Free pool tools

Pool Calculators

Turn pool dimensions and water test results into clear, practical answers. Choose a calculator by the job you need to do—no formulas or guesswork required.

Find a calculator Start with pool volume

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Search by a reading, problem, chemical, or piece of equipment.

14 free calculators

Start with the right numbers

Getting started

3 calculators
Start here Pool Volume Calculator Find your pool's gallons or liters for rectangular, round, oval, kidney, and L-shaped pools. You’ll need: Pool shape and dimensions Open calculator Best for a full water test Pool Chemistry Calculator Work through alkalinity, pH, calcium, CYA, and chlorine in the right balancing order. You’ll need: Pool volume and test results Open calculator Quick multi-chemical dosing Pool Chemical Calculator Get an exact dose for chlorine, pH, alkalinity, calcium hardness, or stabilizer from one tool. You’ll need: Pool volume, current and target levels Open calculator

Dose one adjustment precisely

Water chemistry

9 calculators
Daily sanitizer Pool Chlorine Calculator Calculate liquid chlorine, cal-hypo, dichlor, or trichlor doses using your target and CYA. You’ll need: Gallons, chlorine reading and product Open calculator Algae or heavy use Pool Shock Calculator Find the right shock dose for routine treatment, cloudy water, algae, or a heavy swimmer load. You’ll need: Gallons, current chlorine and shock type Open calculator Raise or lower pH Pool pH Calculator See how much muriatic acid, dry acid, or soda ash to add to reach your target pH. You’ll need: Gallons, current and target pH Open calculator Stabilize pH Pool Alkalinity Calculator Calculate baking soda to raise total alkalinity or acid to bring a high reading down. You’ll need: Gallons, current and target TA Open calculator Protect plaster, stop scale Pool Calcium Hardness Calculator Get an exact calcium chloride dose to raise calcium hardness, or the drain-and-refill percentage to lower it. You’ll need: Gallons, surface type, current and target CH Open calculator Lower pH or alkalinity Pool Acid Calculator Get a precise muriatic acid or dry acid dose while accounting for acid strength and pool size. You’ll need: Gallons, test readings and acid type Open calculator Protect surfaces and equipment Pool LSI Calculator Check whether your water is balanced, scale-forming, or likely to etch plaster and grout. You’ll need: Complete water test and temperature Open calculator Saltwater pools Pool Salt Calculator Convert the gap between your current and target salt level into pounds and 40-pound bags. You’ll need: Gallons, current and target salt Open calculator Protect chlorine from the sun Pool Stabilizer (CYA) Calculator Get the exact ounces of granular or liquid stabilizer to raise CYA, or how much water to replace to lower it. You’ll need: Gallons, current and target CYA, product Open calculator

Plan the system around your pool

Equipment & budget

2 calculators
Size pool equipment Pool Pump Size Calculator Estimate the flow rate, horsepower, and pump type needed for healthy circulation. You’ll need: Gallons, turnover time and plumbing Open calculator Plan your budget Pool Loan Calculator Compare monthly payments, total interest, and financing cost across rates and loan terms. You’ll need: Project cost, down payment, rate and term Open calculator

The numbers are only step one

Use your result with the right guide

Browse all maintenance guides
Weekly Pool Maintenance A simple testing and treatment routine. Clear Cloudy Pool Water Find the cause before adding more chemicals. Clean a Green Pool A complete algae recovery plan. How to Shock a Pool Apply the calculated dose safely.