To measure your bra size in the UK, follow these steps:

1. Measure Your Band Size (Ribcage)

• Stand in front of a mirror with a soft measuring tape, ideally without a bra or wearing a non-padded bra.
• Wrap the tape measure snugly around your ribcage, just under your bust where your breast meets your ribs. Ensure the tape is parallel to the floor.
• Note the measurement in inches. If the number is odd, round up to the nearest even number (e.g., 33 inches rounds to 34). This number is your band size (e.g., 34, 36, 38)

2. Measure Your Bust Size

• With the tape measure, wrap it around the fullest part of your bust, keeping it straight and parallel to the floor.
• The tape should be snug but not tight or digging into your skin.
• Note this measurement in inches and round to the nearest whole number

3. Calculate Your Cup Size

• Subtract your band size from your bust measurement.
• The difference in inches corresponds to your cup size according to this UK standard:

Difference (inches)| Cup Size
---|---
0-1| A
2| B
3| C
4| D
5| DD
6| E
7| F
8| FF
9| G
10| GG
11| H
12| HH
13| J
14| JJ
15| K

For example, if your bust is 37 inches and your band size is 34 inches, the difference is 3 inches, so your cup size is C, making your bra size 34C

Summary

• Measure underbust snugly → round to nearest even number = band size
• Measure fullest bust → round to nearest whole number = bust size
• Subtract band from bust → difference = cup size

This method provides a good starting point for UK bra sizing, though fit can vary by brand and style