Parts per Million (PPM) Chemical Dilution Formulas

When calculating the amount of concentrated disinfectant or sanitizer that is needed to get the job done, it’s important to know the parts per million (PPM) of “actives” (active ingredients). This is also helpful when using products with enzymes.

How to Convert Parts per Million (PPM) to Percent

1% = 1/100, 1PPM = 1/1000000, so 1PPM = 0.0001%

To convert from PPM to percent, divide the PPM by 10000:

x(%) = x(PPM) / 10000

For example, to find how many percent are in 300PPM:

x(%) = 300ppm / 10000 = 0.03%

How to Convert Percent to Parts per Million (PPM)

1% = 10000PPM.

So, x(PPM) = 10000 · x(%)

For example to find how many PPM are in 1.7%.

x(PPM) = 10000 · 1.7% = 17000PPM

This Will Make Your Head Hurt

When PPM is used to measure chemical concentration, it is usually in a solution of water. Solute concentration of 1 PPM is solute concentration of 1/1000000 of the solution.

The concentration C in PPM is calculated from the solute mass msolute in milligrams and the solution mass msolution in milligrams .

C(PPM) = 1000000 × msolute / (msolution + msolute)

Usually the solute mass msolute is much smaller than the solution mass msolution.

msolute ≪ msolution

Then the concentration C in PPM is equal to 1000000 times the solute mass msolute in milligrams (mg) divided by the solution mass msolution in milligrams (mg):

C(PPM) = 1000000 × msolute (mg) / msolution (mg)

The concentration C in PPM is also equal to the solute mass msolute in milligrams (mg) divided by the solution mass msolution in kilograms (kg):

C(PPM) = msolute (mg) / msolution (kg)

When the solution is water, the volume of mass of one kilogram is approximately one liter.

The concentration C in PPM is also equal to the solute mass msolute in milligrams (mg) divided by the water solution volume Vsolution in liters (l):

C(PPM) = msolute (mg) / Vsolution (l)

We’re Scientists but, We’re Confident We Know a Little More About This Than Our Competition

It is very important to know how to calculate parts per million if you work in healthcare, childcare, eldercare or handle food and beverages. It’s equally as important to choose the proper chemical for your application!

Contact us to discuss your situation. We can help!