Why Getting Your Bra Size Right Matters
Studies consistently show that a large proportion of women are wearing the wrong bra size. An ill-fitting bra doesn't just feel uncomfortable — it can contribute to back pain, poor posture, and even skin irritation. The good news? Measuring yourself accurately at home takes less than five minutes.
What You'll Need
- A soft fabric measuring tape (not a metal one)
- A well-fitting, non-padded bra (or no bra at all)
- A mirror, or a friend to help
- Pen and paper to note your measurements
Step 1: Measure Your Band Size
Wrap the measuring tape snugly around your ribcage, just underneath your bust. The tape should be level all the way around and parallel to the floor. Breathe normally — don't suck in or puff out.
- If your measurement is an even number, that is your band size.
- If your measurement is an odd number, round up to the next even number.
Example: If you measure 31 inches, your band size is 32.
Step 2: Measure Your Bust
With your arms relaxed at your sides, wrap the tape around the fullest part of your bust — usually across the nipple line. Keep the tape level and don't pull it too tight. Round to the nearest whole number.
Step 3: Calculate Your Cup Size
Subtract your band measurement from your bust measurement. The difference determines your cup size:
| Difference (inches) | Cup Size |
|---|---|
| Less than 1" | AA |
| 1" | A |
| 2" | B |
| 3" | C |
| 4" | D |
| 5" | DD / E |
| 6" | DDD / F |
Step 4: Do the Fit Check
Measurements are a starting point — always try on a bra to confirm the fit. Here's what a well-fitting bra should look and feel like:
- Band: Sits horizontally across your back without riding up. You should be able to slip two fingers underneath.
- Cups: Breast tissue sits fully inside the cup without spillage or gaps.
- Underwire: Lies flat against your ribcage, not on breast tissue.
- Straps: Stay in place without digging in — you should be able to slip one finger under each strap.
- Centre gore: The panel between the cups should lie flat against your sternum.
Understanding Sister Sizes
If a bra in your size doesn't feel quite right, try a sister size. Sister sizes share the same cup volume but differ in band size. Going up a band size means going down a cup letter, and vice versa.
Example: If 34C is too tight in the band, try 36B — the cup volume is the same.
When to Re-Measure
Your bra size can change with weight fluctuations, pregnancy, breastfeeding, hormonal shifts, and even changes in exercise habits. It's worth re-measuring every 6–12 months or any time your current bras start to feel uncomfortable.
Taking the time to find your true size is one of the simplest things you can do for everyday comfort and confidence.