Find Your Fit. Feel the Difference.
At Rose & Thorne, we believe every woman deserves lingerie that fits beautifully and looks even better. With sizes from 10–24, C–K, our bras are expertly designed for all day comfort, all night glamour, on-the-move moments, and motherhood too. The fit tools below are a great place to start—but nothing compares to a personalised online fitting, which can be booked via our website.
If you're new to Rose & Thorne, welcome! The best place to begin is your current size in your old brand. We offer 30-day returns and free online fitting follow-ups to help you find that just-right fit. Don’t just take our word for it—over 10,000 5-star reviews from happy customers say it all!
Still need some help? Book a Virtual Bra Fitting
Let the Band Do the Work
Your band should sit firmly and evenly around your body — it’s the main source of support, not the straps!
Cups Should Hug, Not Spill
No overflow, no gaping — your breasts should be fully enclosed in the cups for a smooth, secure fit.
Comfort Over Labels
If it doesn’t feel right, it’s not the right fit — trust your body, not the tag!
Bra Size Calculator
| 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | |
|---|---|---|---|---|---|---|---|---|
| Body Size - Underbust cm | 68-72 | 73-77 | 78-82 | 83-87 | 88-92 | 93-97 | 98-102 | 103-107 |
| Cup Size - Overbust cm | ||||||||
| C | 86-88 | 91-93 | 96-98 | 101-103 | 106-108 | 111-113 | 116-118 | 121-123 |
| D | 88-90 | 93-95 | 98-100 | 103-105 | 108-110 | 113-115 | 118-120 | 123-125 |
| DD | 90-92 | 95-97 | 100-102 | 105-107 | 110-112 | 115-117 | 120-122 | 125-127 |
| E | 92-94 | 97-99 | 102-104 | 107-109 | 112-114 | 117-119 | 122-124 | 127-129 |
| F | 94-96 | 99-101 | 104-106 | 109-111 | 114-116 | 119-121 | 124-126 | 129-131 |
| G | 96-98 | 101-103 | 106-108 | 111-113 | 116-118 | 121-123 | 126-128 | 131-133 |
| H | 98-100 | 103-105 | 108-110 | 113-115 | 118-120 | 123-125 | 128-130 | 133-135 |
| J | 100-102 | 105-107 | 110-112 | 115-117 | 120-122 | 125-127 | 130-132 | 135-137 |
How to measure yourself
Measuring your Underbust
To get the best results for your "under bust" measurement, you'll need to stand up straight and place a tape around your body in a straight line just below the breasts. It should be horizontal and firm around your body but not uncomfortable. Make sure the tape is not riding up or dropping down as this can put you out by more than one body size.
Measuring your Overbust
The tape should once again be straight around your body but this time the measurement is taken at the "high point" of the breast - the nipple line. It is often best taking this measurement with a bra on and using this measurement as a staring point only. Use your best judgement - if you are currently spilling out of your cups then you need to go up a cup size or two.
Remember your Crossover Size!
The letter in your bra size indicates the volume of your cup, but the tricky thing about bras is it's also dependant on the band size. For example, not all E cups are the same, and the E cup size gets bigger with each band size. Not all cups with the same letter are the same volume. Crossover sizing demonstrates how we can change band size but keep the cup size the same volume, and helps you to understand how your sizing needs change with your body over time. Lost a little weight? Go you! Simply drop a back size and go up a cup size, and vice versa.
International Bra Size Chart
Our handy bra size chart helps you convert international sizes to NZ/AUS. Simply click your
size under the NZ/AUS column to shop our styles in your size! If you
are still unsure what bra style and size is right for you we also offer a range of other fit tools.
Band Size Conversion Chart
