When should I shock my pool?

Shock weekly during heavy use, after heavy rain, when water looks cloudy, after a pool party, or when chlorine levels won't hold. Always shock in the evening to prevent UV degradation.

How do I calculate my pool volume?

Rectangular: Length × Width × Average Depth × 7.5. Round: Diameter × Diameter × Average Depth × 5.9. Oval: Length × Width × Average Depth × 5.9.

Why does chlorine type matter?

Different chlorine products have different concentrations of available chlorine. Liquid is typically 12.5%, granular shock 65%, and tablets 90%. Using the wrong amount can under or over-chlorinate your pool.

Household+ Chart

Pool Chlorine Calculator

Calculate the exact amount of chlorine needed for your pool. Supports liquid chlorine, granular shock, and chlorine tablets with pool volume in gallons or liters.

Pool Chlorine

Calculate the exact amount of chlorine needed for your pool. Supports liquid chlorine, granular shock, and chlorine tablets with pool volume in gallons or liters.

Pool VolumeTotal water volume of your pool

Current Chlorine LevelTest your pool water to find current level

ppm

Target Chlorine LevelIdeal range: 1-3 ppm for regular use, 10+ ppm for shock

ppm

Chlorine TypeSelect your chlorine product type

Always follow manufacturer instructions for your specific chlorine product. Test water after adding chemicals and before swimming.

Important Disclaimer

Always follow manufacturer instructions for your specific chlorine product. Test water after adding chemicals and before swimming.

About This Calculator

Maintaining proper chlorine levels is essential for a safe, clean swimming pool. This calculator helps you determine exactly how much chlorine to add based on your pool size, current levels, and the type of chlorine product you're using.

How It Works

Enter your pool volume, test your current chlorine level, set your target level, and select your chlorine type. The calculator determines the exact amount needed, accounting for the concentration of different chlorine products.

Frequently Asked Questions

For regular swimming, maintain 1-3 ppm (parts per million). The CDC recommends at least 1 ppm for proper sanitation. For shock treatment, temporarily raise to 10+ ppm.

Clinical Review

Dr. Igor I. Bussel, MD

Board-Certified Ophthalmologist

Dr. Igor I. Bussel is a board-certified ophthalmologist and fellowship-trained surgeon affiliated with the University of California, Irvine (UCI), the Gavin Herbert Eye Institute, and the UCI School of Medicine.

Last Updated: 2026-01-06

Sources & Guidelines

CDC Healthy Swimming - Chlorine and pH.
Pool & Hot Tub Alliance. "Basic Pool Chemistry."

Medically Reviewed

Evidence-Based

Updated 2026-01-06

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References

Last updated: 2026-01-06