The Basics
11 free calculators — every one shows its formula and a worked example.
Pool Chemistry 101The 7 test numbers explained once — pool care stops being mysterious.Saltwater vs. ChlorineSalt pools make their own chlorine — here's the real trade-off.Water Test Report CardType in your test results, get a report card and a fix-it order.Pool Testing Schedule BuilderWhat to test and how often, tuned to your pool. Printable.Pool Cheat Sheet MakerPrint a card with your pool's numbers for the equipment pad.Can I Swim Yet?Added chemicals? Find out exactly when it's safe to swim.Kidney Pool Volume CalculatorGallons for kidney & freeform pools — the shape the standard calc skips.Pool Volume CalculatorHow many gallons your pool holds — the number everything else needs.Intex Pool Chemical CalculatorHow much chlorine for your Intex pool, by size — and what to skip.Above Ground Pool GallonsGallons for every standard above-ground size, wall height handled.New Pool Owner Starter KitThe honest first shopping list, sized to your pool.