Bra Size & Breast Form Calculator For Men
Our Trans and crossdressing bra size calculator helps you estimate your Australian bra size from your chest measurements and see how different breast form sizes could change your finished cup size.
Measure around your ribcage, directly under your chest.
Measure around the fullest part of your chest.
Choose Your Breast Forms
Select the combined weight of the breast forms you plan to wear.
Estimated Size
without breast forms
Your Size
Estimate only. This calculator provides a starting bra size, not a guaranteed fit. We’ll continue to refine it as we gather more fitting data. Body shape, bra style and breast-form positioning can all affect your best size.
How to Measure Your Bra Size for Crossdressing
1. Underbust
Using a soft measuring tape, measure around your ribcage where your bra band would sit.
2. Overbust
Measure around the fullest part of your chest, generally across your nipple line, keeping the tape level.
3. Breast Forms
Compare several breast form sizes to find a proportion and cup size that suits the look you're trying to achieve.
Need a fitting?
Bra Fittings for Men & Crossdressers in Melbourne
Our experienced fitters can help you compare bra styles and breast form sizes in person, so you can see and feel the difference rather than guessing online.
Our fittings are friendly, discreet and designed to make finding the right size as straightforward as possible.
Bra Size Calculator for Men
Bra sizing can be confusing when you're working from a male chest or broader ribcage because many conventional bra calculators are designed around typical female breast proportions.
Our bra size calculator for men and crossdressers is designed to provide a more useful starting point by considering your underbust, natural chest measurement and the optional addition of breast forms.
It doesn't mean you're limited to one size. Bra fitting is part measurement and part finding the style that works best with your individual body shape.
A Note on Bra Size Calculators
Even with precise measurements and a reliable bra size calculator, you might notice that your calculated size doesn’t always fit perfectly - and there’s a good reason for that. Bra sizing can vary significantly between brands, styles, and even colours within the same brand, making it tricky to rely solely on a calculator.
For instance, one company’s 12C might fit snugly, while another’s feels too loose due to differences in how they cut their patterns, the stretchiness of their fabrics, or the shape of their cups. Even small details, like the width of the straps or the placement of the underwire, can affect fit. This is why lingerie experts recommend getting a professional bra fitting in addition to using a bra calculator. A fitting specialist can assess how a bra sits on your body, check for signs of a poor fit (like straps slipping or cups overflowing), and suggest adjustments tailored to your shape - something no calculator can fully replicate.
Choosing a Bra Size
A well-fitting bra should feel secure around your ribcage without being uncomfortably tight.
If you're wearing breast forms, the cups should comfortably contain the forms without excessive empty space, bulging or movement. The centre and neckline of the bra should also sit neatly against your body wherever the shape of the bra allows.
Choosing Breast Forms
Breast forms come in many sizes, and there isn't a single correct size for every crossdresser. The size you choose depends on your ribcage, height, shoulders, the clothes you plan to wear and, most importantly, the silhouette you prefer.
Smaller forms can create a subtle bust, while larger forms produce greater projection and a fuller appearance.
Your Questions, Answered!
Mens Bra Size FAQs
Here are our most common questions to assist you in finding your perfect fit.
How do I find my bra size as a man?
How do I find my bra size as a man?
Measure firmly around your ribcage directly underneath your chest to find your underbust, then measure around the fullest part of your chest. Enter both measurements into our male bra size calculator to receive an estimated Australian band and cup size.
Is men's bra sizing different from women's bra sizing?
Is men's bra sizing different from women's bra sizing?
The size labels themselves use the same bra sizing system, but body proportions can differ. Men often have different chest shapes, ribcage proportions and breast distribution, which can make some conventional bra calculators less accurate. The style and shape of the bra can also make a significant difference.
How do I know what breast form size I need?
How do I know what breast form size I need?
Start with your natural chest measurements, then use the calculator to compare different breast form weights. Consider whether you want a subtle, proportionate or fuller silhouette rather than focusing only on a particular cup letter.
Do I need to wear breast forms with a bra?
Do I need to wear breast forms with a bra?
No. You can wear a bra without breast forms if that's what you prefer. The calculator can estimate your bra size using your natural chest measurements alone or show how breast forms may change the result.
What type of bra is best for breast forms?
What type of bra is best for breast forms?
Pocketed bras are an excellent option because they help keep breast forms securely positioned. Full-coverage and supportive bras can also work well, depending on the breast form shape and the appearance you're looking for.
Can men get professionally fitted for a bra?
Can men get professionally fitted for a bra?
Absolutely. Illusions Lingerie offers professional bra fittings for men and crossdressers at our Melbourne store. Our team can help with bras, breast forms and other lingerie while providing a comfortable and discreet fitting experience.
Is the calculated bra size guaranteed to fit?
Is the calculated bra size guaranteed to fit?
No calculator can guarantee a perfect fit because bra sizing varies between brands, shapes and styles. Use the result as a starting point and try nearby sizes if necessary.