Guide: Spa Cover Measurement

measuring tape

Ensure a precision fit for your new custom spa cover using this handy step-by-step instruction guide. All you need is a tape measure, pen & paper, and maybe a carpenter square. Let's get started!

Pro Measuring Tips:

Measure the old hot tub Cover if:

  • Cover hasn't warped or distorted since purchase
  • You like the way the old cover fits

Measure the spa Shell if:

  • Old cover missing or not happy with fit
  • Cover is warped, sagging, or distorted

More Tips:

  • Reading a tape measure is easier with a helper
  • Manufacturing tolerance is ± ¾"
  • Covers 1-2" oversize tend to fit well vs. too small

Choose Your Cover Shape:


4-Sided Spas:

measuring for your new spa cover

1. Measuring Length & Width:

  • Measure widest outer edge of spa shell/cover
  • Length/width inches are rounded UP
  • Center hinge folds your "A" dimension in half
  • Square (equal length/width) - fold is not an issue
  • Rectangle has unequal sides - cover usually folds away from keypad (long side folds in half)
  • Small variances (i.e. 84"x85") are likely square
measuring corner radius

2. Measuring Corner Curve:

  • Use a carpenter square to measure corner radius of cover or widest part of actual shell corner rim
  • Where the corner curve touches the inch marks of the square is the radius
  • Round radius DOWN - a smaller number always fits a larger curve
  • NOTE: Squared corners have a 0” radius
Measuring spa cover skirt

3. Measuring the cover Skirt Length:

  • Measure skirt down from cover seam
  • Or measure exposed spa shell lip plus about ½"
  • Round skirt length UP to the nearest whole inch
  • All straps extend about 4” below length of skirt
  • New strap latches supplied - OEM position varies

Round Hot Tubs:

duratherm round spa cover measuring

1. Measuring Diameter:

  • Measure widest outer edge of spa shell/cover
  • Outside diameter is rounded UP to nearest inch
  • Cover is for perfect circle only - no oblong or oval
Measuring spa cover skirt

2. Measuring the cover Skirt Length:

  • Measure skirt down from cover seam
  • Or measure exposed spa shell lip plus about ½"
  • Round skirt length UP to the nearest whole inch
  • All straps extend about 4” below length of skirt
  • New strap latches supplied - OEM position varies

8-Sided Spas:

8 sided spa cover measuring

1. Measuring Length & Width:

  • Info goes into a CAD drawing for your approval
  • Measure widest outer edge of spa shell/cover
  • Length & width inches are rounded UP
  • Center hinge folds your "A" dimension in half
  • Equal Octagon has same dimensions all sides - fold orientation isn't an issue
  • 4 Cut Corners has longer sides - cover usually folds away from keypad (long side folds in half)
  • Small variances (i.e. 84"x85") are likely equal
8 sided spa covers

2. Measuring Cut Corners:

  • Measure rounded corners from center of curve
  • Round cut corner inches DOWN - a smaller number will always fit over a longer corner
measuring cover skirt octagon

3. Measuring the cover Skirt Length:

  • Measure skirt down from cover seam
  • Or measure exposed spa shell lip plus about ½"
  • Round skirt length UP to the nearest whole inch
  • All straps extend about 4” below length of skirt
  • New strap latches supplied - OEM position varies

ETA (Build + Transport time): 4-6 weeks.

Customer Reviews

Based on 2691 reviews
83%
(2228)
12%
(322)
3%
(69)
1%
(29)
2%
(43)
W
William G.
Weather shield much nicer looking material

And besides that it was so much lighter. In fact our old one was probably heavier than this when it was brand new. So overall we are very happy to be able to lift it easier. This is our second cover the old one lasted about 5 maybe 6 years. But this is the first one with this weather shield.

B
Brian B.
As Expected

Spa cover was as expected. It shipped much sooner than the original shipping time frame provided.

C
Clifford R.
High quality cover

My hot tub retains heat significantly better with this cover compared to the old cover I was using previously. I am using the metallic heat shield.

M
M.B.
Excellent cover

Lightweight, durable, easy to open. Love this cover.

K
K.H.
4 years before falling apart

I’ve been very happy with the cover up until the four year mark, at which time the fabric started ripping and the seams falling apart. The tub is not sheltered at all, and I live in New England, so the cover did endure some abuse from the elements, but I expected that with a little duck tape I could squeeze at least five years out of it, but no way. The cover is falling apart in every way - the seams, the fabric, you name it. For $500 (2019 prices), I expected more life than I got.

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