Bra Size Calculator

Specialized sizing logic for AMAB body types, breast forms, and proportional aesthetics.

Sizing Tool

How are you measuring today?

Bra sizing for AMAB (assigned male at birth) bodies depends on whether you already have breast projection or if you are starting flat and looking to buy forms.

Instruction: Wear your forms/padding while doing this. Measure your Underbust firmly against your ribcage just below the forms. Measure your Bust loosely around the fullest part of your forms.

Photo Guide

1. Underbust

2. Fullest Bust

Underbust

Bust (Over forms)

Please enter valid measurements (Bust must be larger than Underbust).

1. Your Underbust Measurement

Measure firmly around your ribcage, exactly where the bra band will sit.

1. Underbust

2. What kind of look do you want to achieve?

Subtle / A Cup

Barely there, easy to hide under a shirt, very small projection.

Natural / B Cup

A soft, natural feminine look that suits most everyday outfits.

Feminine / C Cup

A clear, noticeably feminine chest shape. Great for dresses.

Fuller / D Cup

Obvious, dramatic curves and significant projection.

I'm not sure, suggest based on my frame

Calculates a proportional cup size based on your shoulder width.

Shoulder Width

Measure straight across your back, from one shoulder bone to the other.

Please fill out all required measurements.

Your Recommended Size

38B

Based on your measurements, this is your optimal US/UK bra size.

Shopping Tips:

Sister Sizes: If the band is too tight, try 40A. If it's too loose, try 36C.

Due to wider ribcage, you may experience cup gaping. Look for 'demi-cup' or 'balconette' style bras.

Bra Size Calculator

Sizing Tool

How are you measuring today?

I Have Projection

I am Flat Chested