DIY Calculator

Lawn Watering Calculator

Estimate weekly watering needs by lawn size, grass type, and season.

What drives watering needs

  • Season

    Summer heat and longer days push water demand up. Spring and fall need less; winter needs very little on dormant lawns.

  • Grass type

    Cool-season grasses like tall fescue and bluegrass typically need more water than drought-tolerant warm-season types like Bermuda or zoysia.

  • The 1-inch rule

    One inch of water over 1,000 sq ft equals roughly 623 gallons. This calculator converts your weekly inch target into total gallons.

  • Deep vs. daily

    Fewer deep soakings encourage roots to grow down. Light daily sprinkles keep the surface wet but do not build drought tolerance.

FAQ

How many gallons of water does a lawn need per week?
A rough rule: 1 inch of water over 1,000 sq ft is about 623 gallons. This calculator estimates weekly gallons from seasonal inch targets for your grass type.
Is it better to water deeply or daily?
Deep, less frequent watering encourages deeper roots. Most lawns do better with fewer deep sessions than daily light sprinkles.