Calculate your bra size and convert between US, UK, EU, French, and Australian sizing systems
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BRA
Bra Size Calculator
Enter your bust measurement (around fullest part of chest) and band measurement (directly under bust). Measure to the nearest 1/4 inch or 0.5 cm.
Loose circumference over fullest part of breasts
Firm circumference directly under breasts
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CVT
Bra Size Converter
Convert your bra size between different country sizing systems.
HOW
How to Measure Your Bra Size
Follow these steps carefully for the most accurate measurement. Use a soft measuring tape and wear a non-padded bra or no bra.
1
Measure Your Band SizeWrap the measuring tape snugly (but not tight) around your ribcage, directly under your bust. Keep the tape parallel to the floor. Round to the nearest whole number. This is your underbust / band measurement.
2
Measure Your Bust SizeWrap the tape loosely around the fullest part of your chest (across the nipples). Keep the tape parallel to the floor and do not pull it tight. Round to the nearest whole number. This is your bust / overbust measurement.
3
Calculate the DifferenceSubtract your band size from your bust size. This difference determines your cup size. For example: Bust 38" - Band 34" = 4" difference = D cup.
4
Find Your Bra SizeCombine your band number with your cup letter. Example: 34 band + D cup = 34D. Enter these measurements in the calculator for your international size.
Tips for Accurate Measurement
Measure to the nearest 1/4 inch or 0.5 cm for best accuracy.
Measure while wearing a non-padded bra or bralette.
Stand straight with your arms at your sides.
Take measurements 3 times and use the average.
Sizes vary between brands — always try before you buy when possible.
Signs of an Incorrect Fit
Band riding up at the back | Straps digging into shoulders | Underwire poking or lifting | Cups overflowing or gaping | Center panel not lying flat | Red marks or discomfort after wear
REF
Band Size Reference
International band sizes across all major sizing systems.
Label
US / UK
EU (EN 13402)
FR / BE / ES
AU / NZ
XXS
28
60
75
6
XS
30
65
80
8
S
32
70
85
10
M
34
75
90
12
L
36
80
95
14
XL
38
85
100
16
XXL
40
90
105
18
3XL
42
95
110
20
4XL
44
100
115
22
5XL
46
105
120
24
CUP
Cup Size Reference (by Difference in Inches)
Cup size is determined by the difference between bust and band measurements.