Above-Ground Pool Chlorine Dosing Calculator
Get the right chlorine dose every time. Enter your pool volume, current and target chlorine levels, and the strength of your chlorine product to calculate exactly how much to add.
About this calculator
Calculate the amount of liquid or granular chlorine needed to raise your pool's free chlorine level to a target ppm based on pool volume and product strength.
Frequently Asked Questions
How is pool chlorine dosage calculated?
It's based on the ppm increase needed multiplied by pool volume and a conversion factor (8.34 lbs per million gallons per ppm), then adjusted for your product's available chlorine strength.
Why does chlorine product strength matter?
Liquid chlorine, cal-hypo, and dichlor all have different percentages of available chlorine, so the amount of product needed varies significantly even for the same ppm increase.
How often should I test and dose chlorine?
Most pool owners test chlorine levels daily during heavy use and dose as needed to keep free chlorine between 1-3 ppm, or higher during shock treatments.