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Bra Size Guide

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Bra Size Guide

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How To Measure Bra Size

Last updated: December 14, 2024

This guide will walk you through how to calculate your bra size using a bra size calculator in inches or centimeters.

Follow these steps to learn how to measure your bra size at home using just a soft measuring tape

Preparation for Bra Measurement

Before measuring your bra size, gather the following items for accurate results.

A soft measuring tape is a must, but having a mirror, a notepad to jot down measurements, and wearing a non-padded bra or snug tank top can make the process easier and more precise.

Measuring Tape IconMeasuring Tape Icon
Measuring Tape

Use a soft, flexible measuring tape.

Measurement Unit IconMeasurement Unit Icon
Measurement Unit

Choose inches or centimeters.

Measurement Unit IconMeasurement Unit 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 Before Bra Measurement

  • 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: How to Use a Cup Size Calculator

Now, subtract your band size (Step 1) from your bust size (Step 2) to find the difference. Each inch of difference corresponds to a specific cup size:

For example, if your band size is 34 inches and your bust size is 36 inches, the difference is 2 inches, making your bra a B cup size. Your full bra size would be 34B.

  • 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

Use our online bra size calculator in inches to quickly determine your size without manual calculations.

Step 4: Use our Bra Size Calculator

Start by using our online bra size calculator on the left side of your screen. Enter your band and bust measurements into the calculator.

Be sure to pick your preferred measurement unit, either inches or centimeters. The calculator will provide:

  • Your recommended bra size.
  • Two additional sister sizes to help you find the most comfortable fit across different brands and styles.
  • Recommended brands for the calculated size.
  • Style recommendations such as strapless bras, plunge bras, wireless bras, and push-up bras tailored to your size.

Self Calculation

If you'd rather calculate your bra size by hand, just combine the band size you measured with the cup size from the chart.

You can find a full bra size chart with sizes for different countries and brands at brasizecalculator.com/chart. The chart also includes a downloadable image for quick reference.

For example, if your band size is 38 and your cup size is F, then your full bra size would be 38F.

This method lets you double-check the calculator’s result for a better fit.

Special Note on Traditional Calculation Methods

Some brands use a traditional method to find band size, where they add 4 inches to your underbust measurement.

For example, if your band measurement is 34 inches, these brands would calculate your band size as 38.

This can be different from modern methods, so it’s helpful to know the sizing approach of each brand.

Step 5: Try on Bras for Fit

Once you have your calculated bra size, try on different bras in that size to see what feels comfortable and supportive.

Remember, sizing can vary between brands and styles, so try a few options to find your best fit.

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.

While many use tools like ‘a bra that fits calculator,’ our advanced bra size calculator goes a step further by incorporating brand-specific size charts. These charts are sourced directly from all major bra brands, ensuring a more accurate fit tailored to the specific sizing standards of each brand.

Brand-specific charts account for variations in sizing systems used by different brands. For example, a 34C in one brand might fit differently than the same size in another. By using brand-specific data, our calculator provides precise recommendations for each brand, helping you find a bra that truly fits.

Yes! Our calculator is designed to work with all major brands. Whether you prefer Victoria’s Secret, ThirdLove, or any other brand, our tool uses their official sizing charts to give you the most accurate size.

Absolutely. Our calculator includes charts from US, UK, EU, and other international sizing systems. You can easily convert your size to match the specific standards of your preferred brand or region.

Traditional methods often rely on generic calculations, which may not account for differences between brands. Our calculator combines band and cup measurements with brand-specific data to give you an exact size recommendation tailored to your preferred brand's fit.

No, you don’t need to know your current size. Simply measure your band and bust size as instructed, and our tool will calculate the most accurate size for your preferred brand, even if you’re unsure about your current fit.

Our bra size calculator provides results that are highly comparable to in-store fittings. With brand-specific charts and precise measurements, it minimizes errors and saves you the time and effort of visiting a store.

Yes, our calculator makes it easy to switch between brands. Once you input your measurements, you can see size recommendations for different brands instantly, ensuring you get the right fit no matter your preference.

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.