It is essential that you measure your hot tub correctly to get the correct size for your hot tub cover. If you make a mistake at this stage, then you might order the wrong size or shape cover and have a useless cover. It should only take a few minutes to get the correct size of cover needed, and with that information, you can get a cover which will fit your hot tub exactly.
You first need to measure how long of a skirt you need. The skirt is the part which hangs down over the side of your hot tub and helps to keep the heat in. If you have a wood rail around your hot tub, then measure from the wood rail to the top of the hot tub lip. If you do not have a wooden rail, then measure from The top of the lip to the bottom of the lip. Add 1/2 an inch to both measurements.
For the measurement of your hot tub, it depends on the shape of your hot tub. For a square hot tub, measure from one side to the other. For a rectangle hot tub, measure the long side and the short side. For around hot tub, measure the diameter of the hot tub. For an octagon, measure from one side to the other and measure one side length. For each length measurement, measure