CFS to GPM Calculator

Convert Cubic Feet per Second (CFS) to Gallons per Minute (GPM) for accurate water flow calculations in civil engineering, irrigation, and water management.

Water Flow Calculator:

Convert between different water flow rate measurements used in engineering, irrigation, and water management applications.

Flow Rate Converter

Conversion Direction

Water flow rate in selected units

Flow Results

Enter flow rate and click "Convert"

to calculate water flow

CFS to GPM Water Flow Conversion

Water flow rates are measured differently depending on the application and scale. Cubic Feet per Second (CFS) is typically used for large flows like rivers, reservoirs, and major water distribution systems. Gallons per Minute (GPM) is more common for smaller systems like plumbing, irrigation, and residential water supply.

Converting between these units is essential for engineers, contractors, and water management professionals who need to work with different measurement systems and equipment specifications.

Flow Rate Conversion Formulas

The calculator uses standard engineering conversion factors:

CFS to GPM Conversion:
GPM = CFS × 448.831
*Based on 1 cubic foot = 7.48052 gallons × 60 seconds
Reverse Conversion:
CFS = GPM ÷ 448.831
*Converts from gallons per minute to cubic feet per second
Unit Relationships:
1 CFS = 448.831 GPM
1 CFM = 7.48052 GPM
1 m³/s = 15,850.323 GPM

All conversions maintain dimensional consistency and use standard engineering conversion factors.

Water Flow Rate Examples

Here are common water flow conversions used in civil engineering and water management:

Flow Rate (CFS) Equivalent (GPM) Application
0.5 224.4 Garden hose
1.0 448.8 Shower head
2.5 1122.1 Fire hydrant
5.0 2244.2 Small stream
10.0 4488.3 Irrigation ditch
25.0 11220.8 Large pump system
50.0 22441.6 Municipal water main
100.0 44883.1 Major river tributary
3.2 1434.7 Sewage treatment plant
6.8 3048.4 Industrial cooling tower
12.5 5607.9 Flood control channel
18.7 8384.6 Reservoir discharge
0.8 358.7 Bathroom faucet
4.6 2062.7 Sprinkler system main
9.3 4169.0 Storm drain outlet
15.1 6769.3 Hydroelectric intake
22.4 10045.0 Navigation lock
0.3 134.5 Drip irrigation line
7.9 3543.4 Brewery process water
13.8 6187.0 Aqueduct flow
19.6 8789.7 Dam spillway
1.2 538.0 Kitchen sink
5.7 2554.7 Car wash system
11.4 5110.7 Wastewater treatment
16.9 7577.2 Canal irrigation
24.3 10896.7 River diversion
2.1 941.9 Dishwasher
8.6 3855.3 Swimming pool filter
Engineering Tip:

For accurate water system design, always account for pressure losses, pipe friction, and elevation changes in addition to flow rate conversions.