Get the exact amount of chlorine to add based on your pool size and current free chlorine level.
Results
Pool Volume16,830gallons
Chlorine Deficit2.0ppm to raise
Liquid chlorine needed37.0fl oz
How to use this calculator
1Enter your pool shape and dimensions.
2Test your water with a strip or liquid kit and enter the current free chlorine reading.
3Set your target — 3 ppm for daily maintenance, 10+ ppm for shock treatment.
4Select the type of chlorine you have on hand.
5Add chlorine in the deep end with the pump running.
Common questions
Maintain 1–3 ppm for daily swimming. Below 1 ppm and the water is under-sanitized. Above 5 ppm is irritating to eyes and skin. After heavy rain or a pool party, levels can drop fast.
Liquid chlorine raises free chlorine immediately with no added stabilizer — best for shock. Tablets release slowly and contain stabilizer — better for daily maintenance. Most pool owners use both.
UV destroys unprotected chlorine within hours. If your cyanuric acid (stabilizer) is below 30 ppm, chlorine burns off rapidly. Check your CYA level before adding more chlorine.
Shock when free chlorine drops below 1 ppm, after heavy rain, after a large gathering, or weekly during peak season. Wait until chlorine returns below 3 ppm before swimming.