Bra Size Calculator Online Free Tool
Bra Size Calculator
Bra Size Calculator
Results
US/Canada
UK
EU
AU/NZ
Difference: 0 cm (0 inches)
Cup Size Distribution
Quick Size Guide
Bust Measurement:
Measure around the fullest part of your chest
Band Measurement:
Measure directly underneath the breasts
Tip:
Measure without a bra or with a non-padded bra for accuracy
Measurement Guidelines
Measurement Areas Guide
Bust Size Measurement
The bust size is the loose circumference measured around the chest over the fullest part of the breasts, while standing straight with arms to the side, and wearing a properly fitted bra.
Band Size Measurement
The band or frame size is the firm circumference, fitted not tightly, measured directly underneath the breasts.
Step-by-Step Measurement Process
Understanding Bra Fit Issues
Incorrect Bra Fit Statistics
Surveys and studies often cite that anywhere between 70-85% of women wear incorrectly fitted bras. While data collection methods between various sources is not consistent and these percentages may be inflated, incorrectly fitted bras are nonetheless a significant issue, evidenced by the number of studies, articles, and complaints surrounding the issues women face due to a lack of size standardization.
Studies have revealed that the most common mistake made by women when selecting a bra was to choose too large a back band and too small a cup. Part of the issue is the lack of standardization regarding band and cup sizes.
Signs of Poor Bra Fit
Signs of Proper Bra Fit
International Size Conversion Tables
Band Size Conversion Chart
| Size | FR/BE/ES | EU Standard | US/UK | AU/NZ |
|---|---|---|---|---|
| XXS | 75 | 60 | 28 | 6 |
| XS | 80 | 65 | 30 | 8 |
| S | 85 | 70 | 32 | 10 |
| M | 90 | 75 | 34 | 12 |
| L | 95 | 80 | 36 | 14 |
| XL | 100 | 85 | 38 | 16 |
| XXL | 105 | 90 | 40 | 18 |
US/UK Cup Size Chart
| Difference (inches) | US Cup | UK Cup |
|---|---|---|
| <1 | AA | AA |
| 1 | A | A |
| 2 | B | B |
| 3 | C | C |
| 4 | D | D |
| 5 | DD | DD |
| 6 | DDD | E |
EU Cup Size Chart
| Difference (cm) | EU Cup Size |
|---|---|
| 10-11 | AA |
| 12-13 | A |
| 14-15 | B |
| 16-17 | C |
| 18-19 | D |
| 20-21 | E |
| 22-23 | F |
Professional Fitting Tips & Advice
When to Get Measured
Weight Changes
Remeasure after gaining or losing 10+ pounds as this affects both band and cup size.
Life Changes
Hormonal changes, pregnancy, breastfeeding, and menopause can alter breast size and shape.
Age Considerations
Breast shape and size change with age, requiring size reassessment every 1-2 years.
Measurement Best Practices
Time of Day
Measure in the morning when breasts are at their natural size, before hormonal fluctuations.
Proper Posture
Stand straight, breathe normally, and keep arms relaxed at sides for accurate measurements.
Multiple Measurements
Take measurements 2-3 times and use the average for better accuracy and consistency.
Size Standardization Issues
These vary largely between countries, and even manufacturers, making it difficult to use these measures as anything more than an approximate fit. A 34B bra from two different companies, for example, may not fit the same person because of this lack of standardization.
Brand Variations
Same size can fit differently across brands due to varying construction methods and sizing standards.
Regional Differences
Cup and band sizing systems vary significantly between US, UK, European, and Asian markets.
Style Impact
Different bra styles (push-up, sports, wireless) may require different sizes for optimal fit.
Professional Fitting Recommendation
While this calculator provides a good starting point, professional bra fittings at lingerie stores can provide personalized advice considering breast shape, tissue distribution, and individual comfort preferences. Many specialty stores offer free fitting services and can recommend specific brands and styles that work best for your unique measurements and needs.
Finding the right bra size requires two measurements: band size (the circumference around the rib cage just under the bust) and cup size (the difference between bust measurement and band measurement). This calculator finds your starting bra size and converts between US, UK, European, French, Australian, and Japanese sizing systems.
How to Measure Bra Size
Use a soft measuring tape. Wear a well-fitting non-padded bra or no bra.
Step 1: Band size Measure snugly around ribcage just under bust (in inches) If measurement is even: add 4 inches → band size If measurement is odd: add 5 inches → band size Step 2: Cup size Measure loosely around fullest part of bust Difference = Bust - Band < 1 inch = AA, 1 inch = A, 2 inches = B 3 inches = C, 4 inches = D, 5 inches = DD/E 6 inches = DDD/F, and so on
This is a starting point. Fit varies significantly by brand and style.
International Size Conversion
| US/Canada | UK | EU (France) | Australia |
|---|---|---|---|
| 32A | 32A | 70A | 10A |
| 34B | 34B | 75B | 12B |
| 36C | 36C | 80C | 14C |
| 38D | 38D | 85D | 16D |
| 40DD | 40DD | 90E | 18DD |
Frequently Asked Questions
Why do different brands fit differently?⌄
Bra sizing is not standardized across manufacturers. The same size in different brands can fit very differently due to variations in wire width, cup depth, band stretch, and strap positioning. The "+4 inch" method gives a starting size, but finding your best fit usually requires trying several sizes and styles. Sister sizes (same cup volume, different band) can help when the exact size is not available.
What are sister sizes?⌄
Sister sizes are different bra sizes that contain the same cup volume. Moving one band size up and one cup size down (or vice versa) gives a sister size: 34C and 36B and 32D are all sister sizes. If a 34C fits in the cups but the band is too tight, try a 36B. The cups are the same volume but the band is larger.
How often should I measure my bra size?⌄
Body weight changes, pregnancy, breastfeeding, hormonal changes, and aging all affect bra size. Getting measured annually or any time you notice a poor fit is recommended. Most fitting problems (underwires poking, straps falling off, fabric wrinkling) are actually size issues rather than quality issues.
What does a properly fitting bra feel like?⌄
The band should be level all around and feel snug but not constricting on the loosest hook. The underwire (if present) should lie flat against the rib cage, not floating on breast tissue. Cups should be smooth with no spillage or wrinkling. Straps should not dig in or slip off with normal movement. The center gore should lie flat against the sternum.