Chlorine Dosing Calculator
Specialized calculator for chlorine shock treatments and routine free chlorine maintenance across all major chlorine product types.
How it works
Routine FC: (Target - Current) × Pool Vol ÷ 120000 = dose in lbsShock: Target 10-15 ppmStrength: Liquid 12.5%, Cal-hypo 68%, Dichlor 56%, Trichlor 90%
- You enter
- Pool volume (gallons), current FC (ppm), target FC (ppm), chlorine type (liquid/cal-hypo/dichlor/trichlor), chlorine strength %, CYA level (ppm)
- You get
- Chlorine dose (fl oz or lbs), product bags needed, CYA impact, application notes
How accurate is it? Different forms have different CYA impacts (dichlor/trichlor add CYA); chlorine strength varies by product; effectiveness depends on pH and TA.
These are estimates, not quotes. See How We Estimate.
Worked example
15,000-gallon pool, FC 1 ppm, target 3 ppm, using cal-hypo (68%): (3-1)×15000÷120000 = 0.25 lbs cal-hypo shock needed.
Tap an example above the calculator to see it worked with live numbers.
Reference table
| Product | Per 10,000 gallons | Changes |
|---|---|---|
| Liquid chlorine (12.5%) | 10.2 fl oz | Free chlorine +1 ppm |
| Cal-hypo shock (65%) | 2 oz | Free chlorine +1 ppm |
| Dichlor (56%) | 2.7 oz | Free chlorine +1 ppm |
| Muriatic acid (31.45%) | about 12 fl oz | pH −0.2 (at TA 100) |
| Soda ash | about 6 oz | pH +0.2 (at TA 100) |
| Baking soda | 1.5 lb | Alkalinity +10 ppm |
| Calcium chloride (77%) | 1.25 lb | Calcium hardness +10 ppm |
| Stabilizer (CYA) | 13 oz | CYA +10 ppm |
| Pool salt | 0.83 lb | Salt +10 ppm |
When to use it
Determines exact chlorine amounts for routine maintenance and shock treatments at different CYA levels.
Daily chlorine maintenance, post-storm treatment, pool opening shock, algae prevention, after heavy bather load.