How to Figure Out Your Bust Size? A Step-by-Step Guide
How to Figure Out Your Bust Size: A Step-by-Step Guide to the Perfect Fit
When it comes to finding a bra that truly fits, understanding your bust size is the most important step—and the one most women get wrong. Whether you're shopping for everyday support, a strapless bra, or something more fashion-forward, knowing your true bust measurement is essential for comfort, shape, and confidence.
At Olivia Paisley Intimates, we believe that every woman deserves a personalized fit. In this guide, we’ll show you how to accurately figure out your bust size from the comfort of home, with just a few simple tools.
What Is Bust Size?
Your bust size refers to the measurement around the fullest part of your chest. This number—combined with your band size—helps determine your correct bra cup size.
So while your bra size might be something like 36C, the bust size is specifically the part of that equation that reflects breast volume.
What You’ll Need
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A soft measuring tape
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A mirror (to check tape placement)
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A non-padded bra or no bra at all (for best accuracy)
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A notepad or your phone to record measurements
Step 1: Measure Your Band Size
Your band size is the measurement around your ribcage, just under your breasts.
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Stand upright and wrap the measuring tape around your ribcage, just beneath your bust.
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Keep the tape level and snug, but not tight.
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Round to the nearest whole number.
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If the number is even, add 4. If odd, add 5.
Example: 31" under bust + 5 = 36 band size
Step 2: Measure Your Bust Size
Now measure the fullest part of your chest—usually across the nipples.
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Wrap the measuring tape gently around your chest at its fullest point.
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Keep the tape straight across your back and not too tight.
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Take the measurement and round to the nearest whole number.
Example: Bust = 39"
Step 3: Calculate Your Cup Size
Now subtract the band size from the bust measurement:
Bust (39") – Band (36") = 3"
Each inch of difference equals a cup size:
| Difference (in inches) | Cup Size |
|---|---|
| 1 | A |
| 2 | B |
| 3 | C |
| 4 | D |
| 5 | DD/E |
| 6 | DDD/F |
| 7 | G |
Final bra size: 36C
Signs You Might Be Wearing the Wrong Size
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Gaping or spillage in the cups
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Straps slipping off or digging in
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Bra rides up in the back
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Underwire poking or sitting too far from the breast tissue
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Constant adjusting throughout the day
If any of these sound familiar, it’s time to remeasure—and possibly try a new style.
Pro Tip: Recheck Your Size Regularly
Your body changes over time. Weight fluctuations, hormonal shifts, pregnancy, and aging can all impact your bust size. We recommend measuring:
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Every 6–12 months
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After significant weight loss or gain
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During and after pregnancy
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When bras start to feel uncomfortable or unsupportive
Prefer a Professional Fitting?
While measuring at home is a great start, nothing beats an expert bra fitting. At Olivia Paisley Intimates, our fit specialists are trained to help women find their perfect fit across a wide range of band and cup sizes—including specialty sizes for fuller busts, petites, and plus sizes.
Whether you're shopping for your first well-fitting bra or updating your entire lingerie drawer, we’re here to help you look and feel your best.
Final Thoughts: Confidence Starts With the Right Fit
Understanding how to figure out your bust size is the foundation of comfortable, supportive lingerie. No matter your shape or size, the right fit changes everything—from posture to confidence to how your clothes feel.
✨ Visit Olivia Paisley Intimates in-store or online to explore bra styles designed for your perfect fit.
