calcs.homes
calcs.homes
Enter your pool's surface size and pick the conditions closest to yours to estimate how much water evaporation is costing you.
Estimate only — actual evaporation varies with humidity, sun exposure, and water temperature.
We multiply surface area by a daily depth-loss rate — about 1/8 in for a calm or covered pool, 1/4 in for average conditions, and up to 1/2 in or more for a hot, windy, or heated pool — then convert that volume to gallons. A pool cover is the single biggest lever for cutting evaporation, since it blocks both wind and direct sun exposure.
Typically 1/4 inch of depth per day under average conditions, more in hot, dry, or windy weather, or with a heated pool. A pool cover can cut this significantly.
Try a bucket test: place a bucket on a pool step filled to the same level as the pool, mark both water lines, and check after 24 hours. If the pool has dropped noticeably more than the bucket, you likely have a leak, not just evaporation.