Liquid Chlorine Pool Calculator
Enter your pool size, your chlorine reading and the strength on the jug to see exactly how much to pour.
Updated November 2026
How Much Liquid Chlorine Does a Pool Need?
About 10.5 fluid ounces of 12.5% liquid chlorine per 10,000 gallons raises free chlorine by 1 ppm. A 15,000 gallon pool going from 1 to 4 ppm needs about 47 fluid ounces, roughly a quart and a half.
Weaker products need more. With 10% chlorine use about a quarter more, and with plain 6% bleach about twice as much.
Liquid Chlorine Dosing Chart
12.5% liquid chlorine needed by pool size and how far you are raising free chlorine:
| Raise chlorine by | 10k gal | 15k gal | 20k gal | 25k gal | 30k gal |
|---|---|---|---|---|---|
| 1 ppm | 10.5 fl oz | 16 fl oz | 21 fl oz | 26 fl oz | 31.5 fl oz |
| 2 ppm | 21 fl oz | 31.5 fl oz | 42 fl oz (1.3 qt) | 52 fl oz (1.6 qt) | 63 fl oz (2 qt) |
| 3 ppm | 31.5 fl oz | 47 fl oz (1.5 qt) | 63 fl oz (2 qt) | 79 fl oz (2.5 qt) | 94 fl oz (3 qt) |
| 5 ppm | 52 fl oz (1.6 qt) | 79 fl oz (2.5 qt) | 105 fl oz (3.3 qt) | 1 gal | 1.2 gal |
| 10 ppm | 105 fl oz (3.3 qt) | 1.2 gal | 1.6 gal | 2.1 gal | 2.5 gal |
For 10% chlorine multiply by 1.25. For 6% bleach multiply by about 2. Jugs lose strength as they age, so retest after adding.
How much do I need at each strength?
| Product | To raise 10,000 gallons by 1 ppm |
|---|---|
| 12.5% pool chlorine | 10.5 fl oz |
| 10% pool chlorine | 13 fl oz |
| 8.25% bleach | 16 fl oz |
| 7.5% bleach | 17.5 fl oz |
| 6% bleach | 22 fl oz |
Check the label for the percent of sodium hypochlorite. Use only plain, unscented bleach with no thickeners or splash guard additives.
How do I add liquid chlorine?
- Test free chlorine and know your pool volume. The volume calculator helps if you are unsure.
- Add it in the evening. Sunlight burns off unprotected chlorine within hours.
- Pour slowly in front of a return jet with the pump running, close to the water so it does not splash.
- Keep it off clothes and liners. Do not pour it on steps or let it pool on a vinyl floor.
- Retest after 30 minutes of circulation.
How much chlorine should I add each day?
A pool in summer sun typically uses 1 to 3 ppm of chlorine a day. Test in the evening, see how far you are below your target and add enough to get back to it. For a 15,000 gallon pool, 2 ppm is about a quart of 12.5% chlorine.
Your target depends on stabilizer. With 30 to 50 ppm of stabilizer, keep free chlorine at 2 to 4 ppm. Without stabilizer the chlorine will not last through the day: the stabilizer calculator shows how much to add.
Clearing algae needs a much higher level, held until the water is clear. Use the shock calculator for that.
Frequently Asked Questions
How much liquid chlorine for a 10,000 gallon pool?
About 10.5 fluid ounces of 12.5% liquid chlorine raises a 10,000 gallon pool by 1 ppm. To raise it 3 ppm, add about 32 fluid ounces, or one quart.
Can I use household bleach in my pool?
Yes, if it is plain, unscented bleach with no additives. It is the same chemical as pool chlorine at a lower strength, so you need more of it.
How long after adding liquid chlorine can I swim?
After a normal daily dose, about 30 minutes with the pump running. After a large dose, wait until free chlorine tests at 4 ppm or below, the re-entry limit printed on liquid chlorine labels.
Does liquid chlorine raise pH?
It raises pH a little when added, and pH comes back down as the chlorine is used up. The net effect is close to neutral.
How long does liquid chlorine last in the jug?
It weakens with heat, sunlight and time. Buy liquid chlorine fresh, store it cool and dark, and use it within a few weeks in summer.
Sources
- EPA: accepted label for 12.5% sodium hypochlorite pool chlorine (Reg. No. 42052-20001)
- CDC: Home pool and hot tub water treatment and testing
- CDC: Pool chemical injuries and how to prevent them (MMWR, 2019)
Green or cloudy? Shock it instead
A normal dose will not clear algae. The shock calculator gives the level for your stabilizer reading.
Related: Stabilizer calculator · Chart for small pools · When it is safe to swim