Round Pool Liners
If you have a round swimming pool, measure the diameter straight across the center of the pool in a couple of different places, inside the top of the pool liner wall to inside the top of the opposite wall. Sometimes above ground pools get slightly out of round and taking the average of 2 or 3 diameter measurements is a good idea. The circular liner pool calculator will give you an estimate only of pool volume liner size. Be sure to check with a pool specialist before getting a pool liner.