Quick Answer

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

Finding your correct bra size can transform your comfort and confidence. Many women wear the wrong size without realizing it, leading to discomfort and poor support. Measuring at home is simple and takes just 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. This guide provides clear steps to measure your band and bust, calculate your cup size, and ensure a great fit.

What You'll Need

Before you start, gather a soft measuring tape, a mirror, and wear a non-padded bra or no bra for the most accurate measurements. If you don't have a tape measure, use a piece of string and a ruler.

Ensure the tape is level and snug but not tight. Take measurements in inches or centimeters, but be consistent. Write down your numbers as you go.

Measuring Your Band Size

Wrap the tape measure around your ribcage, directly under your bust. The tape should be horizontal and snug. Exhale and take the measurement in inches. Round to the nearest whole number. If the number is even, add 4 inches; if odd, add 5 inches. This is your band size. For example, if you measure 30 inches, your band size is 34.

Common mistake: Measuring too loosely. The tape should be snug but not digging in. Check that the tape is parallel to the floor all the way around.

Measuring Your Bust

Wrap the tape measure around the fullest part of your bust, keeping it level across your back. Ensure the tape is not too tight or too loose. Take this measurement in inches and round to the nearest whole number.

Common mistake: Measuring over a padded bra, which adds extra bulk. For accuracy, measure over bare skin or a non-padded bra.

Calculating Your Cup Size

Subtract your band size from your bust measurement. The difference determines your cup size: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, 5 inches = DD/E, and so on. For instance, if your band size is 34 and your bust is 37, the difference is 3, making you a C cup.

Remember, cup sizes are relative to band size. A 34C and 36C hold different volumes. Always check the fit with the specific bra style.

Using a Bra Size Calculator

Many online retailers offer bra size calculators that do the math for you. Input your measurements to get a recommended size. However, calculators are a starting point; different brands and styles may fit differently.

For example, Wacoal offers a range of bras with varying support and shaping features. Trying on different sizes and styles is the best way to ensure a perfect fit.

Checking the Fit

Once you have your size, try on a bra and check the fit: the band should be level and snug, the cups should contain all breast tissue without spillage or gaps, and the center gore should lie flat against your sternum.

Adjust the straps so they are comfortable and not digging in. Move around to ensure the bra stays in place. If the band rides up, go down a band size; if cups wrinkle, go down a cup size.

Step-by-Step Bra Sizing at Home

  1. Measure your band: Wrap the tape snugly under your bust, exhale, and note the measurement in inches. Round to the nearest whole number. Add 4 inches if even, 5 if odd to get your band size.
  2. Measure your bust: Wrap the tape around the fullest part of your bust, keeping it level. Round to the nearest whole number. Ensure the tape is not too tight or loose.
  3. Calculate cup size: Subtract band size from bust measurement. Each inch equals one cup size (1=A, 2=B, etc.). Use a bra size calculator to confirm.
  4. Try it on: Test bras in your calculated size, checking band snugness, cup coverage, and strap comfort. Adjust size if needed based on fit.

Wacoal Bras to Consider

  • Perfect Primer Full Figure Underwire Bra: Every detail in this full coverage underwire bra was designed for ultimate comfort. The Wacoal Perfect Primer Full Figure Underwire Bra offers dependable support and a smooth, seamless look for everyday wear. Full coverage underwire design provides reliable support and a rounded silhouette. Unlined and seamless construction helps create a smooth appearance under clothing. Back smoothing feature helps minimize lines for a sleek look. This bra is ideal for full-busted women seeking everyday support and a smooth silhouette. Its seamless construction is perfect under t-shirts and workwear.
  • Retro Chic Underwire T-Shirt Bra: Our smooth fitting Retro Chic Underwire is the perfect t-shirt bra for the full-busted women. This bra has a vintage look, with a touch of elegance and an ultra supportive design, which will make you look and feel amazing all day long. If you need a t-shirt bra that offers both style and support, this option combines a vintage aesthetic with modern comfort, ideal for all-day wear.

Measuring your bra size at home is a valuable skill that leads to better comfort and support. Remember that sizing can vary between brands, so always try on new styles. With these steps, you'll be well on your way to finding the perfect fit.