AMAB weighted profile selected

Bra Size Calculator for Trans Women with Six Measurements

Measure the ribcage and bust in six positions to get a private starting size, with the AMAB weighted profile selected by default and other profiles still available.

Six-measurement methodExample measurements

A Bra That Fits size calculator

How precisely should I read the measuring tape?

Record each value to the nearest 1/8 inch when the tape is clearly marked, or the nearest 1/4 inch when it is not.

Keep the tape level and read where the zero end meets the scale.
Do not twist the tape, compress breast tissue or mix inches and centimeters.
Retake a value that changes when you check the tape in a mirror.

01Underbust measurementsLoose underbustTape resting lightly around the ribcageinSnug underbustComfortably snug, as a band should feelinTight underbustAs tight as possible on a full exhalein

02Bust measurementsStanding bustAround the fullest point while standinginLeaning bustAround the fullest point while leaning 90°inLying bustAround the fullest point while lying downin

Sizing system

Calculation profile

AFABAMABNot listed

How trans women can measure for a starting bra size

Take loose, snug and tight measurements around the ribcage where the band will sit. Then measure the fullest bust circumference while standing, leaning forward and lying down. Keep the tape level and avoid compressing breast tissue.

What the AMAB bra calculation profile changes

The selected profile uses a weighted average of standing, lying and leaning bust measurements. It is one estimation option, not an identity test or a rule for every trans woman. Compare adjacent cup sizes and switch profiles when your real fit history points elsewhere.

How to measure when using breast forms or padding

Wear the exact forms or padding in their intended position when taking the bust measurements. Treat the result as a frame and band starting point, then confirm cup compatibility with the form maker and the bra brand. This calculator does not choose a breast-form volume or provide medical guidance.

Why the calculated size is a starting point

Chest width, tissue distribution, breast forms, cup shape and brand grading can all change the final fit. Test the band independently, scoop tissue fully into the cups and compare one cup or one sister size at a time.