Quick Answer: Finding the right bra after mastectomy depends on three things:
- Your surgery type (unilateral, bilateral, lumpectomy, reconstruction)
- Your recovery stage (0–6 weeks through 1+ years)
- Your measurements and prosthesis preferences
There is no one-size-fits-all answer — only stage-specific guidance.
No one tells you quite how much changes in those first weeks after surgery. The things that felt automatic — getting dressed, reaching for a bra, stepping out the door — suddenly require thought, planning, and sometimes a fair amount of trial and error. The last thing you need on top of everything else is the frustration of not knowing which bra to buy, which prosthesis size to ask for, or whether the one you have is actually working for you.
That’s exactly why we built this calculator.
The Post-Mastectomy Bra Calculator gives you:
- A stage-specific bra recommendation
- An estimated prosthesis size (Amoena scale cross-referenced by volume)
- Brand suggestions based on your recovery phase
- Practical fit advice tailored to your surgery type
Everything runs privately in your browser. Nothing is stored.
👇 Use the calculator below.
Breast Cancer Recovery • Specialist Fit Tool • 2026
Post-Mastectomy
Bra Calculator 2026
A gentle, private, step-by-step tool to find your ideal bra, prosthesis size, and brands — matched to your surgery type, recovery stage, and body.
Why Standard Bra Sizing Doesn’t Work After Mastectomy
Here’s something most bra guides don’t acknowledge clearly enough: the rules change after surgery.
Standard bra fitting is already imprecise. But post-mastectomy fitting involves layers of complexity that regular sizing simply doesn’t account for — your surgery type, how far along you are in healing, whether you’re using a prosthesis, what kind, and how active your day-to-day life is. A woman six weeks post-unilateral mastectomy has completely different needs than someone three years out who’s back to running and needs a high-impact sports bra with a secure prosthesis pocket.
Worse, most people are discharged from hospital with a post-surgical softie and very little else in the way of guidance. The result? Thousands of people end up wearing the wrong bra for their stage of recovery — sometimes for years.
What the Post-Mastectomy Bra Calculator Actually Does
Rather than giving you a single size recommendation (which would be almost meaningless without context), our calculator builds you a complete, stage-specific plan.
Here’s what it covers:
Step 1 — Surgery type. You tell us whether you had a unilateral mastectomy, bilateral mastectomy, lumpectomy, or mastectomy with reconstruction. This immediately filters your recommendations — bilateral, for instance, requires bras with dual pockets, while lumpectomy often only needs a partial shell to balance volume.
Step 2 — Recovery stage. There are four stages: immediate post-surgical (0–6 weeks), early recovery (6–12 weeks), established recovery (3–12 months), and long-term (1+ years). The bra you need at week three is genuinely different from the bra you need at month ten. The calculator adjusts everything accordingly.
Step 3 — Your measurements and preferences. Your pre-surgery band and cup size, current underbust measurement, activity level, prosthesis preference (full silicone, partial shell, swim form, or none), and closure preference (front or back). None of these are required — the calculator works with whatever information you have — but the more you add, the more specific the results.
Step 4 — Your personalised plan. This is where it all comes together: your estimated Amoena prosthesis size (cross-referenced to volume in cc), recommended bra types for your specific stage and surgery, specialist brand recommendations (with notes on each), practical fitting tips, and links to related tools.
Everything is private. Nothing is stored. It runs entirely in your browser.
Understanding Prosthesis Sizing: Why It’s More Complicated Than You Think
One of the most common questions asked after mastectomy is some version of: “What size prosthesis do I need?”
It sounds like it should have a simple answer. It doesn’t — and here’s why.
Prosthesis sizing doesn’t directly match bra cup sizing. Amoena, the most widely used prosthesis brand globally, uses a scale of sizes 1 through 12 based on approximate volume in cubic centimetres. Trulife, ABC (American Breast Care), and other manufacturers use their own sizing scales. A breast care nurse or certified mastectomy fitter will cross-reference these scales against your body — but it helps enormously to walk into that appointment with a starting point.
Our calculator maps your pre-surgery cup size to an approximate Amoena size range using documented volume equivalents (AA cup ≈ 80–120cc through P cup ≈ 3,000cc+), then shows you the adjacent sizes so you can see where you sit on the scale and what the weight implications are at each level.
