Bra Size Calculator
What is Bra Size?
Bra size is a standardized measurement that combines your band size (underbust) and cup size (bust difference) to help you find a well-fitting bra. It's commonly used worldwide to ensure comfort, support, and confidence for anyone who wears bras. Knowing your correct bra size is essential for health, posture, and daily comfort.
How to Use the How To Calculate Bra Size Calculator
- Type your underbust and bust measurements in centimeters or inches.
- Select your preferred unit (cm or in).
- Click Calculate to instantly see your recommended bra size in US/UK and EU systems.
- See your result and use it for shopping, fitting, or comparing brands.
The How To Calculate Bra Size Calculator is designed for quick, accurate, and easy bra size conversions. It's mobile-friendly and perfect for anyone looking to find their best fit at home.
How is Bra Size Calculated? (Formula Explained)
Bra size is calculated using your underbust and bust measurements. The process is:
Cup Size = Bust (in inches) - Band Size (in inches)
Band Size (EU) = Underbust (in cm) rounded up to nearest 5
Size = Band + Cup (e.g., 34C or 75C)
- Underbust: Measure around your ribcage, just under your bust.
- Bust: Measure around the fullest part of your bust.
- Unit: Choose centimeters or inches. The calculator converts as needed.
- Conversion: The calculator finds your band and cup size using official tables.
Example: Bra Size Calculation Step-by-Step
Let's say Maria measures her underbust at 75 cm and her bust at 90 cm:
- Input: Underbust = 75 cm, Bust = 90 cm, Unit = cm
- The calculator converts to inches, finds the nearest even band size (34), and calculates the cup size (C).
- Result: 34C (US/UK) / 75C (EU)
Maria can now shop for bras in both US/UK and EU sizes with confidence.
Why Bra Size Matters for You
- Comfort and preventing pain or discomfort
- Supporting breast health and posture
- Reducing the risk of skin irritation or marks
- Improving confidence and appearance
- Making shopping easier and more successful
Normal / Optimal / Average Bra Size Ranges
- US/UK Band Sizes: 28 – 44 (even numbers)
- EU Band Sizes: 60 – 110 (increments of 5)
- Cup Sizes: AA, A, B, C, D, DD, E, F, G, H, I, J, K
- Average US Size: 34DD
- Average EU Size: 75C
Benefits of Tracking Your Bra Size
- Shop confidently across global brands and websites
- Reduce the risk of buying the wrong size
- Track changes after weight loss, pregnancy, or aging
- Save time and money on returns and exchanges
- Ensure comfort and support for every day
Limitations of This Calculator
- Uses standard conversion tables; some brands may differ
- Does not account for breast shape, fullness, or width
- Results are estimates—always try bras on if possible
- Not for medical or surgical use
- Children's and teens' sizes may require special fitting
FAQs About the How To Calculate Bra Size Calculator
- Is bra size calculation accurate?
Standard tables are used, but fit can vary by brand and body shape. Always try on bras for best results. - What's the best bra size for women?
The best size is the one that fits your measurements and feels comfortable. The average US size is 34DD. - How often should I check my bra size?
Check yearly, or after weight changes, pregnancy, or surgery. - Can I use this for teens or children?
Yes, but growing bodies may need more frequent measurement and special styles. - How do I measure my underbust and bust?
Use a soft tape measure, keep it level, and measure under the bust and at the fullest part of the bust. - Does this work for all brands?
Most brands follow standard sizing, but always check brand-specific charts if available. - Can I convert between US/UK and EU sizes?
Yes, the calculator shows both systems for easy comparison. - Why do bra sizes differ by country?
Different regions use different measurement systems and standards.
How To Calculate Bra Size Calculator – Free Online Tool
The How To Calculate Bra Size Calculator is a free, accurate, and easy-to-use tool for women, teens, and anyone who wears bras. Instantly calculate your bra size in US/UK and EU systems. Use this tool to shop smarter and ensure the perfect fit every time.