First of all you need to measure around like you did but include your breasts in that measurement and see how many cm that is.
I already know that I'm a 34C and I came up with 70cm when I measured under my breasts like you did. I also measured with my breasts included and it was 86cm which almost equals 34in.
I also found this website that could be useful for you with converting measurements::
http://www.megaconverter.com/Mega2/index.html
If you need more help let us know
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