Convert Gallons per minute to Cubic feet per minute
Instantly convert Gallons per minute (GPM) to Cubic feet per minute (CFM) with our free online calculator.
Formula: GPM to CFM — multiply by 0.133681
Reference Table
| Gallons per minute (GPM) | Cubic feet per minute (CFM) |
|---|---|
| 1 | 0.133681 |
| 5 | 0.668403 |
| 10 | 1.33681 |
| 25 | 3.34202 |
| 50 | 6.68403 |
| 100 | 13.3681 |
How to Convert Gallons per minute to Cubic feet per minute
Formula
To convert Gallons per minute (GPM) to Cubic feet per minute (CFM): multiply by 0.133681
Step-by-Step
- Start with your value in Gallons per minute (GPM).
- Multiply by 0.133681 to perform the conversion.
- The result is your value expressed in Cubic feet per minute (CFM).
Conversion Factor
1 GPM = 0.133681 CFM
Reverse Factor
1 CFM = 7.48051 GPM
Worked Example
Convert 25 Gallons per minute to Cubic feet per minute: 25 GPM = 3.34202 CFM
About Gallon per minute (GPM)
A US customary flow-rate unit (US gallons per minute, where 1 US gallon = 3.785411784 liters per NIST SP 811) used universally in US plumbing, HVAC, fire protection, agricultural irrigation, and swimming-pool circulation. GPM is the primary US sizing unit for residential water softeners (the IAPMO Z601 test method rates ion-exchange capacity at a defined GPM), well-pump submersibles, lawn sprinkler design (the GPM at each emitter sets zone sizing), NFPA 13 fire-sprinkler systems (head-flow allocations in GPM), and pool circulation (turnover rates require X GPM × hours). Reference values: a US WaterSense-certified showerhead is ≤ 2.0 GPM, an older US showerhead is 2.5-3 GPM, a residential dishwasher is ~3-4 GPM peak, a 4-inch municipal fire hydrant delivers 500-1,500 GPM (NFPA test pressure 20 psi residual). 1 GPM = 3.7854 L/min = 0.06309 L/s. Care: US GPM ≠ Imperial GPM (a UK gallon is 4.54609 L, so 1 Imperial GPM = 1.201 US GPM).
About Cubic foot per minute (CFM)
An imperial flow-rate unit dominant in US HVAC, dust collection, and compressed-air system engineering. CFM is the working unit for air-handler capacity (ASHRAE 62.1, AMCA 210), residential duct sizing (Manual D ACCA design), bathroom and kitchen exhaust-fan ratings (the Home Ventilation Institute Certified Performance Ratings list each fan model's HVI-tested CFM), compressed-air-system sizing (compressor manufacturer ratings under ISO 1217 are dual-quoted as SCFM and CFM displacement), and dust-collection ducting per OSHA 29 CFR 1910 and NFPA 654. Reference values: a residential bath fan is 50-110 CFM (HVI minimum 50 CFM for code), a central-AC air handler for a 2,000 ft² US home delivers 800-1,200 CFM (1 CFM per ft² is a typical Manual J residential figure), a large industrial centrifugal compressor 5,000-20,000 SCFM. Convert CFM to m³/hr by multiplying by 1.699; to L/s by multiplying by 0.4719; to m³/s by multiplying by 4.7195 × 10⁻⁴.
