Pool Chlorine Calculator
How much chlorine to add to your pool.
Add
26.0 fl oz (0.20 gallons)
to raise free chlorine by 1 ppm
Free chlorine targets
- 1 to 3 ppm: normal range
- 3 to 5 ppm: high bather load or after rain
- 10+ ppm: shock (after pool party, algae, or weekly maintenance)
- Cyanuric acid (stabilizer): keep at 30 to 50 ppm; low CYA needs less chlorine
Cal hypo raises calcium hardness over time. Trichlor and dichlor raise cyanuric acid. Liquid chlorine is just sodium hypochlorite + water and only adds salt. Test chlorine and pH before each adjustment.
About
Enter your pool gallons, target ppm change, and the chlorine source you're using (liquid, cal hypo, trichlor, dichlor). Returns the exact dose in fluid ounces or pounds.
How to use
- Enter pool gallons.
- Pick goal (raise 1 ppm, shock to 10 ppm, etc).
- Pick chlorine source.
FAQ
Liquid vs tablets?+
Liquid (sodium hypochlorite) only adds salt and breaks down quickly. Trichlor and dichlor pucks raise cyanuric acid (stabilizer). Cal hypo raises calcium hardness. Rotate or pick what your water needs.