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Pool Volume & Chemical Calculator

Size the water and balance it in seconds. Get your pool volume in gallons by shape, then the exact chlorine, acid, baking soda, and stabilizer to add — or price a weekly service route.

Pool
Water volume
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The route is the business

Pool money is recurring money — the weekly route is the business, and every visit is volume times chemistry. Nail the gallons once and every dose falls out of it. Balance in the right order (alkalinity, then pH, then hardness, then stabilizer, then chlorine), never stack two strong doses, and keep acid and chlorine apart. Price the route by pool size, bill it monthly, and let the one-time green-pool jobs be the audition for a weekly account.

Questions

How many gallons is my pool?
Multiply length × width × average depth × 7.48 for a rectangle, or 0.7854 × diameter² × average depth × 7.48 for a round pool. Average depth is the shallow end plus the deep end divided by two. A 16 × 32 rectangle at 5.5 ft average holds about 21,000 gallons; a typical backyard pool is 15,000–20,000.
How much chlorine do I add?
About 10 fluid ounces of liquid chlorine (12.5%) per 10,000 gallons raises free chlorine by 1 ppm, so to move a 15,000-gallon pool from 1 to 3 ppm you would add roughly 30 ounces. Aim for a free chlorine of 3, and always add chlorine and acid separately, hours apart.
How much muriatic acid to lower pH?
Roughly 6.4 fluid ounces of muriatic acid (31%) per 10,000 gallons drops pH by about 0.1. Acid also lowers total alkalinity, so if both are high, add the acid once and retest — do not stack the two doses. Target a pH of 7.5.
Is this calculator free?
Yes. It runs entirely in your browser, there is no sign-up, and nothing is stored anywhere but your own device.

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