The useful question is not “which size is universally right?” It is “which measurements, flow needs, and preferences should I compare before reading the full guide?”
These figures are taken from the supplied MonthlyCup guide summary. Check the live guide for current product presentation and instructions.
Diameter helps compare width. Cup length excludes the stem. Total length includes the stem. Capacity to holes is the listed volume up to the holes near the rim.
The table is useful for comparison, but it is not a personal fitting tool. The MonthlyCup guide advises comparing measurements and individual flow and preferences.
A cup model can look right on paper and still require personal adjustment. Keep the comparison practical and avoid reducing the decision to one single statistic.
Capacity may be relevant to flow, but the highest capacity is not automatically the best choice for every person.
Compare cup length and total length carefully, especially if you are reading multiple product pages that present length differently.
MonthlyCup’s guide includes personal preferences as part of comparison. That keeps sizing from becoming a rigid rule.