Find your perfect fit in seconds. Accurate calculations for US, UK, and European sizing standards based on your measurements.
Fit Check: The band should be snug but comfortable on the loosest hook. The cup should contain all breast tissue without spilling over.
For the best results, measure yourself while wearing a non-padded underwire bra or no bra at all. Use a soft measuring tape.
Exhale and measure snugly around your ribcage, directly under your bust.
Measure loosely around the fullest part of your bust (usually nipple level).
If a cup fits but the band is tight, go up a band size and down a cup size. This is your "sister size". For example, 34C is a sister size to 36B.
Different brands use different starting points for their patterns. This calculator uses the most common international standard.
It's recommended to measure every 6-12 months, or after any significant weight change or pregnancy.
