Established 2005
Guided by your goals. Informed by our experience. Achieved together.
How to Choose Breast Implant Size
A guide to breast implant sizing at Aesthetica Image Centre — including Dr Tony Prochazka's 45:55 proportion guideline, implant profile, and the factors that shape your final result.
Choosing Your Breast Implant Size
This page is a general guide. Your ideal size and profile are determined together with Dr Tony during your personal consultation.
Choosing the right breast implant size is one of the most important decisions in breast augmentation. The ideal size depends on your body proportions, lifestyle, and aesthetic goals.
At Aesthetica Image Centre in Armadale, Melbourne, we guide you through this process with personalised assessment and careful planning to help you achieve a balanced, natural-looking result.
Size is one part of a bigger picture — profile, placement and your own anatomy all shape the final outcome.
If you're exploring your options, you may also wish to read our guide to Breast Implants in Melbourne.
The 45:55 Breast Proportion Guideline
The 45:55 breast ratio is an aesthetic guideline often referenced in breast surgery when considering implant size. It suggests that a natural-looking breast may have approximately 45% of its volume above the nipple (upper pole) and 55% below (lower pole).
Upper Pole (45%)
A gentle slope above the nipple, avoiding an overly full or "augmented" look in the upper breast.
Lower Pole (55%)
Slightly fuller to create a natural contour, echoing the way volume naturally sits in an unaugmented breast.
This concept, based on the work of Dr Tony Prochazka, is used as a visual guide rather than a fixed rule when considering your breast implant size — helping to achieve a balanced and proportionate result rather than a purely numerical one.
Breast Implant Size Is More Than Volume
Breast implant size is often measured in cubic centimetres (cc), but choosing the right size isn't simply about selecting a number. Factors that influence implant size include:
- Your natural breast tissue and chest width
- Your height and overall body proportions
- Skin elasticity and breast shape
- Your lifestyle and activity level
- Your personal aesthetic preferences
Dr Tony Prochazka will consider all of these factors when helping you choose a size that complements your body. The final result is also influenced by how implants are positioned — you can learn more in our guide to implant placement options.
Implant Profile and Shape
In addition to volume, the implant profile affects how your breasts will look. Two implants of the same size (cc) can create quite different results depending on profile.
Low Profile
Wider at the base, with a more subtle projection forward — often chosen for a fuller-figured, natural look.
Moderate Profile
A balance of projection and width, suiting a broad range of body types and goals.
High Profile
More forward projection with a narrower base — often chosen by patients with a smaller chest width seeking more visible fullness.
Profile selection works together with size to achieve your desired outcome — one without the other tells only part of the story.
How Sizing Is Approached at Consultation
Choosing a size is a collaborative process, not a single decision made in isolation. At your consultation, Dr Tony will:
- Assess your natural breast tissue, chest width and body proportions
- Discuss your goals, lifestyle and any concerns about scale or projection
- Explain how the 45:55 guideline applies to your individual anatomy
- Talk through implant profile options alongside size
- Answer your questions honestly, including where a particular size may not be advisable for your frame
Bringing reference images of the general look you're hoping to achieve can be a helpful starting point for this conversation.
Setting Realistic Expectations
Every patient's anatomy is different, and results vary between individuals. During consultation, Dr Tony will discuss what may be achievable for your specific anatomy and guide you towards a suitable option — including being honest if a particular size or profile isn't likely to give you the result you're hoping for.
Ask Julie
Not sure where to start with sizing? I'm Julie Bates, Aesthetica's Patient Care Coordinator. Our online chat is answered by our friendly staff — no AI, no call centre — so you're always talking to a real person, at your own pace.
Frequently Asked Questions
It suggests a natural-looking breast has around 45% of its volume above the nipple and 55% below. It's used as a visual guide during consultation, based on Dr Tony Prochazka's approach, rather than a fixed rule applied to every patient.
Not necessarily — implant profile and your own chest width and tissue play a major role too. Two implants with the same cc volume can look quite different on the same person depending on profile, which is why size and profile are always discussed together.
Your consultation is the place to discuss this in detail with Dr Tony, including practical ways to visualise different sizing options for your frame. He'll talk you through what's available and most useful for your specific decision.
Yes, size and placement are considered together, not separately. Larger implants or those with limited natural tissue coverage may influence which placement and incision approach is most suitable — this is covered in our guide to implant placement options.
Yes — breast implants, particularly saline and rounder profiles, can shift and look different depending on position. This is normal and something Dr Tony can explain in the context of your chosen implant type during consultation.
Reference images of the general look you're hoping to achieve are often more useful than a specific cc number alone. Dr Tony can then translate that goal into a size and profile appropriate for your individual anatomy.
Your Breast Implant Doctor
Dr Tony Prochazka
MBBS (Melb), FACCSM (Med), FCPCA · AHPRA MED0001181976Over 20 years' experience in cosmetic medicine and surgery-related procedures, with a focus on breast augmentation, liposculpture, fat transfer, thread lifting, blepharoplasty, facelift and facial rejuvenation. Former Inaugural Dean of the Faculty of Medicine at the Australasian College of Cosmetic Surgery, and former Vice-President of the Cosmetic Physicians Society of Australasia.
Why Aesthetica Image Centre
For over 20 years, Aesthetica Image Centre has been trusted for our:
- Thoughtful, unrushed consultations focused on your individual anatomy
- An honest approach to sizing — including when a smaller or larger option may suit you better
- Warm, caring and empathetic approach
- Convenient Armadale location
- Personalised aftercare and ongoing support
Book Your Consultation
If you'd like to discuss breast implant sizing with Dr Tony, this is best done by calling, texting or emailing. If you're early in your research, we invite you to book a complimentary consultation with our patient care team — without pressure or obligation.
Book Your Appointment OnlineFull contact details, opening hours and our enquiry form are below.
Get in touch
Consultations are available in person or by phone, and range from complimentary to $250.
Our Address
Aesthetica Image Centre
4 Northcote Road
Armadale VIC 3143
Call or text
(03) 9824 6134 or 0409 149 521
Online Chat
Ask Julie, reply to your online chat, no AI or call centre.
We look forward to your enquiry.
Since 2005, Aethetica Image Centre has provided facial rejuvenation, aesthetic surgery and skin treatments to patients throughout Melbourne and Victoria.