Expert Verified Updated: March 2026

Evaporation Loss Calculator

Determine if your water loss is normal physics or a structural leak. Calculate the volume of water lost per week.

Quick Conclusion
A typical outdoor pool loses between 1/8 to 1/2 inch of water daily due to evaporation. Factors like low humidity, high winds, and warm water temperatures accelerate this process. If you are losing more than an inch of water a day, you likely have a physical leak in the plumbing or structure.

Technical Comparison

Loss Depth Gal (15k Pool) Gal (25k Pool)
1/4 Inch ~75 Gal ~125 Gal
1/2 Inch ~150 Gal ~250 Gal
1.0 Inch ~300 Gal ~500 Gal

Actionable Steps

Pro-Tip

The "Wind Tunnel" Effect: Wind is the silent killer of pool water levels. A 10mph breeze can double the evaporation rate compared to a still day. If your pool is in an open area, consider a windbreak or a solar cover to shield the surface from moving air.

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