Irrigation Zone & Runtime Calculator | LandscapeCalculating.com

Irrigation Zone & Runtime CalculatorHeads per zone from available flow, plus weekly runtime from precipitation rate.Free irrigation zone & runtime calculator with formulas, waste factors, cost estimates and professional guidance.Formula: heads per zone = (available gpm × 0.8) ÷ gpm per head; runtime = (weekly inches ÷ precipitation rate) × 60How to use this calculator

Measure available flow and static pressure at the point of connection before designing.

Design each zone to no more than 80% of available flow.

Group heads by precipitation rate and exposure, never by convenience of pipe routing.

Frequently asked questions

How long should I run my sprinklers?

Apply 1 to 1.25 in per week. At a 1.4 in/hr precipitation rate that is about 54 minutes weekly, split across two or three days.

Why cycle and soak?

Clay soils and slopes accept water slower than heads apply it; two shorter cycles prevent runoff.

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