How to Measure Your Bra Size at Home: A Step-by-Step Guide

Quick Answer

To measure your bra size at home, you'll need a soft measuring tape and a mirror. Take two measurements: your band size (just under your bust) and your bust size (at the fullest part). Then, subtract the band size from the bust size to determine your cup size. For the most accurate result, measure in a well-fitting non-padded bra and have someone help if possible.

Finding the right bra size can feel like a mystery, but measuring at home is simpler than you think. A well-fitting bra not only looks better but also provides essential support and comfort throughout the day. Whether you're shopping for a new everyday bra or a special occasion piece, knowing your measurements is the first step.

In this guide, we'll walk you through a straightforward process to measure your bra size at home. We'll also share common mistakes to avoid and tips for ensuring accuracy, so you can shop with confidence—whether online at Aubade® or in a boutique.

What You'll Need

Before you start, gather the essentials: a soft measuring tape (the flexible kind used for sewing), a mirror, and a well-fitting non-padded bra. Wear the bra you typically wear, as it helps position your breasts naturally. If you don't have a soft tape, you can use a piece of string and a ruler, but a tape is easiest.

Measure in front of a mirror to ensure the tape is straight and level. It's also helpful to have a friend or partner assist for the most accurate results, especially for the back measurement. If you're measuring alone, take your time and double-check each measurement.

• Use a soft measuring tape for flexibility.
• Wear a non-padded bra for accurate bust measurement.
• Stand straight with arms relaxed at your sides.

Step 1: Measure Your Band Size

Wrap the measuring tape snugly around your ribcage, just under your bust. The tape should be parallel to the floor and snug but not tight. Take a deep breath and exhale; the tape should feel comfortable, not restrictive. Note the measurement in inches, rounding to the nearest whole number.

If the measurement is an even number, that's your band size. If it's odd, add 4 inches to get an even number. For example, if you measure 29 inches, your band size is 33. This extra room ensures the band fits comfortably without digging in.

• Ensure the tape is level all the way around your back.
• Don't pull the tape too tight—you should be able to slip a finger underneath.

Step 2: Measure Your Bust Size

Wrap the tape around the fullest part of your bust, typically at nipple level. Keep the tape parallel to the floor and snug but not compressing your breasts. Make sure the tape isn't dipping in the back or too loose in the front. Note this measurement in inches, rounding to the nearest whole number.

For the most accurate bust measurement, avoid wearing a heavily padded bra. A non-padded or lightly lined bra, like the Rosessence Comfort bralette, allows your breasts to sit naturally, giving you a true reading.

• Look straight ahead in the mirror to check the tape's levelness.
• Do not hold your breath or puff out your chest.

Step 3: Calculate Your Cup Size

Subtract your band size from your bust size. The difference in inches corresponds to your cup size: 0-1 inch is an A cup, 2 inches is a B cup, 3 inches is a C cup, and so on. For example, if your band size is 34 and your bust size is 37, the difference is 3 inches, making you a C cup.

Keep in mind that cup sizes are not static across band sizes. A 34C has a different volume than a 36C. This is why it's crucial to get both measurements right. If you're between sizes, try the sister size (e.g., if 34C feels tight, try 36B) for a better fit.

• Use a bra size calculator for a quick check, but manual measurement is reliable.
• Remember that different brands may fit slightly differently, so always try on when possible.

Common Mistakes to Avoid

One common mistake is measuring over a padded bra, which adds extra inches and leads to an incorrect cup size. Another is pulling the band tape too tight, resulting in a band size that's too small. Always measure on bare skin or with a thin, non-padded bra for accuracy.

Also, avoid measuring after a workout or at different times of the month when breast size can fluctuate. For the most consistent results, measure in the morning and on a day when you feel 'normal'. If you're between sizes, it's often better to size up in the band and down in the cup for comfort.

• Don't measure over bulky clothing.
• Re-measure every six months or after significant weight changes.

Step-by-Step Measurement Checklist

1. Wear a non-padded bra: Put on a comfortable, non-padded bra to ensure your breasts are in their natural position. This prevents overestimation of your bust size.
2. Measure band size: Wrap the tape snugly under your bust, ensuring it's level. Round to the nearest whole number, and add 4 inches if odd. The band should feel snug but not tight.
3. Measure bust size: Wrap the tape around the fullest part of your bust, keeping it parallel to the floor. Avoid pulling the tape tight to get an accurate reading.
4. Calculate cup size: Subtract band size from bust size. Use the difference to find your cup letter. If between sizes, try sister sizes for the best fit.

Products That Support Your Fit

• Rosessence Comfort bralette Nude d’Été: The Rosessence non-underwired triangle comfort bralette features elegant floral lace that extends from the shoulders to the waist in a modern bustier style that provides excellent support. When measuring, wearing a non-underwired bralette like this allows your breasts to sit naturally, giving you accurate measurements for a comfortable fit.
• My Desire Triangle: The Elie Saab x Aubade ultra plunge triangle bra combines intricate embroidery with dashes of shimmering lurex, gold details between the cups and a back made from very modern, lightweight matt fabric. If you prefer a plunge style, knowing your exact size ensures the ultra-plunge neckline sits correctly and provides the coverage you expect.

Now that you know how to measure your bra size at home, you're ready to shop with confidence. Remember, the perfect fit is key to comfort and support. Explore Aubade's collection, from supportive bras to elegant bralettes, and find your ideal match. When in doubt, our fit experts are here to help.