Breast implant sizes are measured in cubic centimeters (cc) of volume, not cup sizes, and the right size is the one that fits your frame: an implant no wider than the base of your breast, in a profile that gives the projection you want, at a volume your tissue can cover for the long term. As a rough rule, about 150 to 200 cc adds one cup size, but the same 300 cc implant reads a full cup apart on two women with different chests, which is why nobody should choose a number from a photo.
This guide explains how implants are measured, what cc means in cups, how Dr. Cat Begovic, MD, FACS, board-certified plastic surgeon, sizes her patients in Beverly Hills, what the common sizes look like on different frames, how shape, profile and placement change the result, the long-term cost of going too big and the regret of going too small, and how to try a size at home before you decide. For the operation, photos and booking, see breast augmentation in Beverly Hills.
How Breast Implants Are Measured
Every implant is defined by three numbers: its volume in cc, its base width (diameter) in centimeters, and its projection, how far it stands forward from the chest wall. Volume is the number patients know; width and projection are the numbers that decide how the volume looks. Manufacturers make each volume in several width-and-projection combinations, called profiles, so "350 cc" on its own describes a family of implants, not one. Dr. Cat uses Mentor implants.
Why cup size is unreliable
A cup letter is not a volume. Cup size is relative to band size, so a 32D holds far less than a 38D, and the same breast can measure a 34C in one brand and a 36B in another; a woman who wears a C in three bras owns three different cups. Surgeons stopped planning in cups for that reason: no surgeon can promise a cup letter, only a volume placed in a measured breast. Tell Dr. Cat the look you want and bring a bra you like; she will translate it into cc.
Profile: low, moderate, moderate plus, high, ultra high
Profile is the trade between width and projection at a fixed volume. Dr. Cat's post on breast implant shapes gives the numbers for a 300 cc implant: a moderate profile is about 12.8 cm wide and projects 3.1 cm, a moderate plus is 12 cm wide and projects 3.6 cm, a high profile is 11.1 cm wide and projects 4.5 cm, and an ultra high is narrower and more projected still. A low profile is wider and flatter than a moderate. So the same 300 cc can be a wide, gently sloped breast or a narrow, round, forward one, and the profile is chosen to fit the width of your chest rather than for the look alone.
Base width and the breast footprint
The most important measurement is the base width of your breast, the distance across the breast where it meets the chest wall. Dr. Cat calls the base diameter the most important measurement in choosing an implant, because an implant wider than the footprint sits into the armpit or toward the middle, can produce a joined "uniboob", and thins the tissue at its edges over the years. She fits the implant width to your breast first, then reaches the volume you want by choosing the profile within that width. Projection is the third number: at a fixed width, a higher profile adds volume forward, which is how a narrow chest gets a full result without an implant that is too wide.
How Many CC Is a Cup Size?
About 150 to 200 cc per cup size, as a rough rule, and it is only that. Use the lower figure on a small band (30 to 32) and the higher on a larger one (36 and up), because a cup on a wider chest holds more volume; on a petite frame 200 cc can be a cup and a half. Dr. Cat's post on C cup vs D cup works the same rule from the other direction: the difference between the two is one step of roughly 150 to 200 cc, and where you land depends on where you start. A rough estimate for a starting point: decide how many cups you want to add, multiply by 150 to 200 cc, then adjust for your frame, and accept that the exam will move the number. Two women given an identical 300 cc implant can end a full cup apart because of chest width, the tissue they started with and the profile chosen.
How Dr. Cat Sizes Her Patients
Sizing at the consultation starts with measurements, not preferences. Dr. Cat measures the chest wall and the base width of each breast, assesses how much tissue you have and how elastic the skin is, and notes your height, weight and proportions, which together set the range of implant widths and volumes your anatomy can carry. Then the range becomes a choice: you try sizers, sample implants slipped into a bra, and see the candidate volumes on your own frame in a fitted top, side by side with before-and-after photos of patients with a similar build. Patients describe it as playing dress-up until one size feels right, and some come back more than once before deciding. Her own view is that implants do not need to be big to add shape and femininity, and that the final decision is yours once she has shown you what is safe.
