Convert cubic feet per second to other values

Flow rights expressed in cubic feet per second (CFS) are common in older water right claims.  The calculator on this page will convert CFS into the following volume/flow quantities:

• GPS – gallons per second
• GPM – gallons per minute
• GPD – gallons per day
• GPA – gallons per annum
• AFA – acre feet per annum
• MI – miners inches (see the discussion following the calculator, the values differ from state to state)
• CFA – cubit feet per annum

Values used in the calculator.

• 1 CFS = 7.4805 gps
• 1 CFS = 448.83 gpm
• 1 CFS = 646,316.883 gpd
• 1 CFS = 235,905,662 gpa
• 1 CFS = 50 MI *
• 1 CFS = 40 MI *
• 1 CFS = 38.4 MI *
• 1 CFS = 723.97 AFA
• 1 CFS = 31,536,000 CFA

* Different states use different values for miner’s inches.  See the discussion following the calculator.

How to use the calculator.

1. Enter the number of AFA you wish to convert in the top of the form. DO NOT USE COMMAS.
2. Select gpm, CFS, or CFM. (3) Click “Calculate. The converted expression will appear in the last box (conversion). If you selected CFS, the converted figure is an expression in CFS. To recalculate with a different expression (for example, gpm instead of CFS), be sure to select gpm, and click the calculate button again so that the math will reset.

To test the calculator, use 1 CFS. The results will match the formula above.

 Total number of CFS CFS Conversions Expressed in gps (gallons per second) Expressed in gpm (gallons per minute) Expressed in gpd (gallons per day) Expressed in gpa (gallons per annum) Expressed in MI (miners inches @ 50 MI per CFS) Expressed in MI (miners inches @ 40 MI per CFS) Expressed in MI (miners inches @ 38.4 MI per CFS) Express in AFA (acre-feet per annum) Expressed in CFA (cubic feet per annum) Conversion 