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Pool Spa Chlorine PPM Dose Calculator

Chlorine dose from volume, target ppm, and % active.

Calculates the weight of chlorine product needed to raise pool or spa water to a target free-chlorine ppm from volume and product concentration.

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Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

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

oz ≈ Volume(gal) × Δppm × 0.00013 / (%Cl/100)

In depth

Calculates the weight of chlorine product needed to raise pool or spa water to a target free-chlorine ppm from volume and product concentration.