Bra Size Calculator

Find Your Perfect Bra Size with Our Advanced Calculator

Finding the right bra size can transform your comfort, confidence, and overall well-being. Our comprehensive bra size calculator takes the guesswork out of bra shopping by providing accurate measurements across multiple international sizing systems. Whether you’re shopping locally or internationally, our tool ensures you get the perfect fit every time.

Studies consistently show that a significant majority of women wear incorrectly fitted bras, leading to discomfort, poor posture, and reduced confidence. With our advanced calculator, you can determine your exact size using professional measurement techniques and industry-standard formulas used by lingerie experts worldwide.

How to Use the Bra Size Calculator

Getting accurate results from our calculator is simple when you follow these step-by-step instructions:

Step 1: Choose Your Measurement Unit

Select whether you prefer to measure in inches or centimeters. The calculator automatically converts between units and adjusts the interface accordingly.

Step 2: Take Your Band Measurement

Measure around your ribcage directly under your breasts. Keep the measuring tape snug but not tight, ensuring it sits parallel to the ground. This measurement determines your band size, which provides the primary support for your bra.

Pro tip: Take this measurement while wearing a non-padded bra or no bra at all for the most accurate results.

Step 3: Take Your Bust Measurement

Measure around the fullest part of your bust, typically across your nipples. Keep the measuring tape level and avoid pulling it too tight. This measurement, combined with your band measurement, determines your cup size.

Step 4: Select Your Preferred Sizing System

Choose from six international sizing systems: United States, United Kingdom, European Union, Australia, France, or Japan. The calculator provides your size in your selected system and automatically converts to all other systems.

Step 5: Calculate and Review Results

Click the calculate button to receive your comprehensive results, including your main size, international conversions, and sister sizes for alternative fitting options.

Understanding Your Results

Your Primary Bra Size

Your main result shows your calculated bra size in your chosen sizing system. This size follows industry-standard calculation methods used by professional bra fitters and major lingerie brands.

International Size Conversions

The calculator provides equivalent sizes across all major international sizing systems. This feature proves invaluable when shopping online from international retailers or traveling abroad.

Sister Sizes Explained

Sister sizes are different bra sizes that provide the same cup volume with different band fits. For example, if your calculated size feels too tight in the band, you can try the sister size with a larger band and smaller cup letter for the same cup volume but looser band fit.

Benefits of Proper Bra Fitting

Enhanced Comfort and Support

A properly fitted bra eliminates common issues like digging straps, sliding bands, and uncomfortable pressure points. The right size provides optimal support without restriction, allowing you to move freely throughout your day.

Improved Posture and Health

Correct bra support helps maintain proper posture by distributing weight evenly across your shoulders and back. This reduces strain on your neck, shoulders, and spine, potentially alleviating related discomfort.

Better Clothing Fit

When your bra fits correctly, your clothes fit better too. Proper support creates a smooth silhouette under clothing and ensures garments hang correctly on your body.

Increased Confidence

Wearing the right bra size boosts confidence by providing security and comfort. You’ll feel more confident in your appearance and move with greater ease.

Cost Savings

Knowing your correct size reduces the likelihood of purchasing ill-fitting bras that you won’t wear, saving money in the long run and reducing returns when shopping online.

Essential Measuring Tips

Best Time to Measure

Take measurements during the middle of your menstrual cycle when breast size is most consistent. Avoid measuring during times when your breasts may be swollen or tender.

What to Wear

Wear your best-fitting, non-padded bra when taking measurements, or measure without a bra for the most accurate band measurement.

Proper Measuring Technique

Stand straight with your arms at your sides. Have someone help you measure if possible, as this provides more accurate results than measuring yourself.

Multiple Measurements

Take each measurement two or three times to ensure accuracy. If measurements vary, use the average or the measurement that feels most comfortable.

Regular Remeasuring

Remeasure yourself every six months or whenever you experience significant weight changes, pregnancy, or other factors that might affect your size.

