Bra Size Calculator
Use our easy bra size calculator to discover your exact size and get the comfort and support you deserve.
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How to Use the Bra Size Calculator (Step-by-Step)
Find your perfect bra size in seconds with our easy-to-use Bra Size Calculator. This tool helps you calculate your accurate bra size based on your band size (the measurement under your bust) and bust size (the measurement around the fullest part of your chest). Our calculator provides instant results for multiple sizing systems, including 🇺🇸 US, 🇬🇧 UK, 🇪🇺 EU, 🇫🇷 FR, 🇯🇵 JP, and 🇦🇺 AU, making it simple to find your exact fit no matter where you shop. Select your unit (cm or inches), choose your country, enter your band and bust measurements, and click Calculate to find your actual bra size.What Our Bra Size Calculator Does
Our Bra Size Calculator is designed to make sizing simple and accurate. Instead of guessing or relying on old measurements, you can enter your band and bust size to get an instant result that matches your body’s current shape. This helps you find your perfect fit, whether you’re shopping locally or from international brands. By removing confusion between different size charts, it helps you confidently find your bra size and choose bras that feel comfortable, supportive, and right for you.How to Measure Bra Size with Bra Size Calculator (Step-by-Step)
Here’s a simple step-by-step guide to measure your bra size accurately using our Bra Size Calculator. Just follow each step to get your perfect fit in seconds.Get ready
Wear a lightly lined, non-padded bra. Stand tall, relax your arms, and grab a soft measuring tape.Set up the bra size calculator
Open the Bra Size Calculator, select CM or IN, and then choose your country’s sizing system (US, UK, EU, FR, JP, AU).Measure your band (underbust)
Place the tape directly under your bust, level around your ribcage. Pull it snug, not tight. Record to the nearest ¼ inch or 0.5 cm. Enter/select this as Band Size.
Measure your bust (overbust)
Wrap the tape around the fullest part of your chest, level across your back. The tape should lie flat without squeezing. Record to the nearest ¼ inch or 0.5 cm and enter as Bust Size.
Calculate
Tap Calculate to find your bra size. You’ll see your band and cup, plus the size in your chosen country system. You’ll also see a breakdown of your band size, cup size, and country sizing system. Below your result, the tool displays sister sizes such as 38D and 42B, which have the same cup volume but different band sizes. Try these if your current band feels too tight or too loose. Finally, a “Recalculate” button allows you to recheck your measurements.
Why Wearing the Right Bra Size Matters
Wearing the right bra size does more than make your clothes look better; it helps you feel comfortable, confident, and supported all day. A properly fitted bra can improve your posture, prevent shoulder or back pain, and boost your overall comfort level. Many women don’t realize that small size differences can greatly affect how a bra fits and feels.Better Posture and Support
A well-fitting bra provides the right level of support for your bust, helping you maintain a straight, natural posture. When the band and straps fit correctly, they distribute your bust's weight evenly, reducing pressure on your shoulders and spine. This prevents slouching and keeps you comfortable whether you’re at work, walking, or relaxing.Prevents Pain and Discomfort
Wearing the wrong size can cause digging straps, tight bands, and skin irritation. Over time, it can even lead to back, neck, or shoulder pain. The right bra size avoids these issues by balancing snugness and flexibility, firm enough to support but soft enough to stay comfortable all day.Improves Shape and Appearance
The right bra can noticeably improve how your clothes fit. It enhances your natural shape, gives a smoother look under clothing, and prevents common issues like gaping cups or bulging seams. Whether you’re wearing a T-shirt, dress, or formal outfit, a properly fitted bra helps everything sit perfectly.Boosts Confidence
Comfort directly affects confidence. When your bra fits properly, you don’t have to adjust it constantly or worry about visible lines or slipping straps. You stand taller, feel more at ease, and move freely without distraction, a simple change that makes you look and feel your best.Extends the Life of Your Bras
A well-fitting bra stretches less, slips less, and wears out less. That means your bras last longer and maintain their shape and elasticity over time. Spending a few minutes to find the right bra size can save you money in the long run.Bra Size Chart
Not sure where your size falls? Use this quick-reference chart to find your band-and-cup size combination. For a full international size chart including US, UK, EU, FR, JP, and AU conversions, visit the complete bra size chart page.| Cup | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 32A | 34A | 36A | 38A | 40A | 42A | 44A | 46A | 48A | 50A | 52A |
| B | 32B | 34B | 36B | 38B | 40B | 42B | 44B | 46B | 48B | 50B | 52B |
| C | 32C | 34C | 36C | 38C | 40C | 42C | 44C | 46C | 48C | 50C | 52C |
| D | 32D | 34D | 36D | 38D | 40D | 42D | 44D | 46D | 48D | 50D | 52D |
| DD | 32DD | 34DD | 36DD | 38DD | 40DD | 42DD | 44DD | 46DD | 48DD | 50DD | 52DD |
| DDD / E | 32DDD | 34DDD | 36DDD | 38DDD | 40DDD | 42DDD | 44DDD | 46DDD | 48DDD | 50DDD | 52DDD |
| F | 32F | 34F | 36F | 38F | 40F | 42F | 44F | 46F | 48F | 50F | 52F |
| G | 32G | 34G | 36G | 38G | 40G | 42G | 44G | 46G | 48G | 50G | 52G |
| H | 32H | 34H | 36H | 38H | 40H | 42H | 44H | 46H | 48H | 50H | 52H |
What Are Sister Sizes in Bras?
