Garden watering calculator
PROWeekly gallons of water for your beds or lawn.
Short answer: gal = area × inches × 0.623. 500 sq ft × 1" = 311.5 gal / week ≈ 44.5 gal / day. Enter your measurements above and the garden watering calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Gallons per week
312
Gallons per day
45
Minutes @ 5 gpm
63
How does the garden watering calculator work?
gal = area × inches × 0.623.
What does a worked example look like?
500 sq ft × 1" = 311.5 gal / week ≈ 44.5 gal / day.
What do people ask most?
›How much water do plants need?
Most vegetables and lawns need ~1 inch of water per week.
Which garden calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.