🌸 Bra Size Calculator (US)

Measure your bra size in minutes. No signup. Private. Works instantly.

Inches CM

Underbust

Bust

Calculate your US bra size instantly using your bust and underbust measurements.

How to Measure Your Bra Size

Finding your bra size at home is easier than you might think. All you need is a soft measuring tape and two simple measurements.

Woman measuring her underbust with a tape measure to find her US bra size.

Step 1: Measure Underbust

Stand straight and wrap a measuring tape snugly around your rib cage, just beneath your bust. Make sure the tape is level all the way around.

Woman measuring the fullest part of her bust with a tape measure for bra size calculation.

Step 2: Measure Bust

Wrap the tape around the fullest part of your bust. Keep the tape parallel to the floor, relaxed, and flat against your body.

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Step 3: Enter Measurements

Enter your underbust and bust measurements into the calculator above. You'll instantly receive your Estimated US Bra Size.

US Bra Size Chart

Band	A	B	C	D	DD	DDD/F	G
30	30A	30B	30C	30D	30DD	30DDD	30G
32	32A	32B	32C	32D	32DD	32DDD	32G
34	34A	34B	34C	34D	34DD	34DDD	34G
36	36A	36B	36C	36D	36DD	36DDD	36G
38	38A	38B	38C	38D	38DD	38DDD	38G
40	40A	40B	40C	40D	40DD	40DDD	40G

Cup Size Chart

US bra size chart with simple illustrations showing A, B, C, D and DD cup sizes.

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A Cup: Small difference between bust and band.

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B Cup: Slightly fuller fit.

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C Cup: One of the most common cup sizes.

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D Cup: Full bust with additional support often preferred.

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DD Cup: Larger cup size with greater volume.

Popular Bra Sizes

32B Bra Size

Small to medium bust. Common petite size.

34B Bra Size

One of the most popular sizes. Balanced fit.

34C Bra Size

Fuller than 34B. Common US size.

36C Bra Size

Larger band with C cup volume. Comfortable everyday fit.

Double D (DD) Bra Size

More cup volume than D. Additional support often preferred.

Biggest Bra Size

There is no universal largest bra size. Custom manufacturers produce sizes beyond:

K L M N O P

Smallest Bra Size

Common small bra sizes include:

28AA 28A 30AA 30A

Depending on brand and country.

Frequently Asked Questions

How do I measure my bra size at home? +

Use a soft measuring tape to measure your underbust and bust. Enter these measurements into the calculator above to get an estimated US bra size.

Is this bra size calculator accurate? +

The calculator provides an estimate based on standard US sizing. Actual fit may vary slightly between brands and bra styles.

What does DD mean in bra sizes? +

DD is one cup size larger than D. It generally represents a fuller bust and is available in many band sizes, such as 32DD, 34DD, and 36DD.

Is 34B a common bra size? +

Yes. 34B is one of the most commonly available bra sizes in the United States and is offered by most lingerie brands.