Free crop water requirement calculator to estimate how much water your crop needs each season.

The Crop Water Requirement Calculator estimates how much irrigation water a crop needs, using evapotranspiration and crop coefficient methods from FAO and USDA. Growers and farm managers can use it to plan irrigation, set realistic water budgets and avoid wasting water or stressing plants. It shows the formula and sources, supports US and metric units, and is free at irrigationcalculators.com.