01
Clear the cover
Take the old cover off so you can see the full acrylic lip. Measure the shell, not the wood cabinet and not the old cover — covers shrink and sag.
Guide
How to measure a spa in ten minutes.
A cover that almost fits still leaks heat. A, B, C, skirt, and fold are enough for the shop to cut.
Open the measuring tool
02
A and B — length and width
Run a tape across the longest outside edges of the acrylic. A is overall length (up to 192″), B is width (up to 144″). Round covers: diameter only, max 120″.
03
C — radius or cut
Rounded corners: set a square in the corner; the gap to where the curve leaves is the radius (max 22″). Cut corners: measure the chamfer itself (max 50″). Odd cuts need D and E, the remaining side lengths.
04
Skirt and fold
Skirt from the top of the acrylic down the side, 0–6 inches. Note which way the cover should fold — longer side, shorter side, or either — so it matches the lifter.
What people get wrong
- Measuring the cabinet. The cover rests on acrylic. Extra wood width becomes a gap.
- Copying the old cover. Foam compresses. Vinyl pulls in. You’ll order small.
- Guessing the radius. A 4-inch corner on an 8-inch cut leaves a dog-ear. Use a square.