One thing the calculator is clear about: this is an estimate, not a prescription. A size 4 prosthesis on one brand may feel quite different from a size 4 on another. Always get your first fitting with a specialist — and remember that in many countries, including the UK (via NHS) and the US (via many insurance plans), mastectomy prostheses are available at no cost to you.
Recovery Stage by Stage: What to Expect from Your Bra
The First Six Weeks (Immediate Post-Surgical)
This stage is about one thing: not adding to your discomfort. You need a post-surgical camisole or soft vest with internal drain pockets, no underwire, no clasps that press on wounds, and fabric gentle enough for skin that may still be very tender. A fibre-fill softie (not silicone — that comes later) sits inside the pocket and provides balance without any weight.
Most breast care nurses will offer a fitting for a post-surgical camisole before you leave hospital. If they don’t bring it up, ask. You are entitled to this support.
Brands to know at this stage: Softee by Anita, Amoena’s post-op range, and Trulife’s immediate care collection. All three are recommended by NHS breast care nurses and are available in a range of fits.
Weeks Six to Twelve (Early Recovery)
Swelling has usually started to subside. You can move to a soft pocketed mastectomy bra — wire-free, with a proper sewn pocket to hold a lightweight shell prosthesis. This is also the stage where your shape may still be changing, so the calculator will tell you not to invest heavily in full silicone prostheses just yet.
The key thing to know about your bra at this stage: the band still does 80% of the work. If you’re compensating by tightening your straps, your band is too loose — and prosthesis weight makes this even more important to get right.
Three to Twelve Months (Established Recovery)
Your shape has largely settled. This is when most people get their first fitting for a full silicone prosthesis and begin exploring a wider range of bra styles — pocketed T-shirt bras, soft-wired options, even lightly structured styles depending on your stage of healing and your surgeon’s guidance.
If you haven’t seen a certified mastectomy fitter yet, now is the time. Amoena, Trulife, and many department stores offer free specialist fittings. It’s worth going even if you think you’re managing — the difference between “good enough” and genuinely well-fitted is significant.
One Year and Beyond (Long-Term)
The full range is open to you. Everyday pocketed mastectomy bras in fashion styles, sports bras with secure prosthesis pockets for high-impact exercise, mastectomy swimwear — plus, for those who’ve had bilateral mastectomy and choose to live flat, beautiful wire-free bralettes and flat-closure styles designed specifically for a flat chest. The range of options available to mastectomy patients has improved dramatically in recent years, and our brand recommendations reflect what’s currently available in 2026.
The Brands Worth Knowing
The calculator surfaces brand recommendations based on your specific combination of surgery type and recovery stage, but here’s an honest overview of the landscape:
Amoena is the global leader for good reason. Their prosthesis range covers sizes 1–12, their bra collection spans every stage from post-surgical to swimwear, and their free fitting service (available in many countries) is staffed by specialist consultants. If you’re only going to know one brand, know Amoena.
Trulife is the UK’s other major specialist and is available on NHS prescription. Their bilateral range is particularly strong, and their post-surgical camisoles are among the most practical available.
Anita Care is where to go once you’re looking for serious sports support. Their mastectomy sports bra collection is technically excellent — the high-impact versions are genuinely secure, which matters enormously when you’re wearing a prosthesis.
Softee by Anita (Anita’s immediate post-op sub-line) is the gold standard for weeks 0–6, widely recommended by NHS nurses for its cotton construction and well-designed drain pockets.
Wacoal Awareness, ABC (American Breast Care), and Nearly Me round out the core US-market options with strong everyday bra ranges and good customer fitter networks.
Knix and brands like it represent a newer wave of mastectomy lingerie — more contemporary aesthetics, more accessible price points, and a design philosophy that doesn’t sacrifice comfort for style. Worth knowing if you want something that doesn’t look or feel “medical.”
Top 36B Bras That Most People Love (Smooth + Support)
One trending value pick for everyday comfort + one premium “best-fit” option for a smooth, lifted shape.
