How to calculate bleach to water ratio for spray bottle

Bleach is a powerful cleaner that is able to disinfect and sanitise all kinds of surfaces. We use cleaner with water to make a solution. However, have you ever been in the situation that the bleach did work probably as advertised or the solution damaged your facilities? Some kinds of cleaner can be excessively harsh if it doesn’t dilute with a sufficient amount of water. Else, it may be out of function if diluted with too much water. Understanding the necessity  of bleach dilution, Sparkling and Beyond will introduce you with some common-using bleach to water ratio for spray bottle and explain how to calculate the solution for each type of spray bottles. 

What is the dilution ratio?

Dilution ratio is a ratio that indicates how many parts of the concentrated product should be to be diluted to how many parts of the dilutant or extender (usually water or a solvent). For example, 1-ounce to a gallon (128-ounces) would be 1:128, not 128:1. This ratio is different between bleaches. 

Spray bottles (Source: Internet)

Caution: Since bleach can be harmful to your skin, it is better that you do anything with gloves and mask. 

Metric calculations such as liters can also be calculated. You just need to convert the metric figures to gallons or ounces prior to starting. Common metric volume measurements and their English equivalents are listed below:

  • 1 quart = 0.946 mL
  • 1 gallon = 3.785 liters
  • 1 liter = 0.264 gallons
  • 4 liters = 1.056 gallons

How To Calculate Dilution Ratios Of A Spray  Bottle?

Let’s take an example that you want to make a X oz spray bottle with the 1:4 dilution ratio (1 part of chemical and 4 parts of water). X is the maximum amount of liquid that the bottle can contain. Now, you must make clear how much water and chemical should be used in this case. Follow the steps below: 

Step 1: Finding how many parts  we will have when mixing the solution. Let’s move on with the  above example with the measurement unit is ounce, a dilution ratio is  1:4 so we would need 1 part (water) +4 parts (bleach)= 5 parts in total.

Step 2: As you divide  X oz into 5 parts, each part will be X/5 oz. 

Step 3: As the dilution ratio is 1:4

=> the water you need: 4 * X/5 = 4X/5
=> the chemical you need: 1 *X/5 = X/5

Cleaning with bleach (Source: Internet)

There are some common volume of spray bottle. With our above instructions, you may now calculate and make a solution  by yourself. If you have not clearly understand the recipe, let check another example: 

Bleach to water ratio for 32 oz spray bottleWith the dulition ratio of 1:4: 32/5 = 6.4 oz/partWater needed: 4 * 6.4 = 25.6 ozBleach needed: 1 * 6.4 = 6.4 oz=> Total: 25.6 + 6.4 = 32 ozBleach to water ratio for 12 oz spray bottleWith the dulition ratio 1: 512/6 = 2 oz/partWater needed: 5*2 = 10 ozBleach needed: 1 * 2 = 2 oz=> Total: 10 + 2 = 12 oz
Bleach to water ratio for 24 oz spray bottleWith the dulition ratio: 1:424/5 = 4.8 oz/partWater needed: 4*4.8 = 19.2 ozBleach needed: 1 * 4.8 = 4.8 oz=> Total: 19.2 + 4.8 = 24 ozBleach to water ratio for 16 oz spray bottleWith the dulition ratio: 1:416/5 = 3.2 oz/partWater needed: 4 * 3.2 = 12.8 ozBleach needed: 1 + 3.2 = 3.2 oz=> Total: 12.8 + 3.2 = 16 oz
Bleach to water ratio for 28 oz spray bottleWith the dulition ratio: 1: 428/5 = 5.6 oz/partWater needed: 4 * 5.6 = 22.4 ozBleach needed: 1 * 5.6 = 5.6 oz=> Total: 22.4 + 5.6 = 28 ozBleach to water ratio for 25 oz spray bottleWith the dulition ratio: 1:425/5 = 5 oz/partWater needed: 4*5 = 20 ozBleach needed: 1*5 = 5 oz=> Total: 20 + 5 = 25 oz
  • How To Calculate Dilution Ratios Of Gallon Containers: Basically, a gallon is 128oz. The process is exactly the same as the 32 oz way.

A common mistake in calculating how much diluted bleach will result from a fixed ratio is forgetting to add the amount of the concentrate to the total. For example, 1-ounce of a product diluted at 1:64 makes 65-ounces, not 64. This includes not only the 64-ounces of dilutant, but also the original 1-ounce of concentrate.


Sanitising products with a variety  of dilution ratios may make failure if used indiscriminately. Being aware of how to calculate bleach to water ratio for spray bottle properly is a must for people who choosing bleaches  to sanitise  or disinfect your home facilities. However, mixing chemical seems not an easy task for every one. if you are not familiar with this, why don’t you give Sparkling  and Beyond a call for further help. You may find many helpful cleaning tips for your house on our website that have been studied carefully and are now being practised by our excellent cleaning service department including house cleaning, office cleaning, AirBnB cleaning, etc. Our enthusiastic staff always desire for helping many people stay away from boring household chores so we are always willing to handle your chore at any time so feel free to contact us.

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