Pool chemistry calculators that show their math
Work out exactly how much chlorine, acid, salt or stabilizer your pool needs. Every calculator shows its formula and worked examples, so you can check the math and understand what you're adding before it goes in the water.
Calculators
Pool volume calculator
Gallons and liters for rectangular, round, oval and kidney pools.
ChlorinePool chlorine calculator
Dose of liquid chlorine, bleach, cal-hypo, dichlor or trichlor.
ChlorinePool shock calculator
The shock level for your stabilizer and how much product it takes.
BalancePool pH calculator
Muriatic acid, dry acid or soda ash dose, using your alkalinity.
BalanceTotal alkalinity calculator
Baking soda to raise it, or acid to lower it.
SaltPool salt calculator
Pounds and bags of salt for a saltwater pool.
ChlorineStabilizer (CYA) calculator
How much cyanuric acid to add, and the chlorine level it needs.
BalanceCalcium hardness calculator
Calcium chloride to add, or how much water to replace.
BalanceLSI (saturation index) calculator
Is your water corrosive, balanced or scale-forming?
WaterDrain and refill calculator
How much water to replace to lower CYA, calcium or salt.
EquipmentPool heater size calculator
BTU needed, using the US Department of Energy method.
EquipmentPump turnover calculator
Flow rate (GPM) for your turnover time.
Guides
Ideal pool chemical levels
The chart of target ranges, what each number does, and the order to fix them.
Free chlorine and stabilizer
Why your chlorine level depends on CYA, with a full table.
How to shock a pool
The right shock level, step by step, and how to know algae is gone.
Lowering pH and alkalinity
Why pH keeps rising and how to fix pH and alkalinity without overshooting.
Saltwater pool chemistry
Salt, CYA, pH and cell care for pools with a salt chlorine generator.
Why is my pool cloudy?
The five common causes and a test-first checklist.
How to test pool water
Strips vs. drop kits, and the readings that mislead.
Pool chemical safety
What never to mix, how to add chemicals, and safe storage.
How we approach this
Most pool dosing charts give one number per 10,000 gallons and stop there. But how much chlorine you need depends on your stabilizer, and how much acid moves pH depends on your alkalinity. Our calculators take those into account, use published chemistry and sources such as the CDC and the US Department of Energy, and explain their assumptions. Read our editorial policy to see how the tools are built and checked.