Quick Facts
- 1 Gallon per minute equals 0.133681 Cubic feet per minute
- 1 Cubic foot per minute equals 7.48051 Gallons per minute
- Gallon per minute is a unit of volumetric flow rate
- Cubic foot per minute is a unit of volumetric flow rate
- This conversion is commonly used in plumbing, HVAC systems, and chemical process engineering
- The Gallon per minute belongs to the imperial system
Common Gallon per minute to Cubic foot per minute Conversions
| Gallons per minute (GPM) | Cubic feet per minute (CFM) |
|---|---|
| 0.01 | 0.00133681 |
| 0.1 | 0.0133681 |
| 0.25 | 0.0334202 |
| 0.5 | 0.0668403 |
| 1 | 0.133681 |
| 2 | 0.267361 |
| 3 | 0.401042 |
| 5 | 0.668403 |
| 10 | 1.33681 |
| 15 | 2.00521 |
| 20 | 2.67361 |
| 25 | 3.34202 |
| 50 | 6.68403 |
| 75 | 10.0261 |
| 100 | 13.3681 |
| 250 | 33.4202 |
| 500 | 66.8403 |
| 1000 | 133.681 |
| 5000 | 668.403 |
| 10000 | 1336.81 |
Understanding Gallons per minute
The Gallon per minute (symbol: GPM) is a unit of volumetric flow rate. A US customary flow-rate unit (US gallons per minute, where 1 US gallon = 3.785411784 liters per NIST SP 811) used universally in US plumbing, HVAC, fire protection, agricultural irrigation, and swimming-pool circulation. GPM is the primary US sizing unit for residential water softeners (the IAPMO Z601 test method rates ion-exchange capacity at a defined GPM), well-pump submersibles, lawn sprinkler design (the GPM at each emitter sets zone sizing), NFPA 13 fire-sprinkler systems (head-flow allocations in GPM), and pool circulation (turnover rates require X GPM × hours). Reference values: a US WaterSense-certified showerhead is ≤ 2.0 GPM, an older US showerhead is 2.5-3 GPM, a residential dishwasher is ~3-4 GPM peak, a 4-inch municipal fire hydrant delivers 500-1,500 GPM (NFPA test pressure 20 psi residual). 1 GPM = 3.7854 L/min = 0.06309 L/s. Care: US GPM ≠ Imperial GPM (a UK gallon is 4.54609 L, so 1 Imperial GPM = 1.201 US GPM).
It belongs to the imperial measurement system.
Gallons per minute are commonly used in plumbing, HVAC systems, and chemical process engineering.
Understanding Cubic feet per minute
The Cubic foot per minute (symbol: CFM) is a unit of volumetric flow rate. An imperial flow-rate unit dominant in US HVAC, dust collection, and compressed-air system engineering. CFM is the working unit for air-handler capacity (ASHRAE 62.1, AMCA 210), residential duct sizing (Manual D ACCA design), bathroom and kitchen exhaust-fan ratings (the Home Ventilation Institute Certified Performance Ratings list each fan model's HVI-tested CFM), compressed-air-system sizing (compressor manufacturer ratings under ISO 1217 are dual-quoted as SCFM and CFM displacement), and dust-collection ducting per OSHA 29 CFR 1910 and NFPA 654. Reference values: a residential bath fan is 50-110 CFM (HVI minimum 50 CFM for code), a central-AC air handler for a 2,000 ft² US home delivers 800-1,200 CFM (1 CFM per ft² is a typical Manual J residential figure), a large industrial centrifugal compressor 5,000-20,000 SCFM. Convert CFM to m³/hr by multiplying by 1.699; to L/s by multiplying by 0.4719; to m³/s by multiplying by 4.7195 × 10⁻⁴.
It belongs to the imperial measurement system.
Cubic feet per minute are commonly used in plumbing, HVAC systems, and chemical process engineering.
Why Convert Gallons per minute to Cubic feet per minute?
Converting between Gallons per minute and Cubic feet per minute is a frequent requirement for engineers, scientists, and students working with volumetric flow rate values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate volumetric flow rate conversion is essential.
Frequently Asked Questions
How do I convert Gallons per minute to Cubic feet per minute?
A US customary flow-rate unit (US gallons per minute, where 1 US gallon = 3. To convert Gallons per minute to Cubic feet per minute, multiply by 0.133681. For example, 25 GPM equals 3.34202 CFM.
How many Cubic feet per minute are in 1 Gallon per minute?
There are 0.133681 Cubic feet per minute in 1 Gallon per minute.
How many Gallons per minute are in 1 Cubic foot per minute?
There are 7.48051 Gallons per minute in 1 Cubic foot per minute.
What is the formula for Gallon per minute to Cubic foot per minute conversion?
The formula is: multiply by 0.133681. This means 1 GPM = 0.133681 CFM.
Is a Gallon per minute bigger than a Cubic foot per minute?
Yes. One Gallon per minute is larger than one Cubic foot per minute because 1 GPM equals 0.133681 CFM, which is less than 1.
When do you need to convert between Gallons per minute and Cubic feet per minute?
An imperial flow-rate unit dominant in US HVAC, dust collection, and compressed-air system engineering. Gallon per minute and Cubic foot per minute are both volumetric flow units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.