How to Calculate percentage if mix ratio is known

Divide 1 by the total number of parts (water + solution). 

For example, if your mix ratio is 8:1 or 8 parts water to 1 part solution, there are (8 + 1) or 9 parts.  The mixing percentage is 11.1% (1 divided by 9).

Need another example?

If your mix ratio is 4:1 or 4 parts water to 1 part solution, there are (4 + 1) or 5 parts.  The mixing percentage is 20% (1 divided by 5).

How to Calculate Mix ratio if percentage is known

(100 - the percentage): percentage 

For example, if your percentage is 4%, take 100 - 4 (which is 96), so your mix ratio is 96:4 which can then be reduced to 24:1.

Need another example?  

If your percentage is 10%, take 100 - 10 (which is 90), so your mix ratio is 90:10 which can then be reduced to 9:1.

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