Sizing continues in the operating room. Where the two breasts differ, Dr. Cat tests different sizes before the final implant placement so the pair ends balanced, which is how she addresses asymmetry, and she inserts the implant with a no-touch technique to minimize contamination. She has breast implants herself and has written about a less-than-ideal first implant surgery and complications after her revision, which is part of why her sizing errs toward what the tissue can hold for decades rather than the largest implant it can take today. Her post on ideal breast size by height and weight explains how she narrows the range from your build.
The Range of Sizes and Why
Dr. Cat places implants tailored to each patient's anatomy and aesthetic preferences; they range from small "ballet breasts" at 175 cc to as full as 700 cc. Implants are made from about 100 cc to 800 cc; below 200 cc the change is subtle, the choice of athletes and women who want shape more than size, and above 500 cc the implant is wider or more projected than most frames carry without long-term cost. The arithmetic explains where a request usually lands: a woman who starts at an A or a small B cup and wants a full C or a D is asking for one and a half to two cups, and at 150 to 200 cc per cup that is a few hundred cc, before her frame adjusts it. Popular is not the same as right for you, and the frame table below shows why the same cc reads differently by build.
What 300 cc, 400 cc and 500 cc look like
On an average frame starting at a small B, 300 cc usually gives a full C, 400 cc a D, and 500 cc a DD or more; on a petite frame each of those reads about a cup larger, and on a tall or broad frame about a cup smaller. Dr. Cat's C cup vs D cup post shows three of her patients with cc labels: 300 cc high-profile silicone implants that read as roughly a C, 350 cc that fall between a C and a D, and 400 cc that read as a fuller D on that patient. The profile changes the picture as much as the volume: 400 cc in a moderate profile is wide and soft, 400 cc in a high profile is narrow and round.
| Your frame and starting point | Typical cc range | Roughly equals |
|---|---|---|
| Petite or narrow chest | About 200 to 350 cc | Subtle to one cup up; the same cc reads larger |
| Average frame | About 300 to 450 cc | One to one and a half cups up |
| Broader chest or taller | About 400 to 600 cc | Fuller, still proportionate; the same cc reads smaller |
| The most natural look on any frame | Matched to your base width | Proportion over volume |
The ranges are illustrative and general, not a recommendation; the right cc for you is set by your base width, tissue and goals in person.
Your Frame and the Look You Want
Petite frames carry less volume per cup and less skin to cover an implant, so a moderate volume in a moderate plus or high profile, which keeps the width narrow, usually reads as a fuller result than the cc suggests; the risk on a small frame is width, not volume. Athletic patients tend to have a wide chest, firm tissue and little breast to start, and often want shape without interference with running or training, so they choose smaller volumes in a moderate profile that sit within the pectoral outline. Tall and broad frames need more volume to show the same change, and a 400 cc implant that would look oversized on a 32 band looks proportionate on a 38. The look is a separate decision from the size: a natural result keeps the upper breast sloped and the width inside the footprint, while a full look adds upper-pole roundness with a higher profile, and both can be done at the same cc. Bring photos of results you like and dislike, and think about your clothes and your sport: a woman who runs, goes braless or wears tailored tops usually regrets a large implant, and a woman who wants her tops filled out regrets a small one.
Implant Shapes: Round vs Anatomical, Smooth vs Textured
Round implants are symmetrical, so they give fullness across the breast and at the top, cannot rotate, and are the shape most patients and most surgeons choose. Anatomical (teardrop) implants carry more volume at the bottom and taper at the top to mimic the natural slope; they exist only in cohesive silicone gel, because saline cannot hold the shape, and they need a textured shell to grip the tissue so they do not rotate, since a rotated teardrop is a visible deformity. Texture is the other choice: smooth implants move freely in the pocket and feel more natural in motion, while textured shells hold position and have been associated with the rare lymphoma BIA-ALCL, which is one reason smooth round implants dominate today. Whether the implant is saline or silicone changes feel and rippling more than size, and our comparison of saline vs silicone implants covers that decision.
Breast Implant Profiles, Explained
Low and moderate profiles are wide and flat, with a gentle slope, and suit broad chests and patients who want a natural look. Moderate plus is the middle ground, a little narrower and more projected, and a common choice for an average frame. High profile is narrow and round with strong projection, which fits a narrow chest that wants noticeable volume without an implant that spills to the sides. Ultra high has the most projection on the narrowest base and is chosen by petite patients with little tissue who want a dramatic change, at the cost of a rounder, more visible upper breast. Dr. Cat's shapes post shows the effect on three of her patients with nearly the same base width: 300 cc moderate plus, 350 cc high and 480 cc ultra high, each more projected than the last. The profile is chosen after the width, never before it.
