The Home Almanac

Vol. I, MMXXVIThe American home, in season.Across all fifty states

Irrigation Calculator

Use a simple weekly inch target or ET mode with crop coefficient, effective rainfall, irrigation efficiency, and flow rate.

Volume Area

How this estimate works

Irrigation math follows the FAO-56 crop-evapotranspiration method, at 27,154 US gallons per acre-inch.

Planning estimate only. Local extension, soil lab, veterinary, apiary, and label guidance should override a calculator.

Drip Irrigation Run-TimeHow long and how often to run drip for an inch a week, scaled to your heat.Rain Barrel & Water CaptureGallons a roof catches from a given rain, barrels to hold it, and when to drain.Livestock Water CalculatorDaily water needs for mixed livestock groups, with hot-weather reserves.Weather & Work WindowsYour local forecast with the right days flagged for outdoor jobs.