Find Your Perfect Bra Size Simple, Accurate Calculator

Bra Size Guide

Ready to find the perfect fit? Our easy-to-use calculator will guide you step by step.

Bra Size Guide

Calculate Bra Size

How to Take Bra Measurements

Preparation for Measurement

Measuring Tape IconMeasuring Tape Icon
Measuring Tape

Use a soft, flexible measuring tape.

Measurement Unit IconMeasurement Unit Icon
Measurement Unit

Choose inches or centimeters.

What to Wear IconWhat to Wear Icon
What to Wear

Wear a non-padded bra or no bra.

Mirror IconMirror Icon
Mirror (Optional)

To your measuring tape is level.

Things to consider
  • What to Wear: For the best results, wear a non-padded bra or a snug-fitting tank top. Avoid bulky or padded clothing.
  • When to Measure: Measure when your breasts are their most natural state, ideally a few days after your menstrual cycle ends to account for any size fluctuation.
  • Where to Measure: Find a comfortable, private space with a mirror. This helps ensure the measuring tape is level and correctly positioned.
  • Setting Up the Environment: Ensure the room is well-lit and you have a flat surface to stand on. Keep a notepad handy to jot down your measurements.

Step 1: Measure Your Band Size

Wrap the measuring tape snugly around your ribcage, directly under your bust. Make sure the tape is level and straight across your body.

Tip: If the measurement falls between two numbers, round it to the nearest whole number.

Band Measurement
Bust Measurement

Step 2: Measure Your Bust Size

Wrap the measuring tape around the fullest part of your bust. Ensure the tape is parallel to the ground and is not too tight or too loose.

Tip: Round the measurement to the nearest whole number if it falls between two values.

Step 3: Calculate Your Cup Size

Subtract your band size (Step 1) from your bust size (Step 2). The difference determines your cup size. Each inch difference typically corresponds to a cup size:

  • 1 inch difference = A cup
  • 2 inches difference = B cup
  • 3 inches difference = C cup, and so on.

Refer to the cup size chart below corresponding to your country's sizing standards

Cup Size Chart

Difference in (cm)UKUSEUFRAU
<1AAAAAAAAAA
1 (2.5)AAAAA
2 (5.1)BBBBB
3 (7.6)CCCCC
4 (10.2)DDDDD
5 (12.7)DDDD/EEEDD
6 (15.2)EDDD/FFFE
7 (17.8)FDDDD/GGGF
8 (20.3)FFHHHG
9 (22.9)GIIIH
10 (25.4)GGJJJI
11 (27.9)HKKKJ
12 (30.5)HHLLLK
13 (33.0)JMMML
14 (35.6)JJNNNM
15 (38.1)KOOON
16 (40.6)KKPPPO
17 (43.2)LQQQP
18 (45.7)MRRRLL

Step 4: Use our Bra Size Calcualtor

Start by using our online bra size calculator available on the left side of your screen. With your band and bust measurements in hand, enter these values into the calculator. Make sure to select your preferred measurement unit—either inches or centimeters. The calculator will analyze your measurements and provide you with the ideal bra size tailored to your body.

Self Calculation

If you prefer to manually calculate your bra size, simply combine the band size you measured earlier with the cup size obtained from the chart. For example, if your measured band size is 38 and you have determined a cup size of F from the chart, then your complete bra size would be 38F. This manual method allows you to double-check the calculator's accuracy and ensures a perfect fit.

Special Note on Traditional Calculation Methods

Some brands use a traditional calculation method to determine band size, which involves adding 4 inches to your actual underbust measurement. For instance, if your actual band measurement is 34 inches, these brands would calculate your band size as 38. This method can vary significantly from modern fitting practices, so it's essential to be aware of the sizing method used when selecting bras from different brands.

Step 5: Try on Bras for Fit

Once you have your calculated bra size, try on different bras in that size to check for comfort and support. Remember, bra sizing can vary slightly between different brands and styles.

Frequently Asked Questions

To find your correct bra size, you need two measurements:
  • Band Size: Measure around your ribcage, just under your bust. Make sure the tape is snug but not too tight.
  • Bust Size: Measure around the fullest part of your bust, making sure the tape is parallel to the floor and not too loose.
Once you input these measurements into the calculator, it will generate your bra size.

Yes! Our calculator allows you to switch between inches and centimeters. You can input your measurements in either unit, and the calculator will automatically convert them.

Our calculator is designed to be as accurate as possible by using standard sizing charts from various popular brands. However, your comfort and preference may vary depending on the style and fit of each brand. Use the results as a starting point and try different sizes if needed.

Bra sizes may vary between brands due to differences in their sizing systems. Our calculator provides brand-specific recommendations, helping you find the closest match for each brand.

Our bra size calculator supports a wide range of sizes, including smaller and plus sizes. We include band sizes from 27 in to 56 in (60 cm to 120 cm) and cup sizes from A to Z, covering most standard bra brands.

To ensure accurate results, the bust size dropdown adjusts based on your selected band size. This is because bust size is relative to band size, and this dynamic dropdown helps you pick the most appropriate range for your bust.

Our calculator includes sizing charts for popular brands such as Marks & Spencers, Victoria's Secret, Calvin Klein, and Chantelle. We continually update our list of brands to include more options, so you can expect a variety of choices.

Yes! The calculator provides sizing conversions for different regions, including US, UK, EU, FR, AU, and JP. Just input your measurements, and the calculator will convert your size based on the selected region.

Our calculator works for most bra types, including t-shirt bras, sports bras, balconette bras, and more. However, specialized bras like maternity or post-surgical bras may require additional considerations.

Currently, the calculator does not store personal data for privacy reasons. However, you can take a screenshot of your results or write them down for future reference.

Why Our Bra Size Calculator is the Best

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Most Accurate Measurements

Get the most precise bra size calculations based on your unique measurements.

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Brand-Specific Sizing

We consider brand-specific sizing to give you the best fit for each one.

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Style Recommendations

Take our 2-minute quiz and get bra styles tailored to your preferences.

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Bra Size Conversion

Convert your size easily across different brands with our conversion tool.

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Top Brand Recommendations

Discover the best brands offering bras suited for your size and shape.

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Personalized and Secure

Your data is safe with us, and we offer personalized recommendations to meet your needs.