How do I measure an irregular pool for a cover?

Measure the maximum length and width at the pool’s extremes, then add one to two feet to each. Pool cover manufacturers assume a rectangle, so an oversized rectangular cover sized to the farthest points works fine for kidney-shaped or freeform pools. The excess flaps over the edges, which is what water bags or cable anchors handle. Don’t try to save an inch—measure twice, add a foot, order once.