👙 Bra Size Calculator

Calculate bra size based on measurements

Band Size (inches)

inches

Measure around your ribcage, just under your bust

Bust Size (inches)

inches

Measure around the fullest part of your bust

Bra Size Result

Your Bra Size

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Understanding Bra Sizing

A bra size calculator is an essential tool that helps you determine your correct bra size based on accurate band and bust measurements. Proper bra sizing is crucial for comfort, support, posture, and overall appearance. Wearing the wrong bra size can lead to discomfort, back pain, poor posture, and even health issues over time.

This calculator uses standard sizing methods based on the difference between your band size (ribcage measurement) and bust size (fullest part of your bust). The band size represents the number (e.g., 32, 34, 36), while the cup size (A, B, C, D, etc.) is determined by the difference between these measurements. For the most accurate fit, it’s always recommended to get professionally fitted at a reputable lingerie store, as factors like breast shape, density, and body type can affect the perfect fit.

Important Note:
Bra sizes can vary between brands and styles. This calculator provides a starting point, but you may need to try different sizes or styles to find your perfect fit. Many women wear different sizes in different brands.

Why Proper Bra Sizing Matters

Wearing the correct bra size offers numerous benefits:

Comfort: A properly fitted bra eliminates discomfort, pinching, and chafing throughout the day
Support: Correct sizing provides optimal support, reducing strain on your back and shoulders
Posture: Well-fitted bras improve posture and reduce back pain
Appearance: The right size enhances your silhouette and makes clothes fit better
Confidence: Feeling comfortable and supported boosts confidence
Health: Proper support can prevent long-term issues like back pain and poor posture

How to Measure Your Bra Size Accurately

Getting accurate measurements is the key to finding your correct bra size. Follow these steps carefully for the best results:

Step 1: Measure Your Band Size

Your band size is the measurement around your ribcage, just under your bust. Here’s how to measure:

Wear a non-padded bra or no bra for the most accurate measurement
Stand straight with your arms at your sides
Wrap a flexible measuring tape around your ribcage, directly under your bust
Keep the tape level and snug (but not tight) around your body
Make sure the tape is parallel to the floor
Read the measurement in inches
If the measurement is an odd number, round up to the nearest even number (e.g., 33 inches becomes 34)

Step 2: Measure Your Bust Size

Your bust size is the measurement around the fullest part of your bust. Follow these steps:

Stand straight with your arms at your sides
Wrap the measuring tape around the fullest part of your bust (usually at nipple level)
Keep the tape level and parallel to the floor
Don’t pull the tape too tight—it should be snug but comfortable
Make sure the tape isn’t twisted
Read the measurement in inches

Step 3: Calculate Your Cup Size

Your cup size is determined by the difference between your bust measurement and band measurement:

0-1 inch difference: AA cup
1 inch difference: A cup
2 inch difference: B cup
3 inch difference: C cup
4 inch difference: D cup
5 inch difference: DD/E cup
6 inch difference: F/DDD cup
7 inch difference: G cup
8 inch difference: H cup
9+ inch difference: Larger cup sizes (I, J, K, etc.)

Understanding Bra Size Components

Band Size (The Number)

The band size is the number in your bra size (e.g., 32, 34, 36, 38). This represents the measurement around your ribcage in inches. The band should fit snugly and provide most of the support. Common band sizes range from 28 to 44 inches, though extended sizes are available.

Cup Size (The Letter)

The cup size is the letter in your bra size (e.g., A, B, C, D, DD). This represents the difference between your bust and band measurements. Cup sizes are not absolute—a 34C has a different cup volume than a 36C. As the band size increases, the cup volume increases even if the letter stays the same.

Common Bra Size Misconceptions

“D cup is always large”: Cup size is relative to band size. A 32D has a smaller cup volume than a 38C
“I’m always the same size”: Your size can change due to weight fluctuations, pregnancy, age, and hormonal changes
“All brands fit the same”: Sizing varies significantly between brands, so always try before buying
“The band should be loose”: The band should be snug—it provides 80% of the support

Signs Your Bra Doesn’t Fit Correctly

If you experience any of these issues, your bra may not be the right size:

Band Issues

Band rides up in the back
Band feels too tight or too loose
Band digs into your skin
You need to use the tightest hook when new

Cup Issues

Breasts spill over the top or sides
Gap between cup and breast
Cups wrinkle or pucker
Underwire sits on breast tissue

