Finding the right bra size can feel confusing, but it doesn’t have to be! Wearing a bra that fits properly can make you feel more comfortable, supported, and confident no matter your shape or age. Whether you’re a teen buying your first bra or simply wondering if your size has changed, you can measure yourself at home in just a few minutes.
This guide will walk you through the process step-by-step, with clear instructions and tips to make sure your measurements are accurate.
What You’ll Need
- A soft measuring tape (the flexible kind used for sewing)
- A mirror (optional, but helpful to check tape placement)
- A pen and paper (to jot down measurements)
- A well-fitting non-padded bra or sports bra (for accuracy)
Step 1: Measure Your Band Size (Underbust)
- Stand up straight and relax your arms at your sides.
- Wrap the measuring tape snugly around your ribcage, just under your bust.
- Make sure the tape is parallel to the ground and not twisted.
- Take the measurement in inches and round to the nearest whole number.
Example: If your underbust measures 31 inches, round it to 31. If it’s an odd number, you can try both the rounded-up and rounded-down band sizes (e.g., 30 and 32) to see which feels better.
Step 2: Measure Your Bust Size (Fullest Part of the Chest)
- Keep the tape around your back, but now bring it up to the fullest part of your bust (usually across the nipples).
- Keep the tape comfortably against your body—not too tight and not too loose.
- Breathe normally and relax your shoulders.
- Record the number in inches, rounding to the nearest whole number.
Example: If your bust measures 35 inches, write down 35.
Step 3: Calculate Your Cup Size
Cup size is determined by subtracting your band measurement from your bust measurement.
Bust Measurement – Band Measurement = Difference
Then, use the chart below to find your cup size:
| Difference (in inches) | Cup Size |
|---|---|
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD/E |
| 6 | DDD/F |
| 7 | G |
Example:
Band: 31 inches
Bust: 35 inches
35 – 31 = 4-inch difference → Cup Size: D
Your size: 31D (you may also try 32C if you prefer a looser band).
Step 4: Double-Check the Fit
Even with the right measurements, sizing can vary between brands. When you try on a bra:
- The band should be snug but not painful—it provides most of the support.
- Cups should fully contain your breasts without gaping or spillage.
- Straps should sit comfortably on your shoulders without digging in.
- The center front of the bra should lie flat against your chest.
Tips for Accurate Measurements
- Wear a non-padded bra so you’re measuring your natural shape.
- Stand straight but relaxed—don’t pull your shoulders forward or back unnaturally.
- Take measurements twice to ensure consistency.
- Measure in front of a mirror to check that the tape is level.
- Re-measure every 6–12 months or after weight changes, pregnancy, or growth spurts.
Body-Positive Reminder
Your bra size is just a number and a letter—it’s not a reflection of your worth, beauty, or femininity. Every body is unique, and the best size for you is the one that feels comfortable, supports you well, and makes you feel good in your own skin.