💧
Irrigation Calculator

Irrigation & Water Needs

Calculate exactly how long to run your sprinklers to hit your weekly watering target.

Calculate Your Run Time

Enter your lawn size, water target, and sprinkler output to get a precise run time per session.

💡 Don't know your sprinkler output? Do a catch-cup test: place an empty tuna can in your spray zone, run sprinklers for exactly 15 minutes, then measure the water depth in the can (inches). Multiply by 4 to get inches per hour.
Run Time per Session
—
Gear & Tips
What You'll Need
My Spreader Pick
Top Pick
ECHO RB-60 Heavy-Duty Broadcast Spreader
“The spreader I use on my own lawn — nothing else comes close.”
  • 60 lb hopper — covers up to 25,000 sq ft per load
  • Factory-calibrated spread pattern up to 8 ft wide
  • Maintenance-free gear case — no grease, no hassle
  • Foot-operated side deflector keeps product off driveways & beds
  • 10" pneumatic tires handle any terrain with ease
  • Powder-coated steel frame — 5-year consumer warranty
Check Price & Availability →
Affiliate link — I earn a small commission at no extra cost to you. I only recommend gear I personally use.

Watering Basics

Most lawns need 1–1.5 inches of water per week. Water deeply and infrequently rather than a little every day — this encourages deep root growth. Early morning watering reduces evaporation and fungal disease risk.