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

Quick Answer

To find your correct bra size at home, you'll need a soft measuring tape, a mirror, and about five minutes. Measure your band and bust, then calculate your size using a bra size calculator or chart. For the most accurate results, measure while wearing a non-padded bra and have someone help if possible.

Finding your correct bra size can feel like a mystery, but it's actually a simple process you can do at home. Many women wear the wrong size without realizing it—up to 80% according to some studies (though we don't have our own data). The good news is that with a few simple measurements, you can determine your band and cup size and finally get the support and comfort you deserve.

In this guide, we'll walk you through each step to measure bra size at home, explain how to use a bra size calculator, and share tips to ensure you fit a bra correctly. Whether you're shopping for a new everyday bra or a special occasion style, these steps will help you find your perfect match.

What You'll Need to Measure Your Bra Size

Before you start, gather a few essentials: a soft measuring tape (like the ones used for sewing), a mirror, and a non-padded bra (or go braless). It's also helpful to have a friend or partner to assist, as it ensures the tape is level and snug. If you're measuring alone, use a mirror to check the tape position.

Wear the bra that you typically wear (if any) that fits you best, but avoid padded or push-up styles as they can distort your natural shape. If you're between sizes, you might want to measure at different times of the month, as breast size can fluctuate with your cycle.

• Use a soft, flexible measuring tape—not a metal one.
• Measure in front of a mirror to ensure the tape is straight across your back.
• Keep the tape snug but not tight—you should be able to breathe comfortably.

Step 1: Measure Your Band Size

Your band size is the number around your ribcage, just under your bust. Wrap the measuring tape around your torso, making sure it sits level and parallel to the floor. It should be snug but not digging into your skin. Take a deep breath and note the measurement in inches. If the number is even, add 4 inches; if odd, add 5 inches. This gives you your band size. For example, if you measure 29 inches, your band size is 34.

Alternatively, you can use a bra size calculator that does the math for you. Many online calculators, including those on lingerie brand sites, ask for your underbust and bust measurements and then provide your size. This can be more accurate than manual calculation, as it accounts for different sizing systems.

• Ensure the tape is not too loose—you should not be able to pull it away from your body easily.
• If you're between band sizes, try the smaller band for firmer support, especially in brands known for stretchy bands.

Step 2: Measure Your Bust Size

Next, measure the fullest part of your bust. Wrap the tape around your back and across the fullest point of your chest, usually at nipple level. Keep the tape parallel to the floor and snug but not compressing. Note this measurement in inches. This is your bust size.

Your cup size is determined by the difference between your bust and band measurements. Each inch difference corresponds to a cup size: 1 inch = A, 2 inches = B, 3 inches = C, and so on. For example, if your band is 34 and your bust is 36, the 2-inch difference means you're a B cup, making your size 34B.

• Don't pull the tape too tight—this can make your cup size smaller than it actually is.
• If you have a larger bust, you might need to measure more than once to ensure accuracy.

Step 3: Calculate Your Bra Size

Now that you have your band and bust measurements, you can calculate your bra size. Use the difference method described above or plug your numbers into a bra size calculator. Many brands, including Curvy Kate, offer their own fitting guides and calculators to help you find the right size for their specific styles.

Keep in mind that bra sizes can vary between brands and even between styles within the same brand. For example, a plunge bra might fit differently than a full-cup style. Always refer to the brand's size chart and consider reading reviews from customers with similar measurements.

• Write down your measurements and the resulting size for future reference.
• If you're between sizes, consider buying two sizes to compare, as some styles run small or large.

Step 4: Try It On and Adjust

Once you have your calculated size, try on a bra in that size to see how it fits. A correctly fitting bra should have a band that sits level across your back and doesn't ride up. The center gore (the part between the cups) should lie flat against your sternum, and the cups should fully encase your breasts without spillage or gaps.

Adjust the straps so they are snug but not digging into your shoulders. The band should provide about 80% of the support, so if the straps are doing all the work, the band might be too loose. Move around, raise your arms, and bend over to ensure the bra stays in place.

• If the band rides up, try a smaller band size and a larger cup size to maintain volume.
• If the cups wrinkle or gap, try a smaller cup size or a different style.

Common Mistakes to Avoid When Measuring

One common mistake is measuring over a padded bra, which adds extra inches and leads to an incorrect size. Always measure over your bare bust or a non-padded bra. Another mistake is pulling the tape too tight, which can make your band size smaller than it should be and result in a too-tight fit.

Also, don't rely solely on the number you get from a calculator—different brands have different sizing. Always check the brand's specific size chart and consider ordering a couple of sizes to find your perfect fit. Remember that your bra size can change over time due to weight fluctuations, pregnancy, or aging, so it's a good idea to remeasure every six months or so.

• Don't measure over clothing—it adds bulk and skews results.
• Don't ignore the 'sister size' concept: if a bra doesn't fit perfectly, try a sister size (e.g., 34B is sister to 32C and 36A).

Step-by-Step: Measure Your Bra Size at Home

1. Measure your band: Wrap the tape around your ribcage, just under your bust. Ensure it's level and snug. Add 4 or 5 inches to get your band size. Checkpoint: The tape should be snug but not tight. If you can fit more than two fingers under it, it's too loose.
2. Measure your bust: Measure around the fullest part of your bust, keeping the tape parallel to the floor and snug but not compressing. Checkpoint: The tape should not be so tight that it flattens your breasts. You should be able to breathe normally.
3. Calculate your size: Subtract your band size from your bust measurement. Each inch equals one cup size (1 inch = A, 2 = B, etc.). Use a bra size calculator for confirmation. Checkpoint: If your measurements are between sizes, consider sizing up in the band for comfort or down for firmer support.
4. Try it on and adjust: Put on a bra in your calculated size. Check that the band is level, the center gore lies flat, and the cups contain your breasts fully. Checkpoint: If the band rides up, go down a band size and up a cup size. If cups gap, try a smaller cup or different style.

Curvy Kate Bras Designed for a Perfect Fit

• Curvy Kate Spotlight Full Cup Side Support Bra Black: With a four-part cup which uses side panels to give forward projection, and laminated cups for lift and support, it's a wardrobe must have. This bra is ideal for everyday wear, offering full coverage and side support that helps keep breast tissue forward, reducing spillage and enhancing shape—great if you've discovered you need a fuller cup style.
• Curvy Kate WonderFull Vibe Full Cup Side Support Bra Black: The wide, firm wing mesh smooths and supports whilst the anchored back straps banish strap slippage, finished with a curved underband to reduce rolling and discomfort. If you struggle with straps slipping or bands digging in, this bra's technical features ensure a secure, comfortable fit, making it a smart choice after you've measured your size accurately.
• Curvy Kate Luxe Strapless Multiway Bra Cocoa: Gravity defying strapless bra with vertical cup seams and silicone grip on underband for non-slip fit. Once you know your correct size, a strapless option like this offers reliable support without straps, thanks to its silicone grip and underwired, foam-lined cups—perfect for special occasions.

Finding your correct bra size at home is a straightforward process that can dramatically improve your comfort and confidence. By following these steps and using a bra size calculator, you'll be well on your way to a perfect fit. Remember to remeasure periodically and always check brand-specific size charts, as sizes can vary. With the right measurements, you can confidently shop for bras that offer the support and style you need.