Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Cubic feet per minute to US gallons per minute
Convert cfm to gpm instantly, then review the formula, assumptions, and rounding guidance.
Flow rateInstant result
Decimals
Formula result = input × 0.0004719474432 ÷ 0.0000630901964. 1 cfm = 7.4805 gpm
Common examples
One value, several units
Cubic metres per second0.0005 m³/s
Litres per second0.4719 L/s
Litres per minute28.3168 L/min
Cubic metres per hour1.699 m³/h
US gallons per minute7.4805 gpm
Conversion table
| cfm | gpm |
|---|---|
| 1 cfm | 7.4805 gpm |
| 2 cfm | 14.961 gpm |
| 5 cfm | 37.4026 gpm |
| 10 cfm | 74.8052 gpm |
| 25 cfm | 187.013 gpm |
| 50 cfm | 374.026 gpm |
| 100 cfm | 748.0519 gpm |
Conversion chart
1 cfm7.4805 gpm
5 cfm37.4026 gpm
10 cfm74.8052 gpm
25 cfm187.013 gpm
50 cfm374.026 gpm
Worked example
60 litres per minute equals 1 litre per second.
Unit definition
Cubic feet per minute (cfm) One cubic feet per minute equals 0.0004719474432 cubic metre per second.
Unit history
Cubic feet 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 cfm to cubic metre per second.
3. Convert the base value to gpm and apply your display precision.
Understand the result before using it
Cubic feet per minute to US gallons per minute converts a value measured in Cubic feet per minute (cfm) into the equivalent value in US gallons per minute (gpm). 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 × 0.0004719474432 ÷ 0.0000630901964
Assumptions
- Cubic feet per minute and US gallons per minute represent the same flow rate quantity.
- The input is expressed in cfm; the output is expressed in gpm.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 cfm = 7.48051948052 gpm. 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 cfm measurement in a document that expects gpm.
- Compare a cubic feet per minute value with a value reported in us gallons per minute.
- Check the cfm-to-gpm arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse cfm 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 Cubic feet per minute to US gallons per minute?
result = input × 0.0004719474432 ÷ 0.0000630901964 Using the displayed relationship, 1 cfm equals 7.48051948052 gpm.
How many US gallons per minute are in one Cubic feet per minute?
One Cubic feet per minute is 7.48051948052 US gallons per minute. The displayed digits may be rounded.
Can I reverse the cfm to gpm conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts gpm back to cfm.
Is the Cubic feet per minute to US gallons 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.