Pool Chlorine Calculator
Calculate exactly how much granular or liquid chlorine to add to your pool based on volume, current level, and target level.
Pool Details
Recommended: 2–4 ppm for residential pools
Dosage Result
Fill in the details and click Calculate to see results.
Also equals
Chlorine needed
Pool volume
Delta (ppm)
Quick Reference
| Level (ppm) | Status | Action |
|---|---|---|
| 0 – 0.9 | Unsafe | Shock immediately |
| 1 – 1.9 | Low | Add chlorine |
| 2 – 4 | Ideal | Maintain |
| 4 – 10 | High | Let it drop naturally |
| > 10 | Too High | Do not swim; dilute |
Summary
Calculate exactly how much granular or liquid chlorine to add to your pool based on volume, current level, and target level.
How it works
- Enter your pool volume in gallons or liters.
- Input your current free chlorine reading (from a test kit or strips).
- Set your target chlorine level (typically 2–4 ppm for residential pools).
- Select chlorine type: granular (65% calcium hypochlorite) or liquid bleach (10%).
- Click Calculate to see how much product to add.
- The result updates instantly; re-test after 30 minutes of circulation.
Use cases
- Shock a pool after heavy rain or a pool party.
- Bring chlorine levels up after a low test-kit reading.
- Calculate chemical dosage for a newly filled pool.
- Determine liquid bleach equivalent to a granular chlorine dose.
- Plan chemical purchases before the swimming season.
- Maintain safe sanitizer levels for above-ground or in-ground pools.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu