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Calculation Machine

Pool Chlorine Calculator

Dose liquid chlorine, tablets or shock for your pool volume.

Reviewed by the Calculation Machine team · How we check our maths

Your values

ⓘ Live results

Results
Dose needed
32.1 fl oz
In cups / pounds
4.01 cups
Chlorine rise
2 ppm
Shock dose (to 10 ppm)
1.25 gallons of liquid chlorine

Working

  1. 115,000 gal / 10000 x 2 ppm x 10.7 = 32.1

Quick answer

To raise chlorine by 1 ppm in 10,000 gallons you need about 10.7 fl oz of 12.5% liquid chlorine, or 2 oz of 68% cal-hypo.

The formula

dose = gallons / 10000 x ppm rise x product factor

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Pool volume15000 gal
  • Current free chlorine1 ppm
  • Target free chlorine3 ppm
  • ProductLiquid chlorine 12.5%

Result

  • Dose needed32.1 fl oz
  • In cups / pounds4.01 cups
  • Chlorine rise2 ppm
  • Shock dose (to 10 ppm)1.25 gallons of liquid chlorine

How to use the Pool Chlorine Calculator

  1. 1Test the water and enter the current free chlorine reading.
  2. 2Set your target - 2 to 4 ppm for most pools, higher if cyanuric acid is high.
  3. 3Add the dose with the pump running and re-test after an hour of circulation.

Frequently asked questions

Why does my chlorine disappear so fast?

Usually low cyanuric acid (no UV protection), high bather load or an algae bloom eating the chlorine as fast as you add it.

Liquid chlorine or tablets?

Tablets are convenient but add cyanuric acid every time. Liquid chlorine adds none, which is why most pool pros use it in summer.

About this calculator