Chlorine Tablet Calculator

Enter your pool size and choose whether you want a normal weekly chlorine dose or a heavier dose for hot weather, heavy use, or problem water.

Pool Size (Gallons)

Dosing Level

How many gallons are in my pool?

Not sure how many gallons are in your pool? Enter your pool dimensions in our Pool Size Calculator to estimate your pool size in gallons.

Chlorine Tablets

3" chlorine tablets - 18 lb pail

Slow-dissolving 3-inch tablets — a full week of steady chlorine from one manufacturer's line.

view product

How Many Chlorine Tablets Does Your Pool Need?

Chlorine tablets are one of the easiest ways to maintain safe, clean swimming pool water. Slow dissolving stabilized tablets release chlorine gradually, helping maintain consistent sanitation levels throughout the week.

The typical guideline used by pool professionals is:

1 chlorine tablet per 10,000 gallons of pool water per week.

However, pools may require additional chlorine under certain conditions such as high temperatures, heavy swimmer use, rainstorms, or algae growth.

Chlorine Tablet Dosage Guide

POOL SIZE	TABLETS PER WEEK
10,000 gallons	1 tablet
15,000 gallons	1.5 tablet
20,000 gallons	2 tablet
25,000 gallons	2.5 tablet
30,000 gallons	3 tablet

Hot Summer Temperatures

Heavy Swimmer Usage

Storm Debris And Rain Dilution

Low Chlorine Test Results

Algae Or Cloudy Water

In these cases, pools may require additional chlorine tablets or supplemental pool shock treatment.

Tip: Always test your pool water regularly and adjust chlorine dosing to maintain free chlorine levels between 1-4 ppm.

Not sure whether to use chlorine tablets or pool shock? Learn the key differences between chlorine tablets and pool shock.