In short
- 🔑 Cup size is not a unit of measurement. The same breast carries different letters depending on the brand; grams do not.
- What is planned is the grams that are removed, and that is estimated from measurements of your own torso.
- The measurement that best predicts how much will have to be removed is the distance from the notch of the breastbone to the nipple.
- ⚠️ Not even the best model gets it exactly right. The most accurate one published was out by an average of 186 grams per case.
- ⚠️ Removing more is not better. Above 1,700 g in total, complications increase significantly.
- And there is one measurement that warns about the nipple: above 36.5 cm from breastbone to nipple, more complications of the nipple-areola complex are seen.
- The real aim is not a letter: it is to remove the weight that causes the symptoms and leave a breast that is proportionate and properly positioned.
It is the question everyone asks at the first consultation, and the honest answer begins uncomfortably: nobody can promise you a cup size, and anyone who gives you a specific letter before surgery is telling you what you want to hear.
But that does not mean it cannot be planned. It is planned — and rather well — just in a different unit. This page explains which one, what can really be estimated and why removing more is not automatically better.
The operation itself is in the breast reduction guide and the concept in what a breast reduction is.
Why cup size is no use for planning
Try something: look at the labels of your last three bras. It is very likely they do not match.
Bra size combines a band and a cup, the cup depends on the difference between two measurements, and each brand calculates it its own way. It is not a physical quantity: it is a commercial label. That is why “I want to end up a 34B” means different things in two shops on the same street.
Grams, on the other hand, are grams. That is why the surgery is planned in grams and in proportions, not in letters, and why a serious consultation will talk to you about how much tissue should be removed and where the nipple will end up, not about a cup size.
What can honestly be said is a guide: if a substantial amount of tissue is removed, you will go down several cup sizes. The exact conversion does not exist.
What can be estimated, and with what margin
Here there are concrete figures, and they are more interesting than they look.
One study analysed 237 patients (474 breasts) who had a reduction, and trained four machine-learning models to predict how many grams would be removed from body measurements: body surface area, body mass index, the distance from the notch of the breastbone to the nipple and the distance from the nipple to the inframammary fold.
Two results matter:
1. The measurement that counts most is the distance from breastbone to nipple. Of all the variables, it had the greatest predictive importance. In other words: what best anticipates how much will have to be removed is how far the nipple has descended, more than weight or body mass index.
2. Not even the best model gets it exactly right. The most accurate one was out, on average, by 186 grams per case. All four models were more accurate than the classic grams-per-body-surface scale, but none gives an exact figure.
Those 186 grams are the most honest answer to “how much will you take off?”: it can be estimated, with a margin that is not negligible. Any figure you are given before surgery is a forecast, not a commitment.
The two measurements that count
If someone measures you with a tape at your consultation, these two are the ones that will shape the plan:
From the notch of the breastbone to the nipple. It anticipates how much tissue will have to be removed, and it also warns about risk to the nipple: in a series of 1,021 patients, a distance greater than 36.5 cm was associated with more complications of the nipple-areola complex.
From the nipple to the inframammary fold. It determines the design and how far the nipple can be raised while keeping its blood supply.
Almost everything else follows from those two measurements: the scar pattern, the type of pedicle and how much can safely be reduced. The techniques are on the page about techniques and pedicles.
Removing more is not better
It is the part least often told and the one most worth understanding before asking for “as much as possible”.
In that series of 1,021 patients (2,142 breasts), resection weight turned out to be the only significant independent risk factor for complications. And the analysis identified a specific point: above 1,700 grams of total resection, the risk of complications increased significantly.
In other words: the amount removed is not a free variable. The more you take, the more the remaining tissue is put under tension, the more the blood supply to the nipple is compromised and the higher the risk of the wound not healing well.
That is why the plan does not aim for the smallest possible breast, but for the point at which the symptoms resolve and the breast is proportionate, with the risk under control. The specific complications are on the complications page.
And one more thing: the aim was never a cup size
It is worth remembering because it reframes the whole question.
In a 2025 meta-analysis with 4,677 patients, 90% had a significant improvement in back pain after a reduction. That is the result the surgery seeks and achieves: taking weight off.
Cup size is a consequence, not the aim. And it is also the part of the result that can least be committed to in writing.
So what is discussed in the consultation?
Cup size. Yes, and that deserves saying plainly after everything above, because otherwise this page looks like an excuse for not answering:
🔑 In clinic we talk about the cup size you would like to have, and that decision is yours. The question is not dodged: it is put on the table.
What changes is what that conversation means. It is not a commitment, it is a guide — and it is the most important one the surgeon gets: it tells them how much volume to preserve in order to get close to what you want. Without that, they are operating blind on the one thing they cannot deduce from an examination.