Sister sizes are bra sizes with the same cup volume but different band sizes. When you go up one band size, the cup letter goes down one step to keep the volume equal. When you go down one band size, the cup letter goes up one step for the same reason. For example, if your size is 34C, your sister sizes are 32D and 36B. All three hold exactly the same amount of breast tissue. The only difference is how the band fits around your body.Why Sister Sizes Matter
Knowing your sister sizes is useful in three practical situations: when your exact size is out of stock, when your band feels right but the cup is slightly off, and when navigating sizing differences between brands. Our bra size calculator automatically shows your sister sizes alongside your result.How to Find Your Sister Sizes
Go up one band size and down one cup letter for a looser band feel. Go down one band size and up one cup letter for a firmer band feel. The cup volume stays the same either way. So if you are a 36D, your sister sizes are 34DD for a firmer fit and 38C for a looser fit.Find the Right Bra for Your Breast Shape
Getting your bra size right is only half the equation. The other half is your breast shape. Two women can wear the exact same size and need completely different bras because of how and where their breast tissue sits.
Full on Top
Full on top breasts carry more volume above the nipple line than below. Best bra types: Full coverage bras and balconette styles work well here. Avoid demi or half-cup styles.Full on Bottom
Full-on bottom breasts carry most of their volume below the nipple line. Best bra types: Balconette and plunge bras are ideal. T-shirt bras with molded cups also work well for everyday wear.East West
East-west breasts sit wide on the chest with nipples that point outward. Best bra types: Plunge bras work best. Push-up bras with side support panels also help redirect tissue toward the center.Side Set
Side set breasts sit wide apart on the chest with nipples pointing more forward. Best bra types: Plunge bras and push-up styles with a narrow gore work well for this shape.Teardrop
Teardrop breasts are rounded and fuller at the bottom with a gradual slope toward the top. Best bra types: Most bra styles work well. Plunge bras enhance the natural shape nicely.Athletic
Athletic breasts tend to be wider at the base, firmer, and have less soft tissue overall. Best bra types: Sports bras work well. For everyday wear, plunge bras and push-up styles with angled padding help add volume.Common Bra Fitting Mistakes and Their Solutions
Even with the right measurements, small fitting mistakes can make a bra feel uncomfortable all day. Here are the most common problems and exactly how to fix them.
Band Rides Up at the Back
If your bra band creeps up toward your shoulder blades throughout the day, your band size is too loose. How to fix it: Go down one band size and up one cup size; for example, swap a 36C for a 34D.Straps Dig Into Your Shoulders
Straps that leave marks aren't really a strap problem; they’re a band problem. How to fix it: Go down one band size so the band does its job. Straps should carry no more than 20% of your support.Cups Overflow or Spill at the Top
If breast tissue is spilling over the top or sides of your cups, your cup size is too small. How to fix it: Go up one cup size, for example, from a 34C to a 34D.Underwire Pokes or Digs In
Underwire should sit flat against your ribcage and fully surround your breast tissue. How to fix it: Go up one cup size and look for a deeper cup style such as full-coverage or plunge.Cup Gap or Wrinkle at the Top
Empty fabric at the top of the cup means your cup size is too large or the style is wrong. How to fix it: Go down one cup size. If gaping continues, try a molded cup style.Straps Keep Falling Off Your Shoulders
Straps that slide off usually mean the band is too loose. How to fix it: Go down one band size first. A racerback-style bra may also help if you have narrow or sloped shoulders.International Bra Size Conversion Chart
The International Bra Size Conversion Chart helps you compare bra sizes across countries.| US / UK Band | EU (EN 13402) | FR / BE / ES | JP (Japan) | AU / NZ |
