Not sure what your bra size is? Don’t worry because you’re not the only one that doesn’t know your bra size.
In this how-to guide article, you’ll learn how easy it is to find your correct bra size while using a tape measure.
This how-to-measure bra size guide is an easy step-by-step tutorial that you can do from home or anywhere you feel comfortable because it’s that simple.
What will you need:
- Soft tape measure
- Pen & paper
- Calculator (optional)
How to start the measurement?
You can do the measurement naked or put on the best suitable bra that doesn’t have any padding to it so that you can get a more accurate bra size.
- Band size – use to measure just below the bust.
- Bust size – use to determine your cup size.

Step 1. Measure for your band size
Take the soft tape measure, wrap it around your back and underneath your bust. Be sure to have the tape measure parallel around your rib cage and pointing to the ground so that it can be level.
Now round the band measurement to the nearest inch and write it down.


Step 2. Measure for your bust size
Now is to determine your cup size and how you’ll do it is pretty simple: Take the tape measure around the fullest part of your bust and make sure that it’s level suitably.
Round your bust size to the nearest inch and write it down.

Step 3. Calculate Your Cup Size
The final step now is to determine your cup size, and this is where things can get tricky because bras are not universal where one size fits all. Bra sizes are vary depending on the brand.
This guide is to give you a more accurate measurement to determine your bra size on your own.
The most accurate way to calculate your cup size is to minus the band size from your bust size and use the equal number to find your cup size below on the bra size chart.
USA size chart
Band size – Bust size = Cup size
Bust Minus Band Difference | Cup Size |
---|---|
0 | AA CUP |
1 | A CUP |
2 | B CUP |
3 | C CUP |
4 | D CUP |
5 | DD CUP |
6 | DDD CUP |
7 | G CUP |
8 | H CUP |
9 | I CUP |
10 | J CUP |
11 | K CUP |
12 | L CUP |
13 | M CUP |
14 | N CUP |
15 | O CUP |
USA Band Size Chart
Underbust (inches) | Band Size |
---|---|
27-28 | 28 |
29-30 | 30 |
31-32 | 32 |
33-34 | 34 |
35-36 | 36 |
37-38 | 38 |
39-40 | 40 |
41-42 | 42 |
43-44 | 44 |
45-46 | 46 |
47-48 | 48 |
49-50 | 50 |
51-52 | 52 |
53-54 | 54 |
International Size Chart
Size | USA | UK | Europe | Australia | Italy | France | Japan |
---|---|---|---|---|---|---|---|
0 | AA | AA | AA | - | - | AA | A |
1 | A | A | A | A | A | A | B |
2 | B | B | B | B | B | B | C |
3 | C | C | C | C | C | C | D |
4 | D | D | D | D | D | D | E |
5 | DD | DD | E | DD | DD | E | F |
6 | DDD | E | F | E | E | F | G |
7 | G | F | G | F | F | G | H |
8 | H | FF | H | FF | FF | H | I |
9 | I | G | I | G | G | I | J |
10 | J | GG | J | GG | GG | J | K |
11 | K | H | K | H | H | K | L |
12 | L | HH | L | HH | HH | L | M |
13 | M | J | M | J | J | M | N |
14 | N | JJ | N | JJ | JJ | N | O |
15 | O | K | O | K | K | O | P |
16 | P | KK | P | KK | KK | P | Q |