Expert Verified Updated: March 2026

Solar Cover Size Calculator

Trap the heat and save your chemicals. Calculate the required dimensions and square footage for your pool's solar blanket.

Quick Conclusion
Solar covers (bubble blankets) must be sized to match the interior water line of your pool. For standard rectangular pools, purchase the exact size (e.g., 18x36 for an 18x36 pool). For custom shapes, buy a rectangle that exceeds the maximum length and width, then trim it back so it floats freely without bunching against the walls.

Technical Comparison

Cover Grade Thickness (Mil) Expected Life
Standard 8 Mil 1-2 Years
Heavy Duty 12 Mil 3-5 Years
Ultra Grade 16 Mil 5-7 Years

Actionable Steps

Pro-Tip

The "White Sheet" Secret: The #1 reason solar covers fail is "off-pool" UV exposure. When the cover is rolled up on a reel in the sun, the layers of plastic act like a magnifying glass. Internal heat can reach 180ะ ย ะฒะ‚โ„ขะ โ€™ะ’ยฐF, melting the bubbles. Always use a white UV-reflective protective sheet when the cover is on the reel.

Frequently Asked Questions

How do they work?

They trap solar energy and prevent heat loss through evaporation.

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