Construction & Materials

Pool Chemical & Dosing Calculator

Calculate exact pool chemical dosages for chlorine shock, pH rise/lower, and alkalinity balancing.

Reviewed by Elena Rostova, P.E. (P.E., M.S. Civil Engineering (Georgia Tech))

Verified for accuracy•Updated 2026

Interactive Calculator

1. Provide Details

Pool Volume (Gallons)

gal

Current Free Chlorine (ppm)

ppm

Target Free Chlorine (ppm)

ppm

2. Output Results

12.5% Liquid Pool Shock Needed47.3 fl oz

65% Cal-Hypo Granular Shock9.0 oz (dry)

How to Calculate: Formula & Steps

Uses standard pool water treatment ratios per 10,000 gallons of water volume.

Formula Used:Liquid Bleach (oz) = (Target FC - Current FC) × Pool Gallons / 10,000 × 10.5 oz

Step-by-Step Calculation Example

Raising Free Chlorine by 3 ppm in a 15,000 gallon pool requires approx 47 fl oz of 12.5% liquid pool shock.

Common Mistakes to Avoid

Adding acid and chlorine simultaneously, which produces toxic chlorine gas fumes.

Practical Use Cases

Weekly pool water balancing
Clearing cloudy green pool algae outbreaks

Expert Tips

Always add chemicals to water (pour into pool deep end), never pour water onto concentrated dry chemicals.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.