How to get flange size correctly?

Danni

So I’ve been trying to figure out my nipple size to get the correct flange size and I’m having a hell of a time doing it. I get 11-13 mm equals out to 24 mm but I I get 1 mm for my size and I know I’m doing aiming wrong I just don’t know where. I’m not good with the pregnancy/ breastfeeding math.

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