Placement and How It Changes the Look
The same implant looks different over and under the pectoral muscle. Under the muscle, the placement Dr. Cat uses for most patients with thin tissue (a pinch of upper-breast tissue under two centimeters points to it), the muscle drapes over the top of the implant, softens its edge, hides rippling and gives a natural slope; it also makes the implant read slightly smaller, so surgeons often size a little up to compensate. Over the muscle, for patients with enough breast tissue to cover the implant, the result is rounder at the top and more visible in a thin patient, with an easier first week. Placement changes the recovery as much as the look, which our guide to breast augmentation recovery explains, and our post on breast implant placement over or under the muscle weighs the two in detail. Two related decisions come up in the same conversation: if the breasts have dropped, a larger implant will not lift them, and our comparison of a breast lift vs augmentation answers whether you also need a lift; if you want a modest change with no device, implants vs fat transfer sets out what fat can and cannot do.
Too Big: The Long-Term Cost of Oversizing
An implant that is too large for the tissue is the most common source of problems that arrive years later, and the reason Dr. Cat steers patients toward proportion. The weight of a large implant stretches the skin and thins the breast tissue over it, so the edges and ripples of the implant become visible, especially at the sides and the cleavage; the stretched skin then sags, taking the nipple downward and leaving the implant sitting high above the breast, a look that only a lift and a smaller implant correct. Stretch marks, a widened cleavage gap, back, neck and shoulder strain, and interference with sport follow the same size. The correction is breast revision, which costs more than the first operation and is harder, because tissue that has been thinned cannot be thickened. Dr. Cat's rule is the largest size that still looks natural and is safe for the anatomy in front of her: proportion over maximum volume, because going a size up later is easier than undoing tissue damage from going too big now. Problems specific to implants, from rippling to capsular contracture, are covered on our page on breast implant problems.
Too Small: The Regret and the Second Surgery
The opposite mistake is quieter but common: the patient who chose the smallest option out of fear of looking "done", waited a year, and came back wishing she had gone one size up. A size exchange is a second operation with its own cost and recovery, and it is avoidable. Three things cause it. The first is judging the size in the first two weeks, when swelling and a high, tight implant make the breasts look larger than they will be; by six months, after the implants drop and the swelling leaves, the result reads smaller, and a size that looked right in week two can look modest at month six. The second is sizing in a padded bra or a loose top, which flatters everything. The third is letting a partner's or a friend's caution set the number. The remedy is the sizer session in the clothes you wear, the rice test at home, and Dr. Cat's answer to the question every patient asks, which is that within the safe range for your frame she will tell you which size will still look like you in ten years, and which will look like it did at week two.
The Rice Test at Home
The rice test is the low-tech sizer. Rice is measured by volume like an implant, so a US measuring cup of dry rice is about 240 cc; pour the volume you are considering into the foot of a nylon stocking, tie it off, and shape it into a flat disc. Put one in each cup of an unpadded, non-underwired bra a cup size larger than you wear, and live in it for a day: sit at your desk, walk, drive, try your tops and a swimsuit, and look from the side and in photos, not only in the mirror. Then try the next size up and the next size down. Rice sits a little wider and flatter than an implant of the same volume and does not show profile, so it answers "how much" and not "what shape"; treat the result as a range to bring to the consultation, where the sizers and the exam settle it.
Before and After Photos by Implant Size
Photos labelled by cc are the only way to see what a number means on a body like yours. Dr. Cat's before and after photos by implant size are consented and unedited, shown from the front and the side, and at the consultation she pulls the cases with a frame like yours; our patient stories include sizing decisions told by the patients themselves, including one who visited several times before she chose.