⚠️ And that is why it cannot be guaranteed 100%. Everything above is still true: cup size is not a unit of volume, two bras with the same label do not measure the same, and what ultimately governs is how much tissue has to be removed to resolve the symptoms safely.
The honest way to put it is this: you say where you want to get to, the surgeon tells you whether that is achievable in your case, and operates aiming there. What nobody serious will do is sign up to a letter.
Book an appointment
You can book your own appointment. Pick the day and time from the free slots in the diary, in a panel that opens right here, without leaving this page.
Frequently asked questions
Can you leave me at a specific cup size?
A cup size cannot be committed to. Cup size is not a physical measurement — every brand calculates it differently — and what is planned is grams and proportions. We can give you a guide as to how many cup sizes you will go down.
How many grams will be removed?
It is estimated from your measurements, above all the distance from breastbone to nipple. As a guide to how reliable that estimate is: the best predictive model published was out by an average of 186 grams.
Can I ask for as much as possible to be removed?
It is not a good idea. In a series of 1,021 patients, resection weight was the only independent risk factor for complications, and above 1,700 grams the risk rose significantly.
What determines whether the nipple does well?
Its blood supply, which depends on the pedicle chosen and on how far it has to be raised. A breastbone-to-nipple distance greater than 36.5 cm was associated with more complications of the nipple-areola complex.
Is it the same as choosing an implant size?
No, and the two should not be mixed up. In an augmentation a known volume is added; in a reduction living tissue with its blood supply is removed, and what is left is not a figure chosen from a catalogue.
And if afterwards I think it has ended up too big or too small?
It is a conversation to have beforehand, putting the symptoms and the proportions first rather than a letter. There is a page of its own on satisfaction and regret: opinions and regret.
Does the result hold up over the years?
It changes with weight, with pregnancies and with the passing of time. It is covered in the reduced breast over the years.
Does losing weight first change the figure?
It can change it, and it is a decision with nuances. It is covered in losing weight before or after.
Sources
- Seu MY, Rezania N, Murray CE, et al. Predicting Reduction Mammaplasty Total Resection Weight With Machine Learning. Ann Plast Surg. 2024;93:246-252. Analysis of 237 patients (474 breasts) who had a reduction; anthropometric variables: body surface area, body mass index, sternal notch-to-nipple distance and nipple-to-inframammary fold distance; sternal notch-to-nipple distance proved the variable of greatest predictive importance; all four machine-learning models predicted resection weight with a lower mean absolute error than the Schnur scale, and the best of them achieved a mean absolute error of 186.20 g. https://pubmed.ncbi.nlm.nih.gov/38833662/
- Mahrhofer M, Wallner C, Reichert R, et al. Identifying complication risk factors in reduction mammaplasty: a single-center analysis of 1021 patients applying machine learning methods. Updates Surg. 2024;76:2943-2952. Retrospective review of 1,021 patients (2,142 breasts) operated on between 2016 and 2020; resection weight was the only significant independent risk factor (OR 1.001; p = 0.007); the model identified that a total resection weight above 1,700 g significantly increased the risk of overall complications, and that a sternal notch-to-nipple distance greater than 36.5 cm correlated with complications of the nipple-areola complex. https://pubmed.ncbi.nlm.nih.gov/39243317/
- Böhmer EM, Betsch M, Stumpfe M, Horch RE, Migliorini F, Pasurka M. The Impact of Reduction Mammaplasty on Back Pain and Posture in Patients with Macromastia: A Systematic Review and Meta-Analysis. Plast Reconstr Surg. 2025. Meta-analysis with 47 studies included and 25 contributing data (n = 4,677); the dichotomous analysis of 12 studies (n = 1,380) found that 90% of patients experienced significant relief of back pain (95% CI 86-93%). Level of evidence II. https://pubmed.ncbi.nlm.nih.gov/41428958/
- Jolkovsky E, Miller MN, McClain W, et al. The Anatomical Breast Burden Model: A Schnur Scale Alternative for Identifying Need for Therapeutic Reduction Mammaplasty. Aesthet Surg J Open Forum. 2026;8:ojaf168. A model based on breast measurements, physical findings and symptoms showed stronger correlations with the anatomical measurements and with resection weight than the grams-per-body-surface scale. Level of evidence 3. https://pubmed.ncbi.nlm.nih.gov/41623429/
Book your consultation
If you arrive with a cup size in mind, bring it: it is useful information about what you are looking for. But the conversation that really determines the result is a different one — what your measurements are, how much should be removed and where the nipple will end up — and that one is had with an examination in front of you.
Clinical confirmation by the surgeon
Registration no. 46/4624077
Registration no. 46/4624503
Last reviewed: 24 September 2026. This content is for information only and does not replace an individual assessment by a healthcare professional.