When to Consider Professional Fitting

Complex Fitting Needs

If you have significant size differences between breasts, have undergone breast surgery, or experience persistent fitting issues, consider consulting a professional bra fitter.

Special Occasions

For important events, special occasion lingerie, or expensive bra purchases, professional fitting ensures optimal results.

Sizing Confusion

If our calculator results don’t align with your current bra experience or if you’re unsure about the fit, a professional fitting can provide personalized guidance.

Shopping Tips for Different Bra Styles

T-Shirt Bras

For everyday smooth coverage under fitted clothing, stick closely to your calculated size. T-shirt bras typically fit true to size across most brands.

Push-Up Bras

You might need to go up one cup size in push-up styles due to the additional padding and different cup construction.

Sports Bras

Sports bras often run smaller and may require sizing up, especially in high-support styles. Check each brand’s specific sizing recommendations.

Wireless Bras

Wireless styles may require different sizing due to the lack of underwire structure. Some women prefer to size up in the band for additional comfort.

Specialty Sizes

If you fall into specialty sizing categories (very small or large sizes), pay extra attention to brand-specific sizing charts, as these can vary significantly between manufacturers.

Troubleshooting Common Fit Issues

Band Too Tight

If the calculated band size feels too tight, try the sister size with a larger band. Remember that bands should feel snug initially but will stretch with wear.

Band Too Loose

A loose band fails to provide proper support. Try the sister size with a smaller band, or ensure you’re measuring correctly with a firm but not tight tape measure.

Cup Spillage

If you experience spillage over the cups, try going up one cup size while keeping the same band size, or check if you need a different bra style for your breast shape.

Cup Gaping

Gaping cups might indicate a cup size that’s too large, the wrong bra style for your breast shape, or the need for a different cup construction.

Strap Issues

If straps dig in or slide off, this often indicates an incorrect band size rather than a strap problem. A properly fitted band should carry most of the bra’s support weight.

Frequently Asked Questions

How often should I remeasure my bra size?

Remeasure every six months or whenever you experience weight changes of 10 pounds or more, pregnancy, or significant life changes that might affect your body shape.

Why do different brands fit differently even in the same size?

Bra sizing isn’t standardized across brands. Each manufacturer may use slightly different measurements and construction methods, leading to fit variations even within the same stated size.

Can I rely solely on this calculator for online shopping?

Our calculator provides an excellent starting point based on industry standards, but always check individual brand sizing charts and return policies when shopping online, as fit can vary between manufacturers.

What if my measurements fall between sizes?

If you’re between sizes, consider your personal comfort preferences. Those who prefer a firmer fit might choose the smaller size, while those who prioritize comfort might opt for the larger size.

How do I know if a bra fits correctly?

A well-fitted bra should have a band that sits parallel to the ground, cups that fully contain breast tissue without spillage or gaping, a center gore that lies flat against your chest, and straps that stay in place without digging in.

Should I size differently for different bra types?

Yes, different bra styles may require slight size adjustments. Sports bras often run smaller, while some wireless styles might require sizing up for comfort.

What if my calculated size seems very different from what I currently wear?

Size discrepancies are common, as many people wear incorrect sizes. Start with the calculated size when trying new bras, but remain open to minor adjustments based on fit and comfort.

How do international sizes compare?

While our calculator provides conversions, international sizes can vary between brands. UK and US sizes are similar until larger cup sizes, while European sizes use centimeters for band measurements.

Can weight fluctuations affect my bra size?

Yes, weight changes can affect both band and cup size. Even small fluctuations might impact fit, which is why regular remeasuring is recommended.

What should I do if I have different sized breasts?

Fit for your larger breast and consider bras with removable padding or inserts to even out any asymmetry. This is completely normal and affects many women.

Ready to find your perfect fit? Use our calculator above to discover your ideal bra size across multiple international sizing systems. Remember that the perfect bra should feel comfortable, supportive, and confidence-boosting from the moment you put it on.