Let’s face it…figuring out your bra size can feel like decoding a secret map. Between band sizes, cup sizes, and that ever-elusive perfect fit, it’s no wonder so many of us end up in bras that pinch, gape, or just don’t make us feel our best. But fear not! Learning how to measure bra size and cup size is easier than you think—and dare I say, kind of fun?

Grab a measuring tape, your favourite non-padded bra, and let’s uncover the magic of how to calculate bra size like a pro.
Step 1: Measure Your Band Size
The first step to finding your perfect fit is figuring out the base of it all: your band size. Here’s how to measure bust size for the band:
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Stand in front of a mirror for accuracy.
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Wrap the measuring tape snugly around your ribcage, just under your bust. Keep it parallel to the floor.
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Take note of the number in inches. If it’s an odd number, round up to the nearest even number.
This number is your band size, the foundation of how to figure out bra size.
Pro Tip: If the tape feels like it’s squeezing, it’s too tight! Comfort is key.
Step 2: Measure Your Bust Size
Next, it’s time to measure the fullest part of your bust—where the magic happens. Wondering how to check bra size for the cup? Here’s how:
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Keep the tape loose but level.
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Wrap it around the fullest part of your chest, usually at nipple level.
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Record the number in inches.
This is your bust size, and it’s essential for figuring out how to measure cup size.
Step 3: Do the Math (Don’t Worry, It’s Easy)
Here’s where we calculate how to determine cup size from measurements. Subtract your band size (Step 1) from your bust size (Step 2). The difference in inches corresponds to your cup size.
Difference (inches) |
Cup Size |
Less than 1 |
AA |
1 |
A |
2 |
B |
3 |
C |
4 |
D |
5 |
DD or E |
For example, if your band size is 34 and your bust size is 37, the difference is 3 inches. That makes you a 34C! Voilà, you’ve cracked how to calculate bra cup size.
Step 4: Check the Fit
Now that you’ve nailed how to figure out bra size, let’s make sure it fits. A properly fitting bra should:
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Have a snug but comfortable band (no riding up the back).
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Offer full coverage without spillage or gaping in the cups.
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Keep straps secure without digging into your shoulders.
If something feels off, double-check how to measure brassiere size or try a different style.
Quick Answers to The Burning Bra-Sizing Questions
Q: How do you know your bra size is correct?
A: The band should lie flat against your ribcage, cups should fit snugly without gaps, and the straps shouldn’t slip.
Q: How do I measure bra size at home?
A: Grab a measuring tape and follow the steps above for band and bust measurements—it’s that simple!
Q: How to check bra size if you’re between sizes?
A: Try the sister size! If a 34C feels snug, go for a 36B or a 32D.
Finding Your Dream Fit
Now that you know how to measure bra size and cup size, the world of perfectly fitting bras is yours to explore. Whether you’re hunting for how to find your bra cup size or just wondering how to check the bra cup size you already have, the key is knowing your numbers—and trusting your instincts.
So, go forth and conquer the bra aisle with confidence. Because when your bra fits like a dream, you’ll feel unstoppable.
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