The Sizing Consultation
The consultation with Dr. Cat is $500, credited toward your surgery, and can be virtual for patients who travel to Beverly Hills; the sizers are tried in person before surgery. Bring photos of results you like and dislike, a bra and a top you want to look good in, and answers to the questions she will ask: your plans for pregnancy and breastfeeding, your sport, your work, and how visible you want the change to be. She measures, examines the tissue, narrows the range by your frame, and shows you the candidate sizes; you leave with a size, a profile, a placement and an incision plan rather than a cup letter. Dr. Cat's surgeon's fee for a breast augmentation with implants is $17,500 to $22,500; the implants, the operating room and anesthesia are quoted at your consultation, and our guide to breast augmentation cost explains what the quote includes. Surgeon's fees are typical ranges: a more complex case can cost more, and your fee is set at your consultation and is final only in your written quote. If your breasts are noticeably different in size or shape, sizing becomes two decisions, one per side, and our page on uneven breasts explains how Dr. Cat plans for it. After surgery the implants settle over three to six months, and our post on drop and fluff explains what changes and what does not.
Frequently Asked Questions About Breast Implant Sizes
What is the most popular breast implant size?
There is no single popular size in Dr. Cat's practice. She places implants tailored to each patient's anatomy and aesthetic preferences; they range from small "ballet breasts" at 175 cc to as full as 700 cc. Popular is not the same as right: a 350 cc implant reads a cup larger on a petite frame and a cup smaller on a broad one, and the size that suits you comes from your base width, tissue and goals.
How many cc is a D cup?
There is no cc that equals a D cup, because a 32D and a 38D hold different volumes. With the rough rule of 150 to 200 cc per cup, a patient starting at a B cup on a 34 band usually reaches a D with somewhere around 350 to 400 cc; on a broad frame the same implant leaves her at a full C, and on a petite frame it can pass a D.
How many cc is a cup size?
About 150 to 200 cc per cup size as a rough rule, using the lower figure on a small band and the higher on a large one. It is a loose guide, not a formula: profile, placement and the tissue you start with change how the same volume reads, and on a small frame 200 cc can be a cup and a half.
What size implant is most natural?
The one whose base width matches your breast footprint, in a moderate or moderate plus profile, at a volume your skin and tissue can cover. Natural is a matter of proportion rather than a cc: an implant no wider than the breast, with a slope rather than a shelf at the top, and enough of your own tissue over it to hide the edge.
Can I just pick the cc I want?
Your goal sets the direction and your anatomy sets the safe range. Dr. Cat measures the base width of the breast and the tissue over it, which fixes how wide an implant can be, then shows you volumes within that width with sizers so you choose the look. A cc from someone else's photos can be wrong for your frame by a full cup.
Is it bad to go too big?
Yes, and the cost arrives years later: thinned tissue, visible rippling, stretch marks, faster sagging, back and shoulder strain, and a revision that is more expensive than the first operation. An implant wider than your breast footprint or heavier than your skin can carry is one of the commonest reasons for revision surgery; going a size up later is easier than repairing tissue.
What is the cut-off age for breast implants?
There is a minimum but no maximum. The FDA approves saline implants for breast augmentation from age 18 and silicone from 22. At the other end, health matters more than age; older patients are sized the same way, and those with lax skin often do better with a lift alongside the implant than with a larger implant alone.
Does 5 to 10 lbs of weight gain affect the size of breast implants?
The implant does not change; the breast tissue around it does. Five to ten pounds rarely changes the look measurably, since only a fraction of any gain goes to the breasts. Larger swings do: a significant gain enlarges the natural tissue over the implant and a significant loss deflates it, which can leave the implant more visible or the breast looser.
Will my implants look smaller after they settle?
A little, yes. Swelling makes the breasts look larger for the first weeks, and as it resolves and the implants drop into position over three to six months the upper fullness softens and the size looks more natural. The volume has not changed; judge your size at six months, in the bra you plan to wear, not in the second week.
See Your Size in Person
The only way to choose an implant size with confidence is to see the candidates on your own frame, with a surgeon who has measured it. Start with a free discovery call: share a few details, our patient concierge will call you for a short conversation, and if surgery makes sense you book a sizing consultation with Dr. Cat ($500, credited toward your surgery), in person or virtually. You can also call (310) 858-8808. Before you do, see her before and after photos by implant size and read about breast augmentation in Beverly Hills.
Medically reviewed by Dr. Cat Begovic, MD, FACS, board-certified plastic surgeon. Last reviewed September 2026.