Find Your Perfect Fit

We understand that it can be daunting to buy a bra without trying it on, so we’ve created a measuring guide and size calculator to help you find your perfect fit.

Sizes can vary between brands and it’s common for your size to change over time, so we recommend measuring even if you already know your size.


What You’ll Need

  • Measuring tape (inches)
  • Your favourite unpadded or lightly lined bra
  • Our simple size calculator (below)

Band Size

  1. Measure around your body just under your bust, where a bra band would sit
  2. Make sure the measuring tape is snug but not too tight, is level at the front and back, and sits flat against your skin
  3. Round up to the nearest whole number and type it into the calculator below

Cup Size 

  1. Wearing an unpadded bra, measure around the fullest part of your bust, which is usually in line with the nipples
  2. Don’t wrap the tape around you too tightly, you can keep it fairly loose (but not too loose that it falls down).
  3. Again make sure that the measuring tape is level at the front and back, and sits flat against your skin
  4. Round up or down to the nearest whole number and type it into the calculator below


Bra Size Calculator



Without the Calculator...  

Use the below table to work out your size without the calculator.


UNDERBUST 28-30" 30-32" 32-34" 34-36" 36-38" 38-40" 40-42"
BAND SIZE 30 32 34 36 38 40 42
DIFFERENCE 1" 2" 3" 4" 5" 6" 7"


More On The Fit... 

One backband for multiple sizes - our bras are also more widely size adjustable than most on the market, with each one being able to accommodate up to three back sizes.

One Daylight size will accommodate multiple bra sizes, meaning our product range is smaller whilst still being able to fit many bodies. For example the cup on a 32C is equivalent to that of a 30D and 34B. With our back design, one bra can fit all three of these sizes whilst remaining comfortable offering plenty of support.

This not only means it's fully adjustable but it also is more sustainable. By making a bra which can be worn by multiple sizes, we're creating less products. This means we can produce more efficiently and creates less waste.



Extra Support

 We understand that some sizes require a little more to give the support you need, that's why we've made some changes to our bigger cup sizes. Sizes 34E/36DD/38D, 36E/38DD/40D and 38E/40DD/42D feature wider elastic around the band and the straps and our Ray bra has a three part cup (rather than two part) to give you all the support you need.