To measure for a replacement hot tub cover, start with the overall length and width, then check the corner radius and skirt length. These measurements describe different parts of the cover. This guide explains where to measure each one before you order.
Your measurements are the finished cover size.
We build to the dimensions you provide. We do not add extra material or automatically adjust the size for fit. We review your measurements and contact you if something looks wrong, but make and model alone cannot confirm the dimensions of your spa.
Should you measure the old cover or the spa?
If your old cover is intact and fits well, measure it. Working with a second person makes it easier to keep the tape straight and read accurately.
If the cover is damaged, distorted or missing, measure the spa itself. Measure the outline you want the new cover to cover, rather than just the opening where the water is.
The dimensions you order must allow the fit you want. Contact us before adding clearance to a cut-corner shape: changing the overall size also changes the corner measurements.
Measure the overall length and width
Measure straight across the cover or spa outline, from one outside edge to the opposite outside edge.
Measure in the other direction too, even if the spa appears square. Do not assume the two dimensions are the same.
Record both measurements in inches and match them to the diagram for your selected shape in the cover builder.
When measuring an old cover, measure the cover body, not the hanging vinyl skirt. For a round cover, measure the diameter: the straight distance across the center from one outside edge to the other.
The cover builder accepts whole inches and instructs you to round fractional overall dimensions up to the next whole inch. Contact us first if you are unsure how that affects your fit, especially for a cut-corner shape. Corner radius uses different guidance; see the radius guide below.
For cut corners or another shaped outline, the overall dimensions alone are not enough. Follow the shape diagram for the additional measurements.
What about a wooden lip?
You can choose whether the cover extends over the wooden lip. Measure the outline you want the new cover to cover.
If you want the skirt to hide the lip too, include that depth when choosing the skirt length.
Choose the cover skirt length
The skirt is the vinyl flap hanging below the cover. Its length is a cosmetic choice, rather than an insulation setting.
Measure from the top of the spa down to where you want the skirt to end. Most skirts cover the acrylic shell without extending farther down the cabinet.
Record the skirt length separately from the cover’s overall length and width.
Measure the hot tub cover corner radius
The radius describes the curve of a rounded corner. It is not the distance around the curve.
Use a framing square, or straightedges and a tape measure, to find it. Our illustrated guide also includes a printable radius chart.
The online builder includes the most common cover shapes. For a different outline, call us before ordering so we can explain which measurements we need.
Speaker or control cutouts
Cutouts need extra measurements to show their size and position. Contact us for measuring instructions before placing an order for a cover with cutouts.