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Pool Chlorine Dose Calculator

Calcium hypochlorite needed to raise free chlorine.

Compute the ounces of 65% calcium hypochlorite (cal-hypo) needed to raise the free chlorine in a pool by a target ppm.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

gal
ppm

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Ounces of 65% cal-hypo = pool gallons × ppm rise × 0.00002.

In depth

Compute the ounces of 65% calcium hypochlorite (cal-hypo) needed to raise the free chlorine in a pool by a target ppm.