Calculate your pool capacity in gallons Need to know how many gallons of water you pool holds? Use our simple calculator for your pool size. It's OK to guess at the numbers, but it is better to know the actual sizes. If you are unable to measure your pool, we can do it for you. Just order the service on our service form here.   Rectangular Pools What is the depth of the pool at the deep end? feet What is the depth of the pool at the shallow end? feet What is the width of your pool at its widest point? feet What is the length of your pool at its longest point?  feet Gallons   Circular Pools What is the depth of the pool at the deep end? feet What is the depth of the pool at the shallow end? feet What is the diameter of your pool? feet Gallons   Oval Pools What is the depth of the pool at the deep end? feet What is the depth of the pool at the shallow end? feet What is the width of your pool at its widest point? feet What is the length of your pool at its longest point?  feet Gallons   Free-Form Pools What is the depth of the pool at the deep end? feet What is the depth of the pool at the shallow end? feet What is the width of your pool at its widest point? feet What is the length of your pool at its narrowest  point? feet What is the length of your pool at its longest point? feet Gallons