Irrigation Runtime Calculator
Turn inches per week into minutes per zone. Use your system’s precipitation rate (in/hr). No rate? Use the “Catch-Cup Helper” below to measure it once, then compute weekly runtime and cycle-and-soak splits.
Recommended runtime
Enter target water, precip rate, cycles, and days/week.
Formula: minutes/week = (target inches ÷ inches/hour) × 60. Split across days and cycles for better infiltration.
Catch-Cup Helper (find your precip rate)
Run your zone for a set number of minutes, then measure how much water (inches or mm) collected in cups or straight-sided containers.