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. Measure your band size by wrapping the tape snugly around your ribcage, just under your bust. Then measure your bust size at the fullest part. Subtract the band measurement from the bust measurement to find your cup size. Use a bra size calculator or chart to confirm.

Finding the right bra size can feel like a guessing game, but it doesn't have to be. Many women wear the wrong size without realizing it, leading to discomfort, poor support, and even back pain. Measuring at home is simple and takes only a few minutes with a soft tape measure.

Whether you're shopping online or in-store, knowing your measurements helps you choose bras that fit well and feel great. This guide walks you through each step, highlights common mistakes, and offers tips for getting the most accurate results. With a little practice, you'll be able to find your correct bra size with confidence.

Why Accurate Measurements Matter

Wearing the wrong bra size can cause a host of problems: straps digging into your shoulders, bands riding up, cups gaping or spilling, and even back and neck pain. A well-fitted bra distributes weight evenly, provides proper support, and enhances your silhouette under clothing.

Your bra size can change due to weight fluctuations, hormonal changes, exercise, or aging. That's why it's a good idea to measure yourself every six months or whenever a bra starts to feel off. Taking accurate measurements at home ensures you order the right size whether you're buying a new everyday bra or a special occasion piece.

• Measure with a soft, flexible tape measure—not a metal one.
• Wear a non-padded bra or no bra for the most accurate bust measurement.
• Have a friend help if possible to ensure the tape stays level.

Step 1: Measure Your Band Size

Wrap the measuring tape around your ribcage, directly under your bust. The tape should be snug but not tight, and it should sit parallel to the floor. Take a deep breath and exhale to get a relaxed measurement. Round to the nearest whole number.

If the measurement is even, add 4 inches; if it's odd, add 5 inches. This sum is your band size. For example, if you measure 29 inches, your band size is 34. If you measure 30 inches, your band size is 34 as well. This method aligns with standard sizing charts.

• Common mistake: pulling the tape too tight, which gives a smaller band size than needed.
• Checkpoint: The tape should be level all the way around your body.

Step 2: Measure Your Bust Size

Wrap the tape around the fullest part of your bust, keeping it parallel to the floor. Make sure the tape is not too tight—it should rest comfortably without compressing your breasts. Round to the nearest whole number.

This measurement represents your bust size. It's essential to measure at the nipple line for consistency. If you have a larger bust, you might find it helpful to lean forward slightly to ensure you're measuring all breast tissue.

• Common mistake: measuring over a padded bra or clothing, which adds bulk and skews results.
• Checkpoint: The tape should lie flat without digging into your skin.

Step 3: Calculate Your Cup Size

Subtract your band size from your bust measurement. The difference in inches corresponds to your cup size: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, 5 inches = DD/E, and so on. For example, if your band is 34 and your bust is 37, the 3-inch difference means you're a C cup.

Your full bra size is the band size plus the cup letter, such as 34C. Keep in mind that cup sizes can vary slightly between brands and styles, so always check the specific brand's size chart when ordering.

• Common mistake: using the bust measurement alone to determine cup size without subtracting the band.
• Checkpoint: If the difference is an odd number, round up to the next cup size for a more comfortable fit.

Step 4: Use a Bra Size Calculator for Confirmation

Once you have your band and bust measurements, plug them into an online bra size calculator or refer to a sizing chart. Many brands, including Felina, offer calculators that account for variations in sizing. Inputting your numbers ensures you get a size that aligns with their specific fit.

Remember that your calculated size is a starting point. Different bra styles—such as minimizer bras, bralettes, or sports bras—may fit differently. For instance, a bralette might be sized S/M/L rather than traditional bra sizes. Always read product descriptions and reviews to understand how a style runs.

• Common mistake: ignoring brand-specific size charts and assuming all brands fit the same.
• Checkpoint: Use your measurements to compare across brands until you find your go-to size.

Step 5: Fine-Tune the Fit with a Try-On

When your bra arrives, try it on and assess the fit. The band should sit level across your back and feel snug on the loosest hook. You should be able to slide two fingers under the band. The center gore (the piece between the cups) should lie flat against your sternum. Cups should fully encase your breasts without spillage or gaps.

Adjust the straps so they're comfortable and don't slip, but remember that straps should do only about 10-20% of the work; the band provides most of the support. Move around—raise your arms, bend, and twist—to ensure the bra stays in place.

• Common mistake: judging fit by the cup letter alone; the band is equally important.
• Checkpoint: If the band rides up in the back, it's too big; if the cups wrinkle, they're too big; if the underwire digs, the cup may be too small.

Step-by-Step Checklist for Accurate Bra Measurement

1. Prepare the right tools: Get a soft measuring tape, wear a non-padded bra or no bra, and stand in front of a mirror. Ensure the tape is not stretched or twisted.
2. Measure band and bust: Wrap the tape under your bust for band size and around the fullest part for bust size. Keep the tape level and snug but not tight. Round to the nearest whole number for both measurements.
3. Calculate and confirm: Subtract band from bust to find cup size, then use a bra size calculator to confirm your final size. Check the brand's size chart before ordering.
4. Try on and adjust: When your bra arrives, try it on and check the band, cups, and straps. Make adjustments as needed. If it doesn't fit perfectly, consider sister sizing or trying a different style.

Bras That Fit Well and Feel Great

• Amaranth Unlined Minimizer Bra: Designed to reduce bust projection by up to 1 inch, this full-coverage bra gently redistributes breast tissue for a balanced, flattering fit under clothing. If you're between sizes or prefer a streamlined look, this minimizer can help you feel confident and comfortable.
• Organic Cotton Stretch Bralette: Made from GOTS-certified organic cotton and dyed with plant-based colors, it’s a kinder choice for you and the planet — breathable, flexible, and beautifully soft for all-day wear. For lounging or casual days, a bralette in S/M/L sizing offers easy comfort without the constraints of underwire.
• Super Soft Modal Bralette: Made from ultra-smooth modal fabric, this bandeau-style bralette delivers an unmatched silky feel against the skin — perfect for lounging, casual wear, or layering under your favorite tee. If you prefer wire-free options, this bralette provides a soft, flexible fit that adapts to your body.

Measuring your bra size at home is a simple process that can save you from discomfort and the hassle of returns. With these steps, you'll be able to find your correct bra size and shop with confidence. Remember to re-measure periodically and always consult brand-specific size charts for the best fit.