Irrigation Calculator
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Formula
Gallons = Area × Inches × 0.623. Runtime (min) = Gallons ÷ Flow Rate (GPM).
Frequently Asked Questions
How much water does a lawn need per week?
Most lawns need about 1 to 1.5 inches of water per week, including rainfall.
What is a typical sprinkler flow rate?
Residential sprinklers typically deliver 1-5 GPM (gallons per minute) depending on the type and water pressure.