How do I measure?

For the utmost support and comfort, it's vital that you are wearing a bra that fits you and your unique shape.

We recommend getting fitted or measuring yourself every 6 months to make sure you are still wearing the correct bra size, ensuring maximum support and comfort for your breasts. We've put together a guide to show you how to measure your bra size and how to tell if a bra size doesn’t fit you, helping you to find the perfect fit.

Please note that this measuring guide is a starting point for finding your perfect fit. It often takes a little trial and error when finding your correct size, meaning you may need to order a few sizes to find your flawless fit. But luckily we have free returns so there is no need to worry!

How to Measure

In just two simple steps

How to measure your band

This is best measured without wearing a bra for optimum results.

Using a soft measuring tape, stand upright and place the measuring tape under your breasts - this is where your bra band would usually sit. Making sure the tape is parallel measure all the way round from the front to the back, pull the tape firmly to take an accurate measurement.

The tape should feel firm but not restrictive, this is because your bra underbust fabric will stretch a lot more than the tape measure.

Make sure you measure in centimetres and type the number into our bra calculator in the ‘Band Size’ field.

How to measure your cup

To obtain your bust measurement, measure over the fullest part of your bust, keeping the tape parallel all the way round the body.

Keep the tape measure firm but do not pull tightly. For best results it is suggested to not wear a bra, or if you prefer, a non-padded style (for example a soft cup bralette). This will ensure the measurement to be as accurate as possible.

Make sure to measure in centimetres and type the number into our bra calculator in the ‘Cup Size’ field. This will then give you a great starting point on your cup size.

Remember - you may be different cup sizes in different brands, or even in the same brand but different style.

Calculate Your Size

Questions & Answers

How to fit when you are pregnant?

Throughout your first trimester we would suggest fitting yourself or get yourself fitted for a new bra as your breasts start to grow and feel more tender.

When measuring yourself using our ‘How to Measure’ guide, follow the steps as normal and then go up 1 band size. Fit this on the tightest hook (instead of the loosest) so you can move this along the hooks to loosen the band as you need. For example, if you are measuring at a 32-band size, go up to a 34 and wear this on the tightest hook. This will ensure maximum comfort and allow room for your rib cage to increase in size.

For the cup size, measure yourself using our ‘How to Measure’ guide and then add 2 cup sizes to what you measure to allow room for your breasts to grow throughout your first trimester. You will more than likely need to find another new bra towards the end of your first trimester/ beginning of your second trimester as your breasts continue to grow. It is important that the cup encases all of your breast and doesn’t dig into the breast tissue.

Non-wired bras are perfect as you will find that wired bras will not last long and will start to feel uncomfortable. Click to browse our full range of Wire-Free Bralettes.

The Sloggi ZERO Feel range is made from a luxuriously soft lightweight fabric and features removable padded cups and seam-free cups for maximum comfort. This could be a great option if you are not too sure where to start.

Throughout your second trimester we would suggest measuring yourself again as above, ensuring the band size is on the tightest hook so it can expand throughout your second trimester and keep you feeling comfortable. Still ensure that the cups are not too tight and encasing all of your bust.

For your third trimester you may want to start looking at bras which will last you through to breastfeeding. This can include seamless non-padded non-wired bras. Your rib cage will continue to expand until about 37 weeks so it is important to make sure you still have room in your band size to loosen it when needed. You will also need to allow extra room in the cup as your breasts will grow when your milk comes in. Make sure the cups are not pressing too tight against your milk ducts they can become blocked which can lead to complications including mastitis.

When you are around 36-37 weeks pregnant it is a good idea to start fitting yourself for your nursing bras. As your band size is the largest it is most likely going to be, it is a good idea to fit this on the loosest hook as when you have had the baby you can tighten it if needed to ensure your breasts are fully supported. It is a good idea to go up a cup size to allow room for your milk to come in.

Read more about suitable bras for throughout your pregnancy in our Magazine.

How to fit post pregnancy?

For your early days of breastfeeding, you may find that measuring your breasts at their fullest (just before you feed) will give you the largest cup size you will need. Measure your band size as normal on our guide, keeping this on the loosest hook. Make sure to still use the rule if you go up a band size, you go down a cup size to keep the cup fitting the same. For example a 34F fits the same on the cup as a 36E, yet the band is bigger.

3 months post birth

As your milk supply starts to calm, your cup size may decrease and therefore you may need to adjust you cup size, so it is fitting correctly but not digging into the breast tissue and still encasing all of your bust.

How to fit for your daughters first bra

Girls develop at any age from 8-14, so there is no specific time you should buy a first bra, just when she is physically and emotionally ready. Read more about how and when to buy your daughter a bra in our Magazine.

When fitting use our guide above for measuring. For the band size we suggest you fit this on the tightest hook (instead of the loosest) to allow room for growth. Therefore, you may need to go up a band size to what she measures and then fit this on the tightest hook.

For the cup size we suggest that you go up 1 or 2 cup sizes than she measures to allow room the breast tissue to grow. Still make sure that she is comfortable wearing it and it isn’t too baggy as she may feel uncomfortable.