|---|---|---|---|---|
| 28 | 60 | 75 | 55 | 6 |
| 30 | 65 | 80 | 60 | 8 |
| 32 | 70 | 85 | 65 | 10 |
| 34 | 75 | 90 | 70 | 12 |
| 36 | 80 | 95 | 75 | 14 |
| 38 | 85 | 100 | 80 | 16 |
| 40 | 90 | 105 | 85 | 18 |
| 42 | 95 | 110 | 90 | 20 |
| 44 | 100 | 115 | 95 | 22 |
| 46 | 105 | 120 | 100 | 24 |
| 48 | 110 | 125 | 105 | 26 |
| 50 | 115 | 130 | 110 | 28 |
International Cup Size Conversion Chart in inches and CM
The International Cup Size Conversion Chart helps you compare cup sizes across countries.International Cup Size Conversion Chart In Inches
| Difference (Bust–Band) | US/UK | EU | FR/ES | JP | AU/NZ |
|---|---|---|---|---|---|
| <1" | AA | AA | AA | AA | AA |
| 1" | A | A | A | A | A |
| 2" | B | B | B | B | B |
| 3" | C | C | C | C | C |
| 4" | D | D | D | D | D |
| 5" | DD/E | E | E | E | DD/E |
| 6" | DDD/F | F | F | F | F |
| 7" | G | G | G | G | G |
| 8" | H | H | H | H | H |
| 9" | I | I | I | I | I |
| 10" | J | J | J | J | J |
| 11" | K | K | K | K | K |
International Cup Size Conversion Chart In Centimeters
| Difference (Bust–Band) | US/UK | EU | FR/ES | JP | AU/NZ |
|---|---|---|---|---|---|
| 0–2 cm | AA | AA | AA | AA | AA |
| 2.5 cm | A | A | A | A | A |
| 5 cm | B | B | B | B | B |
| 7.5 cm | C | C | C | C | C |
| 10 cm | D | D | D | D | D |
| 12.5 cm | DD/E | E | E | E | DD/E |
| 15 cm | DDD/F | F | F | F | F |
| 17.5 cm | G | G | G | G | G |
| 20 cm | H | H | H | H | H |
| 22.5 cm | I | I | I | I | I |
| 25 cm | J | J | J | J | J |
| 27.5 cm | K | K | K | K | K |
Why Use Our Bra Size Calculator
Finding your correct bra size should be simple and stress-free. Our Bra Size Calculator provides quick, accurate results, making bra shopping easier and more reliable.Fast and Accurate Results
Enter your bust and band measurements, and the calculator instantly shows your correct size, no manual calculations needed.Works for All Countries
Whether you shop from the US, UK, Europe, France, Japan, or Australia, the tool automatically converts your measurements to match international sizing standards.Data Privacy Ensured
Your measurements are not stored or shared. Everything you enter stays private and secure.Free and Mobile-Friendly
The tool is free to use and works smoothly on mobile, tablet, and desktop devices, with no downloads or registration required.Popular Bra Size Guides
Popular Bra Types Guides
Find your perfect styleBralette
Wire-free comfort for everyday wear
Push-Up
Lift and enhance your natural shape
T-Shirt
Smooth, seamless under fitted tops
Sports
Support and comfort for active wear
Strapless
Versatile style for off-shoulder looks
Balconette
Low-cut cups with a flattering lift
Frequently Asked Questions
What’s the best way to measure bra size at home?
Use a soft measuring tape to measure your band size (around your ribcage, just under the bust) and bust size (around the fullest part of your chest). Subtract the band from the bust measurement to find your cup size, or simply use our bra size calculator.How often should I recheck my size?
Remeasure every 6 to 12 months, or after any noticeable body changes such as weight gain, weight loss, or pregnancy.Is my bra size the same in every brand?
No. Different brands may vary slightly in sizing. Always check the brand’s size chart or try on bras to confirm your best fit.What if I’m between two band sizes?
If you are between sizes, choose the larger band size for comfort and adjust the cup size down (for example, from 34C to 36B).Can I calculate my bra size without a measuring tape?
While a measuring tape gives the most accurate results, you can use a string and ruler as an alternative. Wrap the string around your bust and band area, then measure its length with a ruler.How to measure bra size in the UK and India?
Measuring your bra size in the UK and India is the same. Measure your band and bust size, then subtract the band from the bust to find your cup size. Both countries use the same sizing method and chart system.Ready to find your perfect bra size?
Enter 2 measurements. Get instant results in US, UK, EU, FR, JP and AU sizing.
✓ 6 sizing systems
✓ Sister sizes included
✓ Free, no sign-up
Use the Bra Size Calculator
Takes less than 60 seconds