Free pool chemistry calculator
Enter your readings. Get the exact amount to add — from the same engine as the app.
Your plan
Example — 20,000 gal plaster pool
- Free chlorine
- 0.5 ppm
- Stabilizer (CYA)
- 60 ppm
- pH
- 7.5
Add 166.5 fl oz of Liquid Chlorine 10%
Free chlorine 0.5 ppm → 7 ppm, because 60 ppm of stabilizer raises the target.
20,000 gal × 6.5 ppm ÷ 10% → 166.5 fl ozThat is the whole calculation — your pool’s volume, how far the reading has to move, and the strength of the product. Where our numbers come from →
Put your own readings in on the left and tap “Get my plan” to replace this with yours.
That dose is real — the same deterministic engine the app runs, same answer every time.