Measuring the Current Cover
Length and Width
If the cover being replaced fits correctly, it is best to simply measure the existing cover. Measure the length and width at the widest parts of the cover – being sure to ignore the rounded or cut corners.

Rounded Corners

Measuring rounded corners

Give the cover’s corner some extra slack by using smaller radius measurements
Measuring the Hot Tub
Length and Width

Measure the length and width, taking care to measure to and from the outside edge of the acrylic so the skirt will hang straight – like the vertical yellow line shown
Rounded Corners

Measure where the measuring device first touches the side of the spa