Estimate how much water your garden needs each week and how long to water with a hose, drip line, sprinkler, or irrigation system. Calculate gallons needed, rainfall adjustment, watering sessions, run time, and estimated water cost.
Garden area mode:
The calculator uses garden area, weekly water depth, rainfall, and efficiency to estimate gallons needed.
Raised bed mode:
The calculator multiplies bed area by the number of beds and adjusts water needs for rainfall and conditions.
Container mode:
The calculator uses the number of containers and gallons per container per watering to estimate weekly water needs.
Run time mode:
The calculator estimates how long to water based on gallons needed and system flow rate.
A garden watering calculator helps estimate how much water your garden needs and how long to run your irrigation system.
It can help avoid overwatering, underwatering, wasted water, dry raised beds, inconsistent container watering, and unclear irrigation run times.
Your result shows weekly gallons needed, gallons per watering session, irrigation run time, monthly gallons, estimated water cost, rainfall adjustment, efficiency adjustment, and water depth needed after rainfall.
Many gardens use about 1 inch of water per week as a starting estimate, but actual needs vary by crop, soil, heat, wind, rainfall, mulch, and plant maturity.
One inch of water over one square foot is about 0.623 gallons.
Divide gallons needed per watering session by your hose, drip, sprinkler, or irrigation system flow rate in gallons per minute.
Yes. Rainfall helps meet part of the weekly water requirement. Subtract rainfall from the target weekly water depth before calculating irrigation water.
No. This is an estimate. Actual watering needs can vary by plant type, soil texture, mulch, drainage, weather, wind, sun exposure, irrigation pattern, and local conditions.