How Do I Measure My Bra Size?
Girls, we’ve all been there - painful straps, loose-fitting cups and bands that feel too tight. It’s terrible for your mood, but also not great for the health of your boobs.
It's not uncommon to hear about how uncomfortable bras can be - but but the right bra should feel like you're not wearing anything at all. One of the most common causes of discomfort is an ill-fitting bra, so take it from us when we say that knowing how to measure your bra size correctly is a necessity.
Remember, every body is different - but finding the right bra & fit is easy with just a few simple steps. We recommend measuring your bra size every 6 months, to make sure your bra is still the perfect size and supporting your boobs correctly. Our bodies change constantly, so it's not unusual for your previously comfortable bra to not feel quite the same anymore.
With all the instructions you see online, it can be a little overwhelming having to navigate measuring for a bra at home but trust us when we say it’s as easy as A, B, C.
Here’s how to measure your bra size in 3 easy steps:
Step 1: Measure your band size
Step 2: Measure your bust size
Where possible, we’d suggest measuring yourself without a bra on to get a more accurate measurement.
Trust us, it's a breeze and you'll be enjoying a perfectly-fitting bra in no time!
What you need:
All you'll need is a measuring tape - but don't worry if you don't have one.
You can also use any long string and measure with it as you would a measuring tape, then line your string up against a ruler and take the length for accurate measurements.
It really is that simple.
It’s worth remembering that these measurements are in inches, but if you only have a centimetre ruler on hand, keep in mind that 2.54cm is an inch… or Google the conversion (that’s what we do, too).
How To Calculate Your Bra Size At Home
Step 1:
How To Measure Your Band Size
Wrap the measuring tape (or string) from around your back to underneath your bust where your bra band would usually sit. It should fit snugly around you - not too loose and not too tight - with enough room for 2 fingers to fit underneath the tape.
If the number you note down is an odd number, round up by one inch (we recommend rounding up for a more comfortable fit, but it depends on your body type and your personal preference).
Step 2:
How To Measure Your Bust Size
Now, measure the fullest part of your bust - from the back all the way around to the nipples.
You don’t want to pull the tape around so tightly that it squeezes you, but you want to make sure it’s nice and flat, for a more accurate measurement. Once you’ve got the number, make a note of it for later - you’ll need it when we come back to calculate your cup size.
Step 3:
How To Measure Your Bra Cup Size
Don't worry, you can put your protractor away. From bust size to cup size, there isn't any complicated maths involved here.
Remember: Cup Size = Bust Size - Band Size
Then, use the table below to find the number you've just calculated. The letter that corresponds to that number will be your cup size.
We did say it was easy…
For example, if your bust measurement is 34 inches and your band size is 30 inches, the difference is 4 inches, meaning your cup size will be D.
Refer to the bra size chart below to check your cup size.
| Bust Size - Band Size: | Cup Size: |
|---|---|
| Less than 1 | AA |
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD |
| 6 | E |
| 7 | F |
| 8 | FF |
| 9 | G |
| 10 | GG |
How should a bra fit correctly?
- A bra band should feel snug around you: not too tight, not too loose and definitely not riding up.
- Bra straps are there for support. They shouldn’t dig into you, nor should they constantly be sliding down.
- Bra cups are there for coverage. They’re too big if there are gaps but too small if they squeeze your boobs or cause double-boob.
If your bra doesn't feel comfortable, it's time for a new one.
Everyone is different - and so are different brands’ sizes. Your bra size might be different depending on where you shop. This guide will help you find your size in Lounge bras, but you might find we recommend a different size to the one you're used to wearing. That's totally normal!
If your measurements are correct but the band or cup isn't fitting quite right, it might be time to try your sister size.
What Is Sister Sizing?
With sister sizing, both the band and cup sizes are adjusted to fit your shape, because not everyone with the same cup size has the same band size (and vice versa).
For example, you might find that a 32D from one shop fits perfectly, but the same size from another shop fits a little tightly around the band. That’s when we’d recommend a sister size (in this case, a 34C) to make sure you always get the most comfortable fit.
Our bra sister sizes are here to help find the most comfortable bra fit for you.
Depending on whether it’s a differently-sized band or cup size that you’re looking for, you can refer to our sister sizing bra chart below for more size options suitable for you.
| 28 Band: | 30 Band: | 32 Band: | 34 Band: | 36 Band: | 38 Band: | 40 Band: |
|---|---|---|---|---|---|---|
| 28A | ||||||
| 28B | 30A | |||||
| 28C | 30B | 32A | ||||
| 28D | 30C | 32B | 34A | |||
| 28DD | 30D | 32C | 34B | 36A | ||
| 28E | 30DD | 32D | 34C | 36B | 38A | |
| 28F | 30E | 32DD | 34D | 36C | 38B | 40A |
| 28FF | 30F | 32E | 34DD | 36D | 38C | 40B |
| 28G | 30FF | 32F | 34E | 36DD | 38D | 40C |
| 30G | 32FF | 34F | 36E | 38DD | 40D | |
| 30GG | 32G | 34FF | 36F | 38E | 40DD | |
| 32GG | 34G | 36FF | 38F | 40E | ||
| 34GG | 36G | 38FF | 40F | |||
| 36GG | 38G | 40FF | ||||
| 38GG | 40G | |||||
| 40GG |
To save you time whilst you're out bra shopping later, download our sister sizing chart here so you can find which size is the best fit for you.
