Pool evaporation calculator
PRODaily gallons lost to evaporation.
Inputs
Result
Gallons / day
68
Gallons / week
478
The formula
gal/day = surface × (in/wk ÷ 7) × 0.623.
Worked example
512 sq ft × 1.5 in/wk = 68 gal/day.
Frequently asked
›Normal rate?
¼" to 2" per week depending on wind, sun and humidity.