basic

Lawn Watering Time Calculator

Minutes to deliver an inch of water by sprinkler.

Compute how many minutes a sprinkler needs to run to deliver a given depth of water (typically 1 inch / week) over a lawn area, from the sprinkler's gallons-per-minute output.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

ft²
in
GPM

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Gallons needed = area_sqft · depth_in · 0.6234. Minutes = gallons / GPM.

In depth

Compute how many minutes a sprinkler needs to run to deliver a given depth of water (typically 1 inch / week) over a lawn area, from the sprinkler's gallons-per-minute output.