Pool Chlorine Calculator

What this tool does

Estimate pool chlorine from entered measurements. Strength is available chlorine weight percent, not an unverified product label number. Chlorine demand, pH and stabilizer can affect actual levels.

How to use the Pool Chlorine Calculator

1. Enter or select pool volume in gal.
2. Enter or select current free chlorine (ppm).
3. Enter or select target free chlorine (ppm).
4. Enter or select available chlorine by mass (%).
5. Enter or select liquid product density (kg per liter).
6. Read the calculated result; change any measurement to compare alternatives.

Formula

available chlorine grams=liters×max(0,target−current)/1000; product grams=chlorine grams/(strength/100); liquid liters=product grams/(density×1000)

volume

Pool volume (gal, before metric conversion)

current

Current free chlorine (ppm)

target

Target free chlorine (ppm)

strength

Available chlorine by mass (%)

density

Liquid product density (kg per liter)

Strength is available chlorine weight percent, not an unverified product label number. Chlorine demand, pH and stabilizer can affect actual levels.

Worked example

For pool chlorine calculator, the following measurements illustrate the exact method: Pool volume: 15000; Current free chlorine (ppm): 1; Target free chlorine (ppm): 3; Available chlorine by mass (%): 10; Liquid product density (kg per liter): 1.16.

Results explained

Required product mass (grams)

Required product mass (grams) from the formula above. Strength is available chlorine weight percent, not an unverified product label number. Chlorine demand, pH and stabilizer can affect actual levels.

Liquid volume if entered density applies (liters)

Liquid volume if entered density applies (liters) from the formula above. Strength is available chlorine weight percent, not an unverified product label number. Chlorine demand, pH and stabilizer can affect actual levels.

Frequently asked questions