Pool Chemical Calculator
Calculate how much chlorine, pH balancer, alkalinity increaser, and shock treatment to add to your pool. Enter pool volume and current chemical levels for exact dosing.
gal
ppm
ppm
Liquid Chlorine Needed (12.5%)
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Granular Chlorine Needed —
Shock Treatment (Cal-Hypo) —
Extended More scenarios, charts & detailed breakdown ▾
Liquid Chlorine (fl oz)
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Granular (lbs) —
Professional Full parameters & maximum detail ▾
$
Chemicals to Add
Liquid Chlorine Needed —
Muriatic Acid Needed —
Baking Soda for Alkalinity —
Calcium Chloride Needed —
Cost & Summary
Est. Weekly Treatment Cost —
Summary —
How to Use This Calculator
- Enter your pool volume in gallons (use our Pool Volume Calculator if needed).
- Enter your current chlorine level from a test kit.
- Set your target chlorine level (1–3 ppm recommended).
- Results show liquid chlorine in fl oz and granular in lbs to add.
- Use pH Balance tab to calculate acid or soda ash needed.
- Use Full Chemical Checklist to review all 4 key parameters.
Formula
Liquid chlorine (fl oz) = ppm needed × (gallons ÷ 10,000) × 12
Granular chlorine (lbs) = ppm needed × (gallons ÷ 10,000) × 0.125
Example
Example: 15,000 gal pool, current Cl = 1.0, target = 3.0 ppm. Need to raise by 2.0 ppm. Liquid chlorine = 2.0 × 1.5 × 12 = 36 fl oz.
Frequently Asked Questions
- To raise chlorine by 1 ppm in a 10,000 gallon pool, add about 12 fl oz of liquid chlorine (12.5%) or 0.125 lbs of granular chlorine (65%). Always test and adjust incrementally.
- The ideal free chlorine level is 1–3 ppm. Below 1 ppm risks algae growth; above 4 ppm can irritate skin and eyes. Shock treatment raises chlorine to 10+ ppm briefly to kill bacteria.
- Pool water should be between pH 7.2–7.6. Below 7.2 causes corrosion and eye irritation; above 7.8 reduces chlorine effectiveness and causes scale buildup.
- Add shock (calcium hypochlorite or sodium dichlor) to raise chlorine to 10 ppm. For a 10,000 gallon pool, use about 1 lb of shock. Shock at dusk and run the pump overnight.
- CYA is a chlorine stabilizer that protects chlorine from UV degradation. Ideal level is 30–50 ppm for outdoor pools. Too high (>80 ppm) reduces chlorine effectiveness even at normal levels.