What is it
The Bra Size Calculator is a free, professional-grade online tool designed to help anyone determine their ideal bra size quickly and accurately. By entering simple band measurements (around the ribcage) and bust measurements (around the fullest part of the chest), users receive instant results that convert seamlessly between imperial (inches) and metric (centimeters). No registration or personal data is required, and international sizing references (US, UK, EU, AU, and more) are provided to ensure global compatibility. The calculator uses proven sizing algorithms to compute both band size and cup size, and it includes a clear, visual size reference to verify results manually.
Key features
- Accurate two-step sizing: Input band measurement and bust measurement; the tool instantly outputs your ideal bra size.
- Universal measurement support: Automatically converts between inches and centimeters, suitable for users worldwide.
- Comprehensive size reference: Detailed cup size charts and a difference-to-cup size table to help users understand and verify results.
- International sizing compatibility: Displays results in multiple standards (US, UK, EU, AU, etc.) for global shopping confidence.
- Visual size guide: Easy-to-read charts that show conversion differences to cup sizes for quick manual verification.
- Mobile-friendly design: Fully responsive interface that works well on phones, tablets, and desktops.
- Privacy-first approach: No data storage or account creation required; measurements stay private and are not saved.
- Free to use: No fees, subscriptions, or registrations needed, making it accessible to everyone.
How to use
- Step 1: Measure your band size
- Wrap a measuring tape snugly around your ribcage directly under your bust.
- Ensure the tape is parallel to the floor and not too tight; round to the nearest whole number.
- Step 2: Measure your bust size
- Measure around the fullest part of your chest, keeping the tape level all the way around.
- Step 3: Calculate
- Enter both measurements into the Bra Size Calculator.
- The tool outputs your recommended size, with automatic conversions across imperial and metric units and international sizing standards.
- Optional verification
- Use the visual size guide to cross-check the difference between bust and band measurements and verify the suggested cup size.
- Pricing
- The tool is completely free with no registration required.
- Optional paid features are not indicated; the core calculator remains a free resource.
Use cases and benefits
- Shopping confidently: Find the correct bra size before purchasing to minimize returns and exchanges.
- Time and cost efficiency: Quickly determine size without trying on multiple bras or visiting stores.
- Consistent sizing reference: Use universal measurement standards to compare sizes across brands and regions.
- Comfort and health: Improve everyday comfort by selecting sizes that better support the bust, reducing underband irritation and ill-fitting cups.
- Brand variation navigation: The tool accounts for common sizing differences between brands, suggesting closest fits and sister sizes when needed.
- Privacy assurance: Users can obtain accurate measurements without sharing personal data or creating accounts.
- Fitness and lifestyle relevance: Useful during pregnancy, weight changes, or athletic training when bust size may shift.
Target audience
- Anyone seeking accurate bra sizing, including:
- Individuals shopping online who want reliable sizing across brands and regions.
- Newbra buyers who need a quick reference before committing to a purchase.
- People experiencing changes in bust size due to weight fluctuation, pregnancy, or hormonal shifts.
- Men or non-traditional customers seeking size guidance for gender-inclusive or wearable chest support garments using the same measurement principles.
- Sports enthusiasts looking for a baseline size for sports bras or specialty bras, acknowledging potential brand-specific adjustments.
Tips for best results
- Measure on a non-padded, well-fitting bra for the most accurate bust measurement.
- Ensure the measuring tape is level and parallel around the body when taking both band and bust measurements.
- If your measurements fall between standard sizes, consider sister sizes or rounding to the nearest size based on comfort and brand fit.
- Re-measure every 6–12 months or after significant changes (weight, pregnancy, or hormonal changes) to maintain an up-to-date size.
- Use the international size charts provided by the calculator to understand cross-brand sizing differences and verify results manually.
Frequently Asked Questions
- How do I measure my band size accurately?
- Measure around your ribcage directly under your bust with a snug but not tight tape. Round to the nearest whole number.
- What’s the difference between band and bust measurements?
- Band size is measured under the bust around the ribcage; bust size is measured around the fullest part of the chest. The difference typically determines your cup size.
- Can I use this calculator if I’m between sizes?
- Yes. The calculator will suggest the closest size, and you can test sister sizes for better comfort.
- How often should I recalculate my bra size?
- Reassess every 6–12 months or after notable changes like weight shifts, pregnancy, or hormonal changes.
- Why do different brands fit differently even with the same size?
- Sizing variations exist across brands; the calculator provides a starting point, but adjustments by one size up or down may be necessary.
- Is this calculator accurate for all body types?
- It works well for most body types using standard sizing principles, but personal fit preferences and body shapes may require trying different styles.
- Can I use it without wearing a bra?
- Best accuracy is achieved with a well-fitting, non-padded bra; if not available, measure consistently without a bra and adjust expectations.
- Does this work for sports or specialty bras?
- It provides a standard sizing baseline; certain specialized bras may use different sizing conventions.
- Can men use this calculator?
- Yes, the same band and bust measurement principles apply for accurate results, regardless of gender.
Note: The tool emphasizes privacy, ease of use, and international applicability, making it a practical resource for anyone seeking accurate bra sizing quickly and confidently.