Remember that if you measure twice you'll only have to order once! Measuring for a new pool liner can be tricky, that is why PTL Direct - Pools, Tubs & Liners provides instructions on measurement on our website. One time is that it's always easier to measure with the right friend or family member! You can find these instructions here: www.poolstubsliners.com/HowtoMeasureAboveGroundLiners