Pool Chemical Calculator

Ideal ranges: Free chlorine 1-3 ppm, pH 7.2-7.6, Total alkalinity 80-120 ppm, Cyanuric acid (CYA) 30-50 ppm. Test water 2-3 times per week during swimming season and after heavy rain or high bather load.

To raise free chlorine by 1 ppm in a 20,000 gallon pool: add about 2.5 oz of calcium hypochlorite (granular shock) or 10 oz of liquid chlorine (sodium hypochlorite 12.5%). Always add chemicals to water, never water to chemicals.

To lower pH by 0.2 points in a 15,000 gallon pool, add about 12-16 oz of muriatic acid or 1 lb of dry acid (sodium bisulfate). Always add acid to water slowly, with the pump running. Retest after 4 hours of circulation.

The Pool Chemical Calculator is a free online tool that lets you calculate pool chemical dosages for chlorine, ph, alkalinity, and cya adjustments. It is part of NexTool's collection of free tools designed to help you work faster and more efficiently.

Yes, the Pool Chemical Calculator is 100% free to use with no limitations. There is no registration required, no daily usage caps, and no hidden fees. You can use it as many times as you need.

The Pool Chemical Calculator uses industry-standard formulas and algorithms to deliver reliable results. While the tool is designed for accuracy, results should be used as estimates and guidance. For critical decisions, always consult a qualified professional.

Yes, the Pool Chemical Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.