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Bra Size Calculator

Measurement System

Your Measurements

Measure snugly around your ribcage, just under your bust

Measure around the fullest part of your bust

Sizing System

How to Measure

• Wear a non-padded bra

• Keep tape parallel to ground

• Measure while standing

• Breathe normally

Sister Sizes

If one size doesn't fit, try the sister sizes shown in results

Note: This calculator provides an estimate. For best results, try on bras and adjust as needed.

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What is online Bra Size Calculator?

The Bra Size Calculator is a free, easy-to-use online tool that helps you determine your correct bra size based on your body measurements. By entering your band measurement (under bust) and bust measurement (over bust), the calculator instantly provides your accurate bra size according to your preferred sizing system.

This comprehensive tool supports both inches and centimeters, making it accessible to users worldwide. It calculates your band size and cup size while also providing sister sizes – alternative sizes with the same cup volume but different band measurements. The calculator supports 12 international sizing systems including US, UK, EU, Italy, Australia, Japan, South Korea, Brazil, China, India, Mexico, and Argentina, ensuring you get the right size no matter where you shop.

How to use Bra Size Calculator?

Using the Bra Size Calculator is simple and takes just a few steps:

Step 1: Choose your preferred measurement system (inches or centimeters) by clicking the appropriate button at the top.

Step 2: Measure your band size by wrapping a measuring tape snugly around your ribcage, just under your bust. Enter this measurement in the "Band Size" field.

Step 3: Measure your bust size by wrapping the tape around the fullest part of your bust while wearing a non-padded bra. Enter this measurement in the "Bust Size" field.

Step 4: Select your region from the "Sizing System" dropdown menu to get results in your local sizing format.

Step 5: Click the "Calculate My Size" button to instantly see your bra size, along with sister sizes and fitting tips.

The calculator displays your complete bra size, breaks down your band and cup measurements separately, and shows three sister sizes to help you find the perfect fit.

Use Cases for Bra Size Calculator

The Bra Size Calculator is perfect for various situations:

Online Shopping: Determine your correct size before purchasing bras online from international retailers to avoid returns and exchanges.

Post-Weight Change: Recalculate your size after weight gain, weight loss, pregnancy, or postpartum recovery when your body measurements have changed.

International Travel: Convert your size when shopping in different countries or buying from foreign brands with different sizing standards.

First-Time Measurement: Young adults and teenagers can use this tool to find their proper bra size when shopping independently for the first time.

Brand Switching: Calculate your size when trying a new lingerie brand, as sizing can vary significantly between manufacturers.

Gift Buying: Help partners or family members determine the correct bra size when purchasing intimate apparel as a gift.

Frequently Asked Questions

Have questions about Bra Size Calculator? Find answers to the most common queries below.

The calculator provides a reliable estimate based on standard sizing formulas used by the lingerie industry. However, since brands may vary in their sizing, we recommend trying on bras to confirm the fit. The calculator is most accurate when measurements are taken correctly.
Sister sizes are bra sizes with the same cup volume but different band sizes. For example, 34D, 32DD, and 36C are sister sizes. If your calculated size doesn't fit perfectly, trying sister sizes can help you find a more comfortable band while maintaining the same cup volume.
Choose whichever unit you're most comfortable with. The calculator automatically converts between units, so your results will be accurate regardless of which measurement system you select. Most measuring tapes show both units.
While band sizes are generally the same, cup sizes can differ. UK sizing uses DD instead of E, and the progression differs at larger cup sizes. Always check which sizing system a brand uses before purchasing.
The band provides the majority of breast support in a properly fitted bra. Measuring under your bust, where the band sits, ensures you get a band size that provides adequate support without being too tight or loose.
Recalculate your size whenever you experience significant weight changes (±10 pounds), after pregnancy and nursing, or if your current bras feel uncomfortable. Many women also find their size changes with age due to natural body changes.
If your measurements are between sizes, try both sizes along with their sister sizes. The calculator rounds to the nearest standard size, but comfort is personal. Some prefer a tighter band with a larger cup, while others prefer the opposite.
For most accurate results, wear a non-padded, well-fitting bra when taking measurements. Sports bras compress breast tissue, which can lead to inaccurate measurements and incorrect size calculations.