Hill Country Lawns Done Right
Quick answer: Enter your lawn size, sprinkler type, and watering schedule below to estimate how many gallons your irrigation uses each week and month — and the rough cost. Useful for staying within Austin Water rules and cutting your bill. Free quotes: (512) 690-4912.
Most homeowners have no idea how much water their sprinklers actually use until the summer bill arrives. This free calculator estimates your weekly and monthly irrigation volume from your lawn size and schedule, so you can right-size watering, spot waste, and stay compliant with Austin’s watering-day limits. Bookmark it and re-check whenever you change your controller.
Austin Irrigation & Water Usage Calculator
How the Estimate Works
The calculator multiplies your irrigated area by the inches of water applied per session (your sprinkler’s precipitation rate × run time) and converts to gallons (1 inch of water over 1 square foot is about 0.623 gallons). Spray heads put down water fast (~1.5 in/hr), rotors much slower (~0.5 in/hr), and drip slowest of all — which is why drip zones need longer run times but use far less water overall. Adjust the rate field to match your Austin Water tier for a closer cost figure.
Watering Smart in Austin
Austin lawns generally need about 1 inch of water per week in spring and fall and up to 1.5 inches in peak summer — ideally in one or two deep soakings rather than daily sprinkling, which trains deeper, drought-tougher roots. Water before dawn to cut evaporation and meet Austin Water’s time-of-day rules. If the calculator shows you applying well over 1.5 inches a week, you are likely overwatering: shorten run times or drop a day. Mulched beds and drip irrigation can cut outdoor use sharply.
Frequently Asked Questions
How much water should an Austin lawn get per week?
About 1 inch per week in spring and fall, up to 1.5 inches in peak summer, delivered in one or two deep waterings. Use the calculator to translate that into run times for your system.
Why is my summer water bill so high?
Spray systems apply a lot of water quickly, and daily watering compounds it. The calculator shows your monthly gallons so you can see the impact of an extra day or longer run time and adjust.
Does this account for Austin watering restrictions?
Set your watering days to match your allowed schedule and the estimate reflects it. Austin Water limits watering days and times; our Austin watering restrictions page has the current rules.