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How does this online calculator calculate water and concentration amount from final volume ? (lemm.ee)

submitted 1 month ago by x4740N@lemm.ee to c/math@lemmy.ml

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Calculator: https://www.omnicalculator.com/everyday-life/dilution-ratio

If I type in the dilution ratio and final volume it calculates the concentrate amount and water amount but I don't know how it does that and want to find out how it does that

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[–] remotelove@lemmy.ca 8 points 1 month ago* (last edited 1 month ago)

Using simple numbers can help determine an unknown formula, sometimes. While there are easier formulas I am sure, I am just going to "reverse engineer" this one with the data I have.

In that example, I have a 2:1 ratio (3 parts total) with a final volume of 10fl/oz.

10floz / 3 parts is ~3.3 per part. 2 * 3.3 = 6.6, 1 * 3.3 = 3.3

6.6 + 3.3 = 9.9 (close enough..)

So, what we do is determine what is "one part" of the mixture, and then do some basic math on the given ratio.