Comfort Issues

Shoulder straps dig in
Back pain or shoulder pain
Red marks that last more than 30 minutes
Constant adjusting throughout the day

Tips for Finding the Perfect Bra Fit

When Trying On Bras

Try multiple sizes: Don’t assume you’re always the same size—try your calculated size and one size up and down
Check the band: The band should be snug on the loosest hook when new (allows for stretching over time)
Adjust straps: Straps should be tight enough to provide support but not dig into shoulders
Check the gore: The center piece between cups should lie flat against your chest
Move around: Jump, bend, and move to ensure the bra stays in place
Check from all angles: Look at your profile to ensure the bra creates a smooth silhouette

Different Styles for Different Needs

Full coverage: Best for larger cup sizes and maximum support
Balconette: Great for smaller to medium sizes, creates lift
Sports bras: Essential for physical activity, provide compression and support
Wireless: Comfortable option for everyday wear
Push-up: Enhances cleavage and provides lift
T-shirt bras: Smooth, seamless option under fitted clothing

Frequently Asked Questions

How do I measure my bra size accurately?

Measure your band size around your ribcage just under your bust, keeping the tape snug but not tight. Measure your bust size around the fullest part of your bust, keeping the tape level and parallel to the floor. The difference between these measurements determines your cup size. For best results, measure while wearing a non-padded bra or no bra, and stand straight with your arms at your sides.

Why does my bra size vary between brands?

Bra sizing varies between brands due to different manufacturing standards, design philosophies, and target markets. European brands often run smaller than American brands, and some brands are known for running large or small. Additionally, different bra styles (full coverage, balconette, push-up) may fit differently even within the same brand. Always try on bras before purchasing, especially when trying a new brand.

How often should I measure my bra size?

You should remeasure your bra size whenever you experience significant weight changes (gain or loss of 10+ pounds), after pregnancy and breastfeeding, during hormonal changes, or if you notice your current bras no longer fit well. It’s also a good idea to get professionally fitted annually, as your body can change over time. Many women find their size changes throughout their menstrual cycle as well.

What if my calculated size doesn’t fit well?

The calculated size is a starting point, not a definitive answer. Many factors affect bra fit, including breast shape, density, body type, and personal preference. Try the calculated size, but also try one size up and down in both band and cup. For example, if you calculate as 34C, also try 32D, 34B, 34D, 36B, and 36C. The best fit is what feels comfortable and looks good on you.

Should the bra band be tight or loose?

The bra band should be snug but comfortable. It should fit firmly on the loosest hook when the bra is new (allowing room for the bra to stretch over time). The band provides 80% of the support, so it needs to be secure. However, it shouldn’t be so tight that it causes discomfort, red marks that last, or difficulty breathing. If the band rides up in the back, it’s too loose.

What’s the difference between DD and E cup sizes?

DD and E are often the same cup size, but the labeling depends on the brand and country. In US sizing, DD is typically used, while UK sizing often uses E. Some brands use both. The important thing is to understand that after D cup, sizing can vary: DD/E, DDD/F, G, H, etc. Always check the brand’s specific sizing chart, as cup progression can differ between manufacturers.

Can I measure myself, or do I need professional fitting?

You can measure yourself using this calculator, and many women successfully find their size this way. However, professional fitting at a reputable lingerie store can be more accurate, especially for first-time fittings or if you’re having trouble finding the right fit. Professional fitters are trained to consider factors like breast shape, density, and asymmetry that measurements alone don’t account for.

Why do my breasts spill over even though I’m wearing the right size?

If your breasts are spilling over, you likely need a larger cup size. Try going up one or two cup sizes while keeping the same band size (e.g., if 34C spills, try 34D or 34DD). Also, consider trying a full-coverage style rather than a demi or balconette bra. Spillage can also occur if the bra style doesn’t match your breast shape—some women need more coverage or different cup shapes.

How do I know if my bra fits correctly?

A well-fitting bra should: have a band that sits level around your body (not riding up), cups that fully contain your breasts without gaps or spillage, straps that stay in place without digging in, a center gore (the piece between cups) that lies flat against your chest, and overall comfort throughout the day. You should be able to move, bend, and jump without the bra shifting significantly.

What if I have asymmetrical breasts?

It’s very common to have slightly different-sized breasts. Fit the bra to your larger breast, and use padding or inserts in the smaller side if needed. Some brands offer bras with removable padding that can help balance asymmetry. If the difference is significant, consider getting professionally fitted, as fitters can help you find the best solution for your specific situation.