What Is an Underbust?
Your underbust refers to the circumference of your ribcage just below your bust, where the bra band sits properly. This measurement plays a crucial role in determining the bra’s band size – for example, 32,34,36, etc.How to Measure Underband (Underbust) Accurately
- Use a soft measuring tape.
- Stand straight and breathe normally.
- Place the tape right under your bust, snugly around your ribcage.
- Note the measurement in inches.
Why It Matters
Your underbust measurement determines your bra’s foundational support. A loose band means your bust isn’t getting enough lift, putting pressure on your shoulders. On the other hand, a too-tight band restricts breathing and irritates your skin.What Is Overbust?
Your overbust refers to the measurement taken across the fullest part of your bust, that is usually across the nipples. This measurement helps determine your cup size(A, B, C, D, etc.)How to Measure Overbust Accurately
- Wear a non-padded, well-fitting bra (or go braless if comfortable).
- Wrap the measuring tape around your fullest bust area, usually across the nipples.
- Stand upright, keeping your arms relaxed at your sides.
- The tape should be level and not tight.
- Record the measurement in inches.
What Is the Difference Between Underbust and Overbust?
The difference between overbust and underbust is the formula used to determine your cup size. Here’s a quick reference: Difference (in inches) Cup Size| Inches | Cup Size |
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD/E |
| 6 | F |
Understanding Cup Size with Overbust & Underbust Difference
Let’s take this a step further and understand how the full bra size is calculated: Measure Underbust: Suppose you get 31 inches. Round it to the nearest even number → 32 (band size). Measure Overbust: You measure 35 inches. Cup Calculation: 35 (overbust) – 32 (band) = 3 inches → Cup size C. Your correct bra size = 32C. If you are still confused about finding the right size of your bra, then this bra size calculator helps you find the correct fit.Common Mistakes to Avoid While Measuring
Despite the accurate measurements, many women still face ill-fitting bras. Here’s why:
1. Measuring over Clothes
Wearing clothes while measuring gives you inaccurate measurements. Always measure directly over the skin or a fitted non-padded bra. This gives you the exact measurement that will help you find your size.2. Wearing a Padded or Push-up Bra
A padded or push-up bra gives extra volume to your bust and avoids your natural shape for measuring. So it is better to avoid them.3.The Tape Is Too Loose or Too Tight
The measuring tape should sit snugly but comfortably. If it is too tight, you’ll end up choosing a smaller size. If it is too loose, the result is a larger size than you need.4. Not Updating Your Size Regularly
Our bodies change due to age, hormones, weight fluctuations, and even posture. Shyaway recommends re-measuring every 6–12 months to ensure you’re wearing the right size.Final Thoughts
Understanding what is underbust and what is overbust may seem small, but it has a big impact on your daily life. A perfect bra size improves comfort, confidence, and posture. Measuring accurately and understanding these terms can help you avoid years of discomfort from ill-fitting bras. FAQ’S- Can my bra size change over time?
- How often should I measure my underbust and overbust?
- What if my overbust and underbust don’t match a chart?