Lounge Bra Sizes
Wireless bras and bralettes have different sizes and are measured from XS to 3XL, but you can check out our bra size guide to find your size here
From wired to non-wired bras, find a bra that fits you - not the other way around.
Don't forget, we offer hassle-free exchanges, so if you're not completely sure about your size, feel free to swap it for one that suits you better.
Step out in comfort with a bra that’s right for you.
| Lounge Size | Non-Wired Size | UK | US | EU | AUS | FR | IT |
|---|---|---|---|---|---|---|---|
| 30A | XS | 30A | 30A | 65A | 8A | 80A | 0A |
| 30B | XS | 30B | 30B | 65B | 8B | 80B | 0B |
| 30C | XS | 30C | 30C | 65C | 8C | 80C | 0C |
| 30D | S | 30D | 30D | 65D | 8D | 80D | 0D |
| 30DD | S+ / S | 30DD | 30DD/E | 65E | 8DD | 80E | 0E |
| 30E | S+ / S | 30E | 30DDD/F | 65F | 8E | 80F | 0F |
| 30F | S+ / S | 30F | 30G | 65G | 8F | 80G | 0G |
| 30FF | M | 30FF | 30H | 65H | 8FF | 80H | 0H |
| 30G | M | 30G | 30I | 65J | 8G | 80J | 0J |
| 32A | XS | 32A | 32A | 70A | 10A | 85A | 1A |
| 32B | S | 32B | 32B | 70B | 10B | 85B | 1B |
| 32C | S | 32C | 32C | 70C | 10C | 85C | 1C |
| 32D | S | 32D | 32D | 70D | 10D | 85D | 1D |
| 32DD | S+ / S | 32DD | 32DD/E | 70E | 10E | 85E | 1E |
| 32E | S+ / S | 32E | 32DDD/F | 70F | 10F | 85F | 1F |
| 32F | M | 32F | 32G | 70G | 10G | 85G | 1G |
| 32FF | M | 32FF | 32H | 70H | 10H | 85H | 1H |
| 32G | L | 32G | 32I | 70J | 10I | 85J | 1J |
| 34A | S | 34A | 34A | 75A | 12A | 90A | 2A |
| 34B | S | 34B | 34B | 75B | 12B | 90B | 2B |
| 34C | M | 34C | 34C | 75C | 12C | 90C | 2C |
| 34D | M | 34D | 34D | 75D | 12D | 90D | 2D |
| 34DD | M | 34DD | 34DD/E | 75E | 12E | 90E | 2E |
| 34E | M | 34E | 34DDD/F | 75F | 12F | 90F | 2F |
| 34F | M | 34F | 34G | 75G | 12G | 90G | 2G |
| 34FF | L | 34FF | 34H | 75H | 12H | 90H | 2H |
| 34G | L | 34G | 34I | 75J | 12I | 90J | 2J |
| 36A | M | 36A | 36A | 80A | 14A | 95A | 3A |
| 36B | M | 36B | 36B | 80B | 14B | 95B | 3B |
| 36C | M | 36C | 36C | 80C | 14C | 95C | 3C |
| 36D | L | 36D | 36D | 80D | 14D | 95D | 3D |
| 36DD | L | 36DD | 36DD/E | 80E | 14E | 95E | 3E |
| 36E | L | 36E | 36DDD/F | 80F | 14F | 95F | 3F |
| 36F | L | 36F | 36G | 80G | 14G | 95G | 3G |
| 36FF | XL | 36FF | 36H | 80H | 14H | 95H | 3H |
| 36G | XXL | 36G | 36I | 80J | 14I | 95J | 3J |
| 38A | L | 38A | 38A | 85A | 16A | 100A | 4A |
| 38B | L | 38B | 38B | 85B | 16B | 100B | 4B |
| 38C | L | 38C | 38C | 85C | 16C | 100C | 4C |
| 38D | XL | 38D | 38D | 85D | 16D | 100D | 4D |
| 38DD | XL | 38DD | 38DD/E | 85E | 16E | 100E | 4E |
| 38E | XL | 38E | 38DDD/F | 85F | 16F | 100F | 4F |
| 38F | XL | 38F | 38G | 85G | 16G | 100G | 4G |
| 38FF | XXL | 38FF | 38H | 85H | 16H | 100H | 4H |
| 38G | XXL | 38G | 38I | 85J | 16I | 100J | 4J |
| 40A | XXL | 40A | 40A | 90A | 18A | 105A | 5A |
| 40B | XXL | 40B | 40B | 90B | 18B | 105B | 5B |
| 40C | XXL | 40C | 40C | 90C | 18C | 105C | 5C |
| 40D | XXL | 40D | 40D | 90D | 18D | 105D | 5D |
| 40DD | 3XL | 40DD | 40DD/E | 90E | 18DD | 105E | 5E |