If you’ve ever tried to buy a pool cover and felt like the sizes make no sense… you’re not alone. The trick is this: pool covers are NOT the same size as your pool (at least, not most of them).
This guide breaks it down simply—so you can pick the right size the first time (and avoid the dreaded “return shipping regret”).
What Size Pool Cover Do I Need?
Winter covers: Add +4 feet to your pool’s length and width (≈2 ft overlap per side)
- Solar covers: Match your pool size exactly (or slightly bigger and trim)
- Round pools: Add +3–5 feet to diameter for winter covers
Think of it like buying a fitted sheet vs. a blanket:
- Solar cover = fitted sheet (exact fit)
- Winter cover = oversized blanket (hangs over edges)
2026 Pool Cover Sizing Chart (Most Common Sizes)
Rectangular Pools
|
Pool Size |
Winter Cover Size |
Solar Cover Size |
|
12' × 24' |
16' × 28' |
12' × 24' |
|
16' × 32' |
20' × 36' |
16' × 32' |
|
18' × 36' |
22' × 40' |
18' × 36' |
|
20' × 40' |
24' × 44' |
20' × 40' |
Rule: Add 4 feet total (2 ft per side) for winter covers
Round Pools
|
Pool Diameter |
Winter Cover Size |
Solar Cover Size |
|
15 ft |
18 ft |
15 ft |
|
18 ft |
21 ft |
18 ft |
|
24 ft |
27–28 ft |
24 ft |
Rule: Add 3–5 feet to diameter
Oval Pools (Quick Rule)
- Measure longest length + widest width
- Add 2–3 feet per side for winter covers
Why Pool Covers Are Bigger Than Your Pool
Winter Covers (Oversized on Purpose)
- Anchor with water bags or cables
- Prevent wind from lifting the cover
- Keep debris out (leaves LOVE gaps)
No overlap = cover fails when you need it most
Solar Covers (Exact Fit)
Solar covers float directly on the water, so:
- No overlap needed
- Often trimmed for a custom fit
- Should sit just inside the pool edge
Too big = bunching and reduced heating efficiency
How to Measure Your Pool (The Right Way)
Before buying anything, grab a tape measure:
Step-by-step:
-
Measure inside edge to inside edge (not the deck)
-
Record:
-
Length
-
Width (or diameter for round pools)
-
Round to the nearest inch
-
Apply the sizing rules above
Pro Tip: Measure twice—returns on oversized covers are way less fun than pool days.
Common Sizing Mistakes (Avoid These)
- Buying a winter cover the same size as your pool
- Forgetting overlap space for anchors or cables
- Not accounting for steps or odd shapes
- Guessing instead of measuring
For freeform pools: always size to the longest and widest points and expect some trimming or a custom cover.
Final Thoughts
Choosing the right pool cover size isn’t complicated once you know the rule:
Winter cover = bigger than your pool
Solar cover = same size as your pool
Get that right, and everything else—installation, protection, and even your spring opening—gets a whole lot easier.
