Bra Size Calculator
Calculate your perfect bra size with international conversions - US/UK/EU/JP sizing chart for the best fit
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About Bra Size Calculator
The Bra Size Calculator is a professional bra sizing tool that automatically calculates your cup size based on underbust and bust measurements. It provides international size conversions for US, UK, EU, JP, FR, and AU sizing systems. Whether you're shopping online, traveling abroad, or buying for others, you can easily find the correct bra size.
This tool supports both centimeter and inch measurements, provides sister size recommendations, and includes detailed measurement guides and shopping tips to help you shop for bras with confidence and find the most comfortable fit.
How to Use the Bra Size Calculator
Using the Bra Size Calculator is simple. Just follow these steps:
- Select your measurement unit (centimeters or inches)
- Measure underbust: Use a soft tape around your ribcage just below your breasts (snug but not tight)
- Measure bust: Measure around the fullest part of your bust (usually at nipple level)
- Enter measurements into the calculator
- The system automatically calculates band size and cup size
- View international size conversions (US/UK/EU/JP/FR/AU)
- Check sister size recommendations for the most comfortable fit
- Use "Share" to share results with friends, or "Export PDF" to save records
Features
- Quick Calculation: Just enter two measurements for complete size information
- International Conversions: Supports US, UK, EU, JP, FR, AU sizing standards
- Dual Units: Choose between centimeters (cm) or inches (in)
- Sister Sizes: Provides alternative sizes with same cup volume but different bands
- Measurement Guide: Detailed instructions for measuring underbust and bust
- Complete Size Chart: Full international bra size conversion table
- Shopping Tips: 6 helpful tips for finding the perfect bra fit
- Real-time Calculation: Instant display of all corresponding sizes
- Data Persistence: Automatically saves your inputs for convenience
- Share Function: Share calculation results via URL
- PDF Export: Export results as PDF report
- Bilingual Support: Switch between Traditional Chinese and English
Frequently Asked Questions
Q1: How do I measure underbust and bust correctly?
Measure in the morning before your body swells. Use a soft measuring tape and wear a thin, non-padded bra or no bra. Underbust: Measure around your ribcage just below your breasts, keeping the tape level and snug but not tight. Bust: Measure around the fullest part of your bust (usually at nipple level) while breathing normally. Take 2-3 measurements and use the average for accuracy.
Q2: What are sister sizes?
Sister sizes are bra sizes with the same cup volume but different band sizes. For example, if you wear 34C, sister sizes include 32D (tighter band, larger cup) and 36B (looser band, smaller cup). Sister sizes are excellent alternatives when your exact size isn't available.
Q3: What size should I choose for online shopping?
Use this tool's calculation results and check the product page's size chart and customer reviews. Sizes may vary between brands. If it's your first time buying that brand, consider ordering sister sizes for comparison. For new bras, start with the loosest hook and adjust as needed over time.
Q4: How do I know if my bra size fits correctly?
A well-fitting bra should: (1) lie flat against your skin without wrinkles or bulges; (2) have straps that provide support without slipping or digging in; (3) have a band that stays level without riding up or leaving deep marks; (4) have cups without overflow or gaps; (5) have a center gore that lies flat against your sternum. If uncomfortable, adjust size or try sister sizes.
Q5: How do bra sizes differ between countries?
Sizing systems vary: US and UK use numbers + letters (e.g., 34C); Europe (EU) uses larger numbers (e.g., 75C); Japan (JP) is similar to Taiwan (e.g., 75C); France (FR) typically adds 15 to the band (e.g., 90C). While cup letters are the same, actual sizes may vary slightly. This tool makes international conversions easy.
