Pool math,
made simple.
Accurate, easy-to-use calculators for pool owners and professionals. Get the numbers you need to keep your pool in perfect condition.
Our Calculators
Select a calculator to get started — no sign-up required.
Pool Volume
Calculate water volume in gallons and litres for rectangle, oval, round, and kidney shapes.
Open calculatorChlorine
How much chlorine to add based on current levels, target ppm, and product type.
Open calculatorPool Shock
How much shock to add based on pool size, current chlorine, and CYA level.
Open calculatorSalt
How much salt to add to your saltwater pool based on current levels and pool size.
Open calculatorCyanuric Acid
How much CYA stabilizer to add, or whether you need to drain to lower it.
Open calculatorAlkalinity
How much baking soda or acid to raise or lower your pool's total alkalinity.
Open calculatorpH Balance
How much acid or soda ash to add, adjusted for your alkalinity level.
Open calculatorCalcium Hardness
How much calcium chloride to add or drain. Includes LSI water balance checker.
Open calculatorWhy PoolFormula?
Built for pool owners who want answers, not clutter.
Accurate Results
Industry-standard formulas used by pool professionals worldwide. Results you can trust for chemical dosing.
Works Everywhere
Phone, tablet, or desktop. Perfect for poolside calculations when you need an answer right now.
Fast & Free
No sign-ups, no ads cluttering results. Just fast, clean calculators that get straight to the answer.