💧 Lawn Watering Calculator
Optimize your irrigation schedule and determine how much water your lawn needs
Privacy First: All calculations happen in your browser. No data is sent to any server.
Calculate Watering Needs
Leave blank if you don't know your sprinkler flow rate
How to Use This Calculator
- Select your grass type (cool-season or warm-season)
- Enter your lawn square footage
- Optionally enter your sprinkler flow rate for runtime calculation
- Click "Calculate" to see weekly water needs
- Adjust watering based on rainfall, temperature, and season
- Water deeply and infrequently (2-3 times per week) rather than daily
Frequently Asked Questions
How much water does a lawn need per week?
Most lawns need 1-1.5 inches of water per week, including rainfall. Cool-season grasses typically need 1-1.5 inches, while warm-season grasses can thrive on 0.5-1 inch.
What's the best time to water my lawn?
Early morning (4-10 AM) is ideal. This allows grass blades to dry before evening, reducing disease risk. Avoid evening watering as grass stays wet overnight.
Should I water every day or less frequently?
Water deeply and infrequently (1-1.5 inches, 2-3 times per week) rather than shallow daily watering. This encourages deep root growth and drought tolerance.
How do I know if I'm watering enough?
Place empty tuna cans around your lawn and run sprinklers until they contain 1 inch of water. Signs of underwatering include bluish-gray color and footprints remaining visible.