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How to Convert Cubic Feet Per Second to Acre Feet Per Year

Cubic feet and acre feet both measure volume while seconds and years measure time. When you combine volume per unit of time, such as acre feet per year or cubic feet per second, you get flow rates. To convert between flow rates, you can use a two-step process of first converting the unit of volume and then converting the unit of time, or you can use the conversion factor to go direct from one flow rate to the other.

Calculator

Instructions

- 1
  Divide the number of cubic feet per second by 43,560 to convert to acre feet per second. For example, if you have 50 cubic feet per second, divide 50 by 43,560 to get 0.001147842 acre feet per second.
- 2
  Multiply the number of acre feet per second by 31,536,000, the number of seconds per year, to convert to acre feet per year. In this example, multiply 0.001147842 by 31,536,000 to get 36,198.35 acre feet per year.
- 3
  Multiply the number of cubic feet per second by 723.9669421 to convert directly to acre feet. In this example, multiply 50 by 723.9669421 to confirm your answer of 36198.34711 acre feet per second.

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