680555556 cfm. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a gpm measurement in a document that expects cfm.
- Compare a us gallons per minute value with a value reported in cubic feet per minute.
- Check the gpm to cfm arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse gpm with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert US gallons per minute to Cubic feet per minute?
result = input × 0.0000630901964 ÷ 0.0004719474432. Input is in gpm; result is in cfm. 1 gpm ≈ 0.133680555556 cfm. The displayed digits may be rounded.
What is 1 gpm in cfm?
1 gpm ≈ 0.133680555556 cfm. The displayed digits may be rounded.
Can I reverse the gpm to cfm conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts cfm back to gpm.
Is the US gallons per minute to Cubic feet per minute result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.