Calculate how many gallons of water your lawn or garden needs per week and estimate sprinkler head coverage requirements.
💧 Irrigation Calculator
Gallons per Week
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Sprinkler Heads Needed
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Mins to Run (1 GPM head)
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💡 Pro Tip
Water deeply and infrequently rather than daily shallow watering. Deep watering (1 inch at a time) encourages roots to grow 6 inches deep, making grass much more drought-resistant.
Frequently Asked Questions
Q: How much water does a lawn need per week?
Most lawns need 1–1.5 inches of water per week. One inch of water per 1,000 sq ft equals about 623 gallons. So a 5,000 sq ft lawn needs about 3,115 gallons per week.
Q: How many sprinkler heads do I need?
A standard rotary sprinkler covers a 15–25 foot radius. For square coverage calculation: divide your lawn area by the coverage area of one sprinkler head.
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