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Lawn Water Requirement

Estimate weekly sprinkler time and water for your lawn.

About Lawn Water Requirement

The lawn's water volume comes from area times weekly inches, and dividing by sprinkler flow converts that into run time. Lawns drink a surprising amount of water, so a sprinkler schedule keeps grass healthy without running it longer than needed.

Formula

Lawn Water Requirement

Gallons = area x inches x 0.623; time = gallons / sprinkler gpm

inches per week
Common lawns need about 1 to 1.5 inches weekly

Worked example

With the default values below, Lawn Water Requirement returns Gallons per Week of 1,869. Change any input above and every figure here is recalculated in your browser.

Inputs used

Lawn areaminimum 0 sq ft
2,000 sq ft
Water per weekminimum 0 in
1.5 in
Sprinkler flowminimum 1 gal/min
8 gal/min
Water priceminimum 0
0.004

Results

Gallons per Week
1,869 gal
Sprinkler Time
234 min
Monthly Cost
$32.48

Step by step

  1. 1Values used
  2. 2Lawn Water Requirement
  3. 3Gallons per Week= 1,869 gal
  4. 4Sprinkler Time= 234 min
  5. 5Monthly Cost= 32.48

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Lawn Water Requirement calculated?

Gallons = area x inches x 0.623; time = gallons / sprinkler gpm The lawn's water volume comes from area times weekly inches, and dividing by sprinkler flow converts that into run time.

Why does Lawn Water Requirement matter?

Lawns drink a surprising amount of water, so a sprinkler schedule keeps grass healthy without running it longer than needed.

What values do I need to enter?

This calculator takes 4 inputs: Lawn area, Water per week, Sprinkler flow, Water price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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