Chlorine Dosage Calculator

Calculate the exact amount of chlorine to add to your pool based on your current and desired free chlorine levels.

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How It Works

Free chlorine is your pool primary sanitizer, killing bacteria, viruses, and algae. The ideal range is 1-3 ppm for daily swimming, with 2-4 ppm recommended during heavy use. Shock treatment means raising chlorine to 10+ ppm to break down combined chlorine (chloramines) that cause the classic chlorine smell and eye irritation. Shock your pool weekly during swim season, after heavy rain, or whenever combined chlorine exceeds 0.5 ppm. Always shock at dusk — sunlight destroys chlorine rapidly. Do not swim until free chlorine drops below 5 ppm.