Irrigation Water Requirement Calculator
Agriculture & FarmingCalculate the total gallons of water needed to irrigate a field to a target depth.
Total Water Needed
Total gallons of water needed (1 acre-inch ≈ 27,154 gallons).
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Odeh Ahwal0people find this calculator helpful
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Agriculture & Farming calculators
Frequently Asked Questions
What is an acre-inch?
An acre-inch is the volume of water needed to cover one acre to a depth of one inch — equal to approximately 27,154 gallons, and a standard unit for planning irrigation water needs.
How much water do crops typically need per week?
It varies significantly by crop type, growth stage, climate, and soil, but many row crops need roughly 1-1.5 inches of water per week during peak growing season, including rainfall.
Does this account for irrigation system efficiency?
No, this calculates the water needed to deliver the target depth to the crop. Less efficient irrigation methods (like flood irrigation) require pumping significantly more total water than the crop actually needs, due to evaporation and runoff losses.
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