Volumetric flow rate.
Cubic foot per Seconds to Gallon per Seconds Converter — ft3/s to gal/s
Convert Cubic foot per Seconds (ft3/s) to Gallon per Seconds (gal/s) using the exact conversion factor (1 cubic foot per seconds = 7.480519481 gallon per seconds). See the formula, worked examples, conversion table, and common uses.
Cubic foot per Seconds to Gallon per Seconds converter
Converter
Flow Rate Converter
Convert volumetric flow rates across metric, US, imperial, industrial, and scientific units.
Context values
Some unit families need one extra value for a physically accurate result.
Volumetric flow rate.
Result = input x 0.02831684659 / 0.003785411784.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic foot per Seconds to Gallon per Seconds
Cubic foot per Seconds and Gallon per Seconds both measure volumetric flow rate — how much volume passes a point over time — used to size pipes and pumps, monitor river or stream discharge, control industrial processes, and set medical infusion rates. Cubic foot per Seconds is most often used for the standard unit used by the us geological survey for reporting river and stream discharge at gauging stations.
Formula
gallon per seconds = cubic foot per seconds × 7.48051948052
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic foot per seconds equals 0.028316846592 base units, and 1 gallon per seconds equals 0.003785411784 base units, so dividing one by the other gives the direct cubic foot per seconds-to-gallon per seconds factor of 7.48051948052.
Simple example
1 ft3/s × 7.480519481 = 7.480519481 gal/s
1 cubic foot per seconds = 7.480519481 gallon per seconds.
Real-world example
60 ft3/s × 7.480519481 = 448.8311688 gal/s
60 cubic foot per seconds = 448.8311688 gallon per seconds.
Conversion table
| Cubic foot per Seconds (ft3/s) | Gallon per Seconds (gal/s) |
|---|---|
| 0.1 ft3/s | 0.7480519481 gal/s |
| 1 ft3/s | 7.480519481 gal/s |
| 10 ft3/s | 74.80519481 gal/s |
| 60 ft3/s | 448.8311688 gal/s |
| 100 ft3/s | 748.0519481 gal/s |
| 1,000 ft3/s | 7,480.519481 gal/s |
Reverse conversion: Gallon per Seconds to Cubic foot per Seconds
7.480519481 gal/s × 0.1336805556 = 1 ft3/s
7.480519481 gallon per seconds = 1 cubic foot per seconds.
cubic foot per seconds = gallon per seconds × 0.133680555556
For a page dedicated to this direction, see Gallon per Seconds to Cubic foot per Seconds.
Understanding the Cubic foot per Seconds
Cubic foot per Seconds (ft3/s) measures volumetric flow rate. One cubic foot of volume passing a point every second. It is classified as a US customary flow-rate unit.
Where it's used: United States
Uses of the Cubic foot per Seconds today
- The standard unit used by the US Geological Survey for reporting river and stream discharge at gauging stations
Understanding the Gallon per Seconds (gal/s)
Volumetric flow rate.
Cubic foot per Seconds — sources
- USGS Water Science School — Cubic feet per second (cfs) is the standard unit USGS uses to report streamflow.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gallon per seconds are in 1 cubic foot per seconds?
1 cubic foot per seconds equals 7.480519481 gallon per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert cubic foot per seconds to gallon per seconds?
Multiply the cubic foot per seconds value by 7.480519481. The converter above does this instantly to whatever precision you set.
How do I convert gallon per seconds back to cubic foot per seconds?
Use the reverse factor: 1 gallon per seconds equals 0.1336805556 cubic foot per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic foot per seconds?
Cubic foot per Seconds (ft3/s) measures volumetric flow rate. One cubic foot of volume passing a point every second. It is classified as a US customary flow-rate unit.
What is a gallon per seconds?
Gallon per Seconds (gal/s) is a unit of flow rate.
Is the cubic foot per seconds to gallon per seconds conversion exact?
Yes. Both cubic foot per seconds and gallon per seconds are defined by fixed standards rather than physical artifacts, so the factor of 7.480519481 used above is exact to as many digits as you choose to display.
Where is the cubic foot per seconds still used today?
United States
What's the difference between volumetric and mass flow rate?
Volumetric flow rate measures the volume of fluid passing a point per unit time (for example, liters per second). Mass flow rate measures the mass instead. For a fluid of constant density the two are directly proportional, but for compressible fluids like gases, mass flow is often the more meaningful quantity.