Pool volume calculator

How to measure your pool

Use a tape measure at water level, not the deck edge. For length and width, measure the longest and widest swimmable dimensions. For depth, you want the average — the calculator takes your shallow-end and deep-end depths and averages them, which works well for pools with a steady slope. If your pool has a long shallow shelf or a diving well, eyeball a weighted average instead.

Why volume matters more than people think

Almost every dosing mistake we see traces back to a wrong volume guess. Homeowners routinely over-estimate by 25–50% (“it's probably 25,000 gallons” — the typical screened Volusia County pool is 10,000–15,000). Overestimate and you chronically overdose: wasted chemicals, swinging pH, stinging eyes. Underestimate and your shock treatments never quite finish the job.

Write your number down somewhere permanent. It never changes, and it makes every future dose — including our chemical dosing calculator — actually accurate.