Warner’s Cloud 9 Easy Size Underwire T-Shirt Bra (RA1051A)
- Stretch-to-fit cups = forgiving fit if you’re between B/C
- Lightweight underwire that moves with your body (less “dig”)
- Super-soft fabric for everyday wear under tees
Wacoal Basic Beauty Spacer Underwire T-Shirt Bra (853192)
- Spacer cups = breathable, smooth shape under clothes
- Hidden sling support adds lift without heavy padding
- Everyday “polished” fit when you want clean lines
Frequently Asked Questions About Post-Mastectomy Bras
When can I wear a regular bra after mastectomy?
The timeline varies by surgery type and individual healing, but most surgeons advise at least 6 weeks in soft, wire-free bras post-mastectomy before introducing any structure. After reconstruction, underwire is typically not recommended for 6–12 months. Always follow your surgeon’s specific guidance.
What is a mastectomy bra and how is it different from a regular bra?
A mastectomy bra has a built-in sewn pocket on one or both sides to hold a prosthesis securely. The pocket prevents the prosthesis from shifting during movement. Beyond the pocket, mastectomy bras are often designed with softer inner linings, wider bands for better support, and features like front closures that make dressing easier during recovery.
What size prosthesis do I need after mastectomy?
Your prosthesis size is based on your pre-surgery cup size and the volume of breast tissue removed. Amoena’s scale runs from size 1 (AA cup equivalent, ~80–120cc) to size 12 (specialist large volumes). Our calculator estimates your starting size based on your cup size — but a certified fitter will confirm with a physical fitting. In the UK, your first prosthesis is available free on the NHS.
Can I wear a bra immediately after mastectomy?
Yes — but it must be the right kind. A post-surgical camisole or soft vest (not a structured bra) is appropriate from day one. It should have no underwire, no firm clasps near wounds, and ideally internal pockets for surgical drains. Your breast care nurse can fit you for one before discharge.
Is a mastectomy bra available on the NHS?
In England, Wales, Scotland, and Northern Ireland, you are entitled to mastectomy bras and prostheses on NHS prescription. The number of bras provided per year varies by trust, but you should be offered this. Ask your breast care nurse or GP practice if you haven’t been told about it.
What’s the difference between a prosthesis and a softie?
A softie (also called a fibre-fill form or temporary prosthesis) is a lightweight, washable cotton or microfibre form used in the immediate weeks after surgery. It provides visual balance without any weight on healing tissue. A silicone prosthesis is the longer-term form — heavier, more natural in weight distribution, and designed to match the natural movement and warmth of breast tissue. You’ll typically progress from softie to shell to full silicone as recovery advances.
How long does a silicone prosthesis last?
Most full silicone prostheses last approximately two years before the silicone starts to break down and lose its shape. Check for leaking or change in feel. Many insurance plans (and the NHS) cover regular replacement — ask your care team about the process in your area.
What bra should I wear for exercise after mastectomy?
Once you’re cleared for exercise by your surgeon, a dedicated mastectomy sports bra with a secure pocket is essential. The pocket must hold the prosthesis firmly during impact — a regular pocketed bra won’t do this. Anita Active, Panache Sport (adapted versions), and Amoena’s sports range are the most recommended options for everything from walking to high-impact running.
A Note on This Calculator
We want to be clear about what this tool is and what it isn’t.
It’s a starting point — a way to arrive at your consultation with your breast care nurse or mastectomy fitter with some context, some vocabulary, and a clearer idea of what to ask for. It surfaces estimates based on documented clinical sizing conventions and specialist brand guidelines.
It is not a substitute for a professional fitting. No online tool is, and particularly not for something as individual as post-mastectomy sizing where body changes, scar tissue, and personal comfort preferences all play a role that a screen can’t assess.
What it can do is make the process less overwhelming. And sometimes, that’s the thing you need most.
Related Tools
- Bra Size Calculator — Find your standard bra size from measurements
- Sister Size Calculator — See equivalent sizes that share your cup volume
- International Size Converter — US, UK, EU, AU, and FR sizing cross-reference
- Bra Fit Problem Solver — Diagnose band riding, strap slipping, and cup fit issues
- Sports Bra Calculator — Find your sports bra size and impact level
