Disinfectant Dilution Ratio Calculator

Calculate how much concentrated disinfectant and water to mix to achieve your desired working concentration.

Stock Concentration (%) e.g. 5 for 5% bleach

Target Working Concentration (%) e.g. 0.1 for 1000 ppm

Final Volume Needed (mL) Total solution you want to prepare

Formula

Uses the dilution equation C₁V₁ = C₂V₂:

V₁ = (C₂ × V₂) / C₁
V_water = V₂ − V₁

Where:

C₁ = stock (concentrate) concentration (%)
C₂ = desired working concentration (%)
V₁ = volume of concentrate required (mL)
V₂ = total final volume required (mL)

Parts per million (ppm) conversion: ppm = % × 10,000

Assumptions & References

Always add disinfectant to water (not water to disinfectant) to minimise splashing of concentrate.
Reference: WHO (2020) Cleaning and disinfection of environmental surfaces in the context of COVID-19; CDC Guidelines for Disinfection and Sterilization in Healthcare Facilities.

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