Calculate irrigation water needed, gallons required, sprinkler run time, drip irrigation flow, application rate, coverage area, water cost, and irrigation schedule estimates. Use this irrigation calculator for lawns, gardens, landscapes, trees, raised beds, fields, drip systems, sprinkler zones, and outdoor watering planning.
Water needed:
The calculator multiplies irrigated area by desired water depth, then adjusts for efficiency, soil type, and rainfall offset.
Run time:
Enter system flow rate and gallons needed to estimate how long the irrigation system should run.
Application rate:
Enter flow rate, area, and run time to estimate how much water depth is applied per hour.
Drip irrigation:
Enter emitter count and flow per emitter to estimate drip system flow, water delivered, and run time.
An irrigation calculator helps estimate water needs, run time, system flow, and watering cost before setting a schedule.
It can be useful for lawns, gardens, raised beds, drip systems, sprinkler zones, landscapes, trees, small fields, greenhouses, and outdoor watering plans.
Your result shows estimated gallons needed, liters needed, irrigation run time, gallons per week, gallons per month, application rate, flow rate, drip system output, rainfall-adjusted water need, and estimated water cost.
One inch of water over 1,000 square feet is about 623 gallons. One inch over one acre is about 27,154 gallons.
Divide the gallons needed by the irrigation system flow rate. For example, 600 gallons needed with a 10 GPM system takes about 60 minutes.
Many lawns and gardens are often planned around about 1 inch of water per week, but actual needs vary by plant type, weather, soil, season, rainfall, and local climate.
Actual irrigation can vary because of pressure changes, clogged emitters, sprinkler overlap, wind, runoff, slope, leaks, soil absorption, plant needs, and uneven coverage.