Acre-Inch Water Calculator

How much water is one acre inch? Convert acre-inches to litres, cubic metres and gallons. Use the free Acre-Inch Water Calculator below — enter your values and get instant results, right in your browser. 1 acre-inch = 1 acre × 1 inch deep = 102.79 cubic metres = 102,790 litres = 27,154 US gallons.

How to use the Acre-Inch Water Calculator

Irrigation advice talks in acre-inches — one inch of water over one acre — but tubewell bills and tank capacities are in litres and cubic metres, leaving farmers unable to connect the two. One acre-inch is a huge volume: 102,790 litres, enough to fill a 1,000-litre tank more than a hundred times. This acre-inch water calculator converts acre-inches into litres, cubic metres and gallons instantly, so irrigation scheduling, water charges and pump sizing all speak the same language.

  1. Type the number of acre-inches into the amount box.
  2. Confirm Acre-inch is selected in the From dropdown.
  3. Read the Litre result on the big result line.
  4. Switch the To dropdown to Cubic metre or Gallon for other units.

Formula

1 acre-inch = 1 acre × 1 inch deep = 102.79 cubic metres = 102,790 litres = 27,154 US gallons.

Worked example

A 3 acre-inch irrigation on one acre = 308,370 litres of water. If your tubewell delivers 30 litres per second, that irrigation takes about 2.85 hours of pumping. Time one irrigation with a watch and compare it with this figure to check your pump discharge claim.

Frequently asked questions

102,790 litres — one inch of water spread over one acre.

Roughly 16–20 acre-inches per season depending on rainfall and soil, split across 4–5 irrigations.

An acre-inch is a volume; a cusec is a flow rate (cubic feet per second). One cusec flowing for about 12 hours delivers roughly one acre-inch.

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