How to measure your bra size

A well-fitted bra is supportive and feels comfortable. Check my measuring guide and get your sizes right!

What’s your bra size? See my calculator

Marks and Spencer Lingerie

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1. How to measure your bra size

• are you not happy with your bra right now?
• have you never really had the feeling of a well-fitted bra?
• maybe your body and breasts have changed?
• looking for your first bra?

It might be time to do a little measuring.

You’ll need 10 to 20 minutes to do your measurements and look up your bra size in a chart or calculator.

At Marks and Spencer, you’ll find advice and tips on styles to suit you | M&S BraFit Guide

Step 1   Measure your band size

• hold the tape around your underbust
• pull it a bit tight
• write down the inches or centimeters

Step 2   Measure your cup size

Do you want to know your cup size?

As bras with different band sizes can have the same cup volume, it’s a first to get that band right.

• hold the measuring tape around the fullest part of your breasts
• don’t pull too tight
• write down the inches or centimeters

No measuring tape? You could try the fruit method to find your cup size.

Knowing your sizes will give you more control when shopping for a bra. You might be just in between two different bra sizes. Also depending on the bra style and brand, you might wanna try them both.

2. UK bra size chart and how to use it

Your best bra size may not be the bra size you wear at this moment. A check might give you a whole new insight into the size you are used to.

Knowing your measurements brings you to the final step, finding your best bra size in a UK bra size chart.

3. How often does a bra size change?

Maybe you lost some weight or gained some. There are lots of reasons our bodies and breasts change.

Take some time to think about your bra. And look at it with all honesty. Do I need a new bra size?

4. Why wash your bras regularly?

Washing your bras regularly (by hand) is needed to clean and strengthen the elastic fibers.

And did you know it’s best to rotate between your bras and give them a rest?

5. Bra sister sizes do I have one?

Most women are just in between two different bra sizes. What will you choose then?

Going up or down a band size changes your cup volume as well.

For example, 42B, 40C, and 38D all have the same cup volume, more about sister sizing

6. Determine your best bra band size

Always start with your bra band size first.

There are about 14 different band sizes. Although not every brand has the whole range of band sizes 28 – 54. This is how you find your best bra band size

7. Bra band size too small?

Most support from a bra comes from its band. But we surely don’t need a bra band that is too tight.

8. Small bra size chart

Bra cups AA and AAA are often not listed in an ordinary bra size chart. If you do check the wrong chart you likely end up with a cup size too big.

Check out my small bra size chart for AAA-B

9. Why measure at home?

Learn your best bra size today and easily measure your sizes at home.

10. The average bra size in the UK

Women’s breasts have unique shapes and sizes. No wonder there are over 100 different bra sizes. But what’s the average UK size?

My bra guides

Bras for AAA-C cups
Bras for D+ cups
Bra calculator
Comfy Loungewear Guide
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