Pool Chemistry Calculators
Exact doses for chlorine, shock, salt, pH, alkalinity, stabilizer and calcium, plus a water-balance check.
- Pool Chemical CalculatorEnter your test results to get every chemical dose your pool needs, in the right order: alkalinity, pH, calcium, stabilizer and chlorine, with exact amounts.
- Pool Chlorine CalculatorHow much liquid chlorine, bleach, cal-hypo, dichlor or trichlor to add to raise free chlorine, plus the right chlorine level for your stabilizer.
- Pool Shock CalculatorWork out how much shock to add for algae, cloudy water or high combined chlorine. Uses your stabilizer level to set the right shock target.
- Pool Salt CalculatorFind how many pounds and bags of salt to add to your salt water pool to reach your chlorine generator’s target level. Works in gallons or litres.
- Pool pH CalculatorHow much muriatic acid or dry acid lowers your pool’s pH, or how much soda ash raises it. Uses your alkalinity and stabilizer for an accurate dose.
- Pool Alkalinity CalculatorRaise total alkalinity with baking soda or lower it with acid. Get the dose for your pool, the pH you will end up with, and how to aerate afterwards.
- Pool Stabilizer (CYA) CalculatorWork out how much cyanuric acid (stabilizer or conditioner) to add, or how much water to drain if CYA is too high, and the chlorine level you need after.
- Pool Calcium Hardness CalculatorHow much calcium chloride raises your pool’s calcium hardness, or how much to drain to lower it. Works for 77% flakes and 94% pellets.
- LSI Calculator (Saturation Index)Check whether your pool water is balanced, corrosive or scale-forming with the Langelier Saturation Index. Corrects alkalinity for CYA and shows the working.
Which calculator do you need?
If you have a full set of test results, use the pool chemical calculator. It puts every adjustment in order so one chemical doesn’t undo the last. If you only need to move one reading, go straight to that calculator.
The order matters
Alkalinity buffers pH, so adjust total alkalinity before pH. Calcium and stabilizer move slowly and don’t affect pH much. Chlorine goes last because pH changes how well it works, and you want it to read right once everything else is settled. Add one chemical at a time with the pump running, and wait for it to circulate before you retest.
Why stabilizer changes everything
Cyanuric acid (CYA) protects chlorine from sunlight but also holds most of it in reserve, so the more CYA you have, the more free chlorine you need for the same sanitizing power. That is why the chlorine and shock calculators ask for your CYA and set targets from it.