Bleach Dilution Calculator

By Łucja Zaborowska, MD
Last updated: Sep 21, 2020

The bleach dilution calculator will tell you exactly how much bleach and water you need to mix to create a mixture of your choice.

With a little help from our bleach to water ratio calculator, you will easily get the bleach disinfectant dilution in all the units you can think of. US flag emojiEuropean flag emojiuk flag emoji India flag emoji

Read the article below to learn what the proper dilution of bleach for disinfecting is and discover how to count how much bleach to water you need.

How to dilute bleach?

The bleach dilution you need depends mostly on its application - what do you want to use it for?

  • Are you trying to disinfect areas meant for food preparation? 🔪
  • Are you a proud pool owner? 🏊
  • Would you like to make your water safe in case of an emergency? 🚰

In the few next paragraphs, we will supply you with the bleach solution ratio needed in all these situations - along with the most popular bleach dilution ratio charts.

Before you proceed, read the following precautions:
Never mix bleach with other cleaners, vinegars, ammonia, or acids.
• Try not to inhale the bleach fumes. Make sure to perform your duties in a well-ventilated room.
• Use personal protection such as gloves, thick clothing, and goggles.
• Always read and follow the instructions on the product container.
Be careful, you're handling a toxic substance.

Disinfection & cleaning with bleach

  • Recommended bleach type: unscented, 5-6% concentration

  • General advice: Wash your surfaces with hot water and soap first, then sanitize them with bleach.

Bleach dilution chart for surface disinfection:

Area/ItemBleach amountWater amount
Food surfaces1 tablespoon (0.5 fl oz/ 15 mL)1 gallon (3.8 L)
Non-food surfaces1 cup (8 fl oz/ 240 mL)5 gallons (18.9 L)
Cans with foods1 cup (8 fl oz/ 240 mL)5 gallons (18.9 L)
Mold growth1 cup (8 fl oz/ 240 mL)1 gallon (3.8 L)

Our bleach PPM calculator uses information from the Center for Disease Control and Prevention (CDC). Visit their website for more details.

Pool disinfection

  • General advice: Use your chlorine bleach daily. Use the bleach stabilizer (cyanuric acid) once a month - a portion of 45 mg/L (ppm).
Minimum bleach amountTarget bleach amountShock level
3.5 ppm (mg/L)6 ppm (mg/L)18 ppm (mg/L)

We sourced our information from TroubleFreePool/Fix infographic & articles.

Making water safe for drinking

  • Recommended bleach type: 1% concentration of sodium hypochlorite (instructions for 5-6% concentration are also available below)

  • General advice: If the water is a weird color or very cold, double the amount of bleach.

Bleach dilution ratios for disinfecting:

1% Bleach solution

Amount of waterAmount of bleach
1 quart/1 L of water10 drops/ ½ ml/ 1/8 teaspoon of bleach
1 gallon water40 drops/ 2½ ml/ ½ teaspoon of bleach
5 gallons water200 drops/ 12½ ml ml/ 2½ teaspoon of bleach

5-6% Bleach solution

Amount of waterAmount of bleach
1 quart/1 L of water2 drops/ 0.1 ml of bleach/
1 gallon water8 drops/ ½ ml/ 1/8 teaspoon of bleach
5 gallons water40 drops/ 2½ ml/ ½ teaspoon of bleach

Enter the CDC HealthyWater site for more details.

One cup of bleach, two tablespoons of bleach - are you still confused about different units of measurement? Try our volume converter! 🧊

How to calculate bleach and water ratio?

Our bleach dilution calculator uses the following equations:

Amount of bleach needed = Desired concentration of mixture * Desired volume of mixture


  • Amount of bleach needed is given in milligrams (mg);
  • Desired concentration of mixture is given in milligrams per liter or parts per million (mg/L or ppm); and
  • Desired volume of mixture is given in liters (L).

Volume of bleach needed =(Bleach amount needed * 0.00105) * (100/ Bleach concentration)


  • Volume of bleach needed is given in milliliters (mL); and
  • Bleach concentration is given as a percent (%).

If you're still not sure of your container's volume, visit our volume calculator for some less typical shapes. 🛢️

How to use the bleach dilution calculator?

Looking for the perfect Clorox to water ratio? Our chlorine calculator is here to help. You're just three steps away from your solution!

Always add bleach to water, not the other way around!

  1. Enter your bleach concentration.

    The usual solution available in American shops has a concentration of 5-6%.

  2. Enter your desired concentration into our bleach dilution calculator in ppm or mg/L.

    Don't worry - our chlorine calculator offers you plenty of different concentration units!

  3. Enter the desired volume of your mixture.

  4. We got it! Your results are here. 🎉

    Don't forget to choose your desired volume.

Łucja Zaborowska, MD
Bleach concentration
Desired chlorine concentration
Desired chlorine volume
US gal
Required bleach volume
US fl oz
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