Convert flow rate units — m³/s, L/s, L/min, ft³/s, gallon/min and more.
| Unit | Name | Value |
|---|---|---|
| m³/s | Cubic Meter/Second | 0.00006309 |
| m³/min | Cubic Meter/Minute | 0.0037853243 |
| m³/h | Cubic Meter/Hour | 0.22694245 |
| L/s | Liter/Second | 0.06309 |
| L/min | Liter/Minute | 3.7853243 |
| ft³/s | Cubic Foot/Second | 0.0022279903 |
| ft³/min | Cubic Foot/Minute | 0.13366525 |
| gal/h | Gallon/Hour (US) | 60 |
Formula: CFM = GPM × 0.1337
Multiply any GPM value by 0.1337 to get CFM.
Reverse: GPM = CFM × 7.481
Common flow rate values — factor: 1 GPM = 0.1337 CFM
| GPM (GPM) | CFM (CFM) | Context |
|---|---|---|
| 0.01 GPM | 0.001337 CFM | Drip |
| 0.1 GPM | 0.01337 CFM | Slow drip |
| 1 GPM | 0.1337 CFM | 1 GPM |
| 5 GPM | 0.6684 CFM | Residential pump |
| 10 GPM | 1.337 CFM | Garden irrigation |
| 15 GPM | 2.005 CFM | Home well pump |
| 100 GPM | 13.37 CFM | Light commercial |
| 500 GPM | 66.84 CFM | Fire hydrant small |
| 1000 GPM | 133.7 CFM | Fire hydrant |
| 5000 GPM | 668.4 CFM | Large system |
| 1e+04 GPM | 1337 CFM | Municipal pump |
| 5e+04 GPM | 6684 CFM | Large plant |
| 1e+05 GPM | 1.337e+04 CFM | Very large |
| 1e+06 GPM | 1.337e+05 CFM | Extreme |
| 1e+07 GPM | 1.337e+06 CFM | Max |
1 GPM = 0.1337 CFM.
m³/s × 1000 = L/s × 60 = L/min. Use this chain for quick conversions.
Multiply result by 7.481 to recover the original GPM value.
Designs pumps, pipes, and water distribution systems with flow rates in m³/s, L/s, and GPM.
Specifies air handling units and ductwork in CFM (ft³/min) and m³/h for North American and European projects.
Monitors and controls treatment processes with flow rates in m³/h, L/s, and MGD.
Designs sprinkler systems with required flows in GPM and L/min per NFPA standards.
Measures river and groundwater flows in m³/s (m) and ft³/s (cfs) for flood modeling and water resource planning.
Configures ventilators and oxygen delivery systems with flow rates specified in L/min.
Gallons per minute (GPM) is the standard flow unit for pumps, plumbing, fire suppression, and irrigation systems in the United States. One US GPM = 6.309 × 10⁻⁵ m³/s = 3.785 L/min.
US pump specifications universally use GPM: a residential well pump delivers 5–20 GPM; a fire suppression sprinkler system requires 7–26 GPM per head; a municipal fire hydrant delivers 500–1,500 GPM. Fuel transfer pumps at gas stations operate at 10–15 GPM.
Interesting fact: The US uses about 345 billion gallons of freshwater per day — approximately 240 million GPM. Of this, about 41% goes to thermoelectric power plant cooling, 37% to irrigation, and 13% to public water supplies.
Cubic feet per minute (CFM) is the dominant airflow unit in North American HVAC, ventilation, and pneumatic systems. One CFM = 0.000472 m³/s = 28.32 L/min.
HVAC systems in the US are universally specified in CFM: a typical bedroom requires 50–100 CFM of ventilation; a commercial kitchen exhaust hood needs 300–1,500 CFM; a large data center cooling system may require 100,000+ CFM.
Interesting fact: The term CFM is so entrenched in US building practice that even metric-preferring engineers typically specify airflows in CFM for North American projects. Air compressors are rated in CFM at a specified pressure (e.g., '10 CFM @ 90 psi').
Converting GPM to CFM is essential across hydraulic engineering, HVAC, water treatment, fire protection, and medicine. SI units (m³/s, L/s) are standard in science; European engineering uses m³/h; US systems use GPM and CFM; medical applications use L/min.
Quick reference: 10 GPM = 1.337 CFM. Reverse: 1 CFM = 7.481 GPM. Factor: 1 GPM = 0.1337 CFM.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.