Pool Evaporation Calculator
Estimate pool evaporation, refill water and cost from surface area, evaporation depth and cover reduction.
Default project preview
1,052 gal
Daily water loss
35.1 gal
Annual water loss
12,799 gal
Pool surface area
450 ft²
Monthly depth equivalent
3.75 in
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Pool length
Enter this project assumption in ft. The current imperial default is 30 ft.
Pool width
Enter this project assumption in ft. The current imperial default is 15 ft.
Daily evaporation depth
Enter this project assumption in in/day. The current imperial default is 0.25 in/day.
Cover-use reduction
Enter this project assumption in %. The current imperial default is 50 %. Minimum: 0. Maximum: 100.
Pool days per month
Enter this project assumption in days. The current imperial default is 30 days. Minimum: 1. Maximum: 31.
Water price
Enter this project assumption in per 1,000 gal. The current imperial default is 8 per 1,000 gal. Minimum: 0.
How to read the outputs
Daily water loss
adjusted estimate. Default preview: 35.1 gal.
Annual water loss
same daily rate. Default preview: 12,799 gal.
Pool surface area
rectangular surface. Default preview: 450 ft².
Monthly depth equivalent
after cover reduction. Default preview: 3.75 in.
Monthly refill cost
water only. Default preview: $8.42.
Uncovered daily loss
before cover reduction. Default preview: 70.1 gal.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Evaporation volume = surface area × daily depth × (1 − cover reduction).
FAQ
Pool Evaporation Calculator questions
How can I compare evaporation with a leak?+
Use a controlled bucket test under similar conditions.
Do covers eliminate all evaporation?+
No. Results depend on coverage and use.
Does this include splash-out?+
No. Add splash and backwash losses separately.