Enter your Stock Bleach Concentration, Desired Concentration, and Total Solution Volume to find exactly how much Bleach and Water to mix — the Bleach Dilution Calculator also shows your Actual Final Concentration and Dilution Factor, so you're never guessing whether your solution is strong enough (or too strong).
Bleach Amount Needed
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Water Amount Needed
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Actual Final Concentration
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Dilution Factor
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Check the label on your bleach bottle for the sodium hypochlorite percentage. Most household bleaches range from 3-6%. Commercial bleaches can be higher at 10-12%.
Use 50-100 ppm for food contact surfaces, 100-200 ppm for general disinfection, 200-500 ppm for heavily soiled areas, and 1000+ ppm for mold remediation or emergency water treatment.
Use the formula C1×V1 = C2×V2, where C1 is stock concentration, V1 is bleach volume needed, C2 is target concentration, and V2 is final volume. Always add bleach to water, never water to bleach.
Diluted bleach solutions lose effectiveness quickly. Use within 24 hours for best results, and store in a cool, dark place. Fresh solutions are most effective for disinfection.
Always wear gloves and eye protection, work in a well-ventilated area, and never mix bleach with ammonia, acids, or other cleaners. Always add bleach to water, not the reverse.
This calculator works for basic pool chlorination, but pools require specific pH balancing and ongoing maintenance. Consult pool supply professionals for comprehensive water treatment.
PPM (parts per million) is used for very dilute solutions, while percentage is for concentrated solutions. 1% equals 10,000 ppm. Most disinfection uses ppm measurements.
For safety and effectiveness, measure bleach and water as accurately as possible. Small errors in bleach amount can significantly affect disinfection power or safety.