Before going any further you should verify your pool size first. I know this sounds ridiculous but many people each year order the wrong size liner. Measuring a pool only takes a minute of your time but can save you money and time. Once a pool liner box is opened it cannot be returned.
To measure round pools simply measure straight across the middle to the opposite side. Take the time to measure across from two different directions just to be sure. On oval shaped pools measure right down the middle at it’s longest point and across from side to side. You should also measure the wall height on every pool. To do this simply measure from where the pool touches the ground to just under the top ledge. Wall heights are 48″, 52″ and 54″. Wall height measurement is critical when replacing beaded and unibead pool liners.
If you have an overlap liner wall height does not matter as the liners are more than tall enough for any wall height. If you have a deep end or deep middle make note of water depth at the deepest point. Be sure to share your findings with your pool dealer so he can recommend the correct expandable liner for your application.