Bra Size Calculator

Underbust (cm)

Overbust (cm)

Finding the perfect bra size can be tricky, but with our Bra Size Calculator, you can easily determine your correct size with just a few simple measurements. Wearing the right bra size is essential for comfort, support, and confidence. In this article, we'll walk you through how to use our calculator, explain how bra sizes are determined, and answer common questions to help you understand your bra size better.

How to Use the Bra Size Calculator

The Bra Size Calculator helps you calculate your bra size by measuring two areas: your underbust and overbust. You can choose to input these measurements in centimeters or inches using the toggle button on the calculator. Once you've entered your measurements, the calculator will automatically provide you with your band size and cup size.

Follow these simple steps to calculate your bra size:

Measure Your Underbust:
- Using a measuring tape, wrap it around your ribcage directly under your breasts. Ensure the tape is snug but not too tight. This is your underbust measurement.
Measure Your Overbust:
- Wrap the tape around the fullest part of your breasts (usually at the nipple level) while keeping it level across your back. This is your overbust measurement.
Input the Measurements:
- Enter these measurements into the Bra Size Calculator, select the unit (cm or inches), and hit "Calculate."
View Your Result:
- The calculator will provide you with your correct bra size, including both the band size and the cup size.

Example of How Bra Size is Calculated

Measurement	How It’s Used
Underbust	Determines your band size. A snug measurement is rounded and adjusted to create your final band size.
Overbust	Determines your cup size. The difference between the underbust and overbust measurements is used to calculate the cup size.

Bra Size Calculation Formula

Band Size: If your underbust measurement (in inches) is an odd number, the calculator adds 5 inches. If it’s an even number, the calculator adds 4 inches. This adjustment helps account for the stretchiness of most bras.
Cup Size: The difference between the overbust and band size determines the cup size. For example:
- 1-inch difference = Cup size A
- 2-inch difference = Cup size B
- 3-inch difference = Cup size C
- And so on.

Common Bra Size Calculation Example:

Underbust Measurement: 31 inches (Odd number, so 31 + 5 = Band Size 36)
Overbust Measurement: 38 inches (Difference: 38 - 36 = 2 inches, which equals Cup Size B)
Final Bra Size: 36B

Frequently Asked Questions (FAQ)

What is the most accurate way to measure my bra size?

Use a soft measuring tape to measure around your ribcage directly under your bust for the band size and around the fullest part of your bust for the overbust measurement. Ensure the tape is level across your back.

How often should I measure my bra size?

Your body can change due to weight fluctuations, hormonal changes, pregnancy, or lifestyle shifts. It’s recommended to measure your bra size every 6 months to a year.

What if my measurements fall between two sizes?

If you're between two band sizes, it’s best to size down in the band and up in the cup to ensure a snug fit. For example, if you're between a 34 and 36 band, try a 34C instead of a 36B.

Why does my bra size feel uncomfortable even after calculating it?

Comfort depends on the bra’s style, material, and fit. Not all bras are made the same, so even with the correct size, you may need to try different styles to find what’s most comfortable for your body shape.

Is there a difference between UK and US bra sizes?

Yes, bra sizes can vary slightly between countries. The cup sizes remain the same, but the band sizes might differ. Our calculator follows the standard sizing used in most countries, but always check the sizing guide when shopping internationally.

What does a sister size mean?

Sister sizes are alternative bra sizes where the cup volume is the same, but the band size differs. For example, if your bra size is 34C, a sister size would be 36B (larger band, smaller cup) or 32D (smaller band, larger cup).

Band Size (Inches)	Overbust Size (Inches)	Difference (Inches)	Cup Size
32	33	1	A
34	36	2	B
36	38	2	B
38	41	3	C
40	42	2	B

Bra Size Measurement Table for Indian Body Types

Band Size	Underbust (in inches)	Overbust: Cup A (in inches)	Overbust: Cup B (in inches)	Overbust: Cup C (in inches)	Overbust: Cup D (in inches)	Overbust: Cup E (in inches)	Overbust: Cup F (in inches)
28	23-24	28-29	29-30	30-31	31-32	32-33	33-34
30	25-26	30-31	31-32	32-33	33-34	34-35	35-36
32	27-28	32-33	33-34	34-35	35-36	36-37	37-38
34	29-30	34-35	35-36	36-37	37-38	38-39	39-40
36	31-32	36-37	37-38	38-39	39-40	40-41	41-42
38	33-34	38-39	39-40	40-41	41-42	42-43	43-44
40	35-36	40-41	41-42	42-43	43-44	44-45	45-46
42	37-38	42-43	43-44	44-45	45-46	46-47	47-48
44	39-40	44-45	45-46	46-47	47-48	48-49	49-50

How to Use This Table

Measure your Underbust: Wrap the measuring tape around your ribcage, right under your breasts. Ensure the tape is snug but not too tight.
Measure your Overbust: Place the measuring tape at the fullest part of your bust.
Find Your Size: Refer to the table above to determine your band size based on your underbust measurement and your cup size based on how your overbust measurement matches with the provided ranges.

This table is useful for women to find the correct bra size that fits properly, ensuring comfort and support tailored to their body shape.

Understanding the Differences:

The difference between the underbust and overbust determines the cup size:
- 1-inch difference = Cup A
- 2-inch difference = Cup B
- 3-inch difference = Cup C
- 4-inch difference = Cup D
- 5-inch difference = Cup DD
- 6-inch difference = Cup E
- 7-inch difference = Cup F
- 8-inch difference = Cup G

By using this table and the Bra Size Calculator, you can easily determine your accurate bra size based on your measurements. If your measurements don't fit perfectly into one size, consider trying a sister size that has a similar cup volume but a different band size for a better fit.

Final Thoughts on Bra Size Calculation

Finding the right bra size is crucial for both comfort and support. Ill-fitting bras can lead to discomfort and health issues such as back pain and poor posture. By using our Bra Size Calculator, you can take the guesswork out of finding your perfect fit. Regularly updating your measurements will ensure you always have bras that fit properly and make you feel confident.

If you have any further questions, don't hesitate to reach out to a professional fitter or contact our support team for guidance.

Feel free to bookmark this page and revisit whenever you need to check your bra size!