Garden & Outdoor calculator
What Sprinkler Coverage Do I Need?
Use lawn length, lawn width, candidate sprinkler radius to find sprinkler count and spacing.
Enter your measurements
What Sprinkler Coverage Do I Need uses lawn length, lawn width, candidate sprinkler radius and the other configured measurements to return sprinkler count and spacing with a formula written specifically for this tool.
- Lawn length — Required
- Lawn width — Required
- Candidate sprinkler radius — Required
- Required spray overlap — Required
Sprinkler count and spacing
Enter the measurements above to calculate sprinkler count and spacing.
How the calculation works
V9 calculation: effectiveSpacing=2×sprinklerRadius×(1-overlapFraction); countLength=ceil(lawnLength/effectiveSpacing); countWidth=ceil(lawnWidth/effectiveSpacing); sprinklerCount=countLength×countWidth. The result is reported as sprinkler count and spacing.
Worked example
Example: Lawn length = 1200 cm; Lawn width = 800 cm; Candidate sprinkler radius = 300 cm; Required spray overlap = 25%. Result: Count Width = 2; Sprinkler Count = 6; Count Length = 3; Effective Spacing = 450 cm.
Before you decide
The result is only as accurate as the measurements entered. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what sprinkler coverage do i need, the limiting result on this page is sprinkler count and coverage.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Sprinkler Coverage calculator tell me?
It returns sprinkler count and coverage from the measurements entered on this page. The calculation is specific to sprinkler coverage, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for sprinkler coverage?
Measure lawn length, lawn width, candidate sprinkler radius, required spray overlap. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the sprinkler count and coverage?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned sprinkler count and coverage while allowing for the clearances, tolerances or ratings shown by its manufacturer.