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 an 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.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

The Pool Chemical Calculator returns results based on the inputs and the tool methodology. Check assumptions, units and source dates. Treat projections as estimates. 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.