Pool Chemical Calculator

Calculate exact chemical amounts needed to balance your pool water. Enter current and target levels for chlorine, pH, alkalinity, and CYA (stabilizer). Supports pool volume calculation from dimensions. Includes chemical safety notes.

Pool Volume (gallons)

Water Chemistry Levels

Parameter	Current	Target	Ideal Range
Free Chlorine (ppm)			1-3
pH Level			7.2-7.6
Total Alkalinity (ppm)			80-120
CYA / Stabilizer (ppm)			30-50

Include shock treatment (super-chlorination)

Chemical Dosages for 15,000 gallon pool

Liquid Chlorine (12.5%)

Add to increase

4.9

fl oz

Add to water in evening. Never mix with acid. Wait 30 min before swimming.

pH Down (Muriatic Acid)

Add to decrease

60.0

fl oz (3.7 lbs)

Wear gloves and eye protection. Pour slowly into deepest end. Never add water to acid.

Alkalinity Up (Sodium Bicarbonate)

Add to increase

96.3

oz (6.0 lbs)

Broadcast across surface with pump running. Do not add more than 1.5 lbs per 10k gal at a time.

Stabilizer (Cyanuric Acid)

Add to increase

39.0

oz (2.4 lbs)

Dissolve in warm water in a sock/bag placed in skimmer. Takes 3-7 days to fully dissolve.

Chemical Safety Guidelines

!!NEVER mix chlorine with acid. Produces toxic chlorine gas.
!!Always add chemicals to water, never water to chemicals.
!!Wear gloves and eye protection when handling pool chemicals.
!!Add chemicals one at a time with at least 30 minutes between additions.
!!Store chemicals in a cool, dry place away from sunlight and each other.
!!Retest water 4-24 hours after adding chemicals before swimming.

How to Use Pool Chemical Calculator

1Enter pool volume or calculate from dimensions
2Input current chemical levels
3Set target levels
4View exact chemical amounts needed

Frequently Asked Questions

What should pool chemical levels be?▾

Ideal ranges: Free chlorine 1-3 ppm, pH 7.2-7.6, Total alkalinity 80-120 ppm, Cyanuric acid (CYA) 30-50 ppm. Test water 2-3 times per week during swimming season and after heavy rain or high bather load.

How much chlorine does my pool need?▾

To raise free chlorine by 1 ppm in a 20,000 gallon pool: add about 2.5 oz of calcium hypochlorite (granular shock) or 10 oz of liquid chlorine (sodium hypochlorite 12.5%). Always add chemicals to water, never water to chemicals.

How do I lower pool pH?▾

To lower pH by 0.2 points in a 15,000 gallon pool, add about 12-16 oz of muriatic acid or 1 lb of dry acid (sodium bisulfate). Always add acid to water slowly, with the pump running. Retest after 4 hours of circulation.

About Pool Chemical Calculator

NexTool's Pool Chemical Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.