Use the free Bra Size Calculator on ToolVexa to find a starting bra size from underbust and bust measurements in inches.
How to Use
Enter your underbust and bust measurements in inches, then press Calculate.
Formula in Plain Words
Round the underbust to the nearest even number for the band. Subtract the band from the bust, rounded to whole inches, to get the cup difference: 0 = AA, 1 = A, 2 = B, 3 = C, 4 = D, and so on.
Worked Example
With underbust 32 inches and bust 36 inches, the band is 32 and the difference is 4, so the starting size is 32D.
FAQs
Is this an exact size?
No. It gives a starting size; brands and styles can fit differently, so try nearby sizes too.
Should I measure over clothing?
Measure over a light, unpadded bra or without a bra, standing straight, for the most useful starting point.
What if the bust is smaller than the band?
Check the measurements, because the bust should be at least as large as the underbust.