Bra Size Calculator

Bra Size Calculator

Calculate your bra size using accurate measurements. Includes international sizing and sister size recommendations for the perfect fit.

Measurement Methods

Your Measurements

Measure around ribcage, just under breasts

Measure around fullest part of bust

Measurement Tips

How to Measure

• Measure without a bra on
• Keep tape measure level and snug
• Take measurements in the morning
• Stand naturally, don't hold breath
• Measure in inches for best accuracy

Current Method

Standard Method
Traditional bra fitting method

About Bra Size Calculator

Our comprehensive bra size calculator helps individuals determine their accurate bra size using multiple measurement methods and international sizing standards. This essential fitting tool provides precise size calculations, sister size recommendations, and personalized fit guidance to ensure comfort and support for all body types.

What It Calculates

  • Band Size: Numerical band measurement (30-44+)
  • Cup Size: Letter cup measurement (AA-LL+)
  • International Sizing: US, UK, EU, and AU conversions
  • Sister Sizes: Alternative size options for better fit
  • Fit Analysis: Personalized fit notes and recommendations
  • Brand Guidance: Recommendations based on size range

Measurement Methods

Standard Method
  • Under bust measurement
  • Bust measurement at fullest point
  • Most accurate for most people
  • Industry standard approach
  • Good for all body types
  • Widely supported by brands
Alternative Methods
  • Modern fitting approaches
  • Body shape considerations
  • Comfort-focused sizing
  • Specialty brand methods
  • Professional fitting techniques
  • Custom sizing approaches

International Sizing Systems

US Sizing
  • Band sizes: 30-44+
  • Cup sizes: AA, A, B, C, D, DD, DDD, G, H, I, J
  • Most common in North America
  • Standard retail sizing
  • Easy to find in stores
  • Good starting point
UK Sizing
  • Band sizes: 28-46+
  • Cup sizes: AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH
  • More cup size options
  • Better for larger cup sizes
  • Professional fitting standard
  • Full-bust brand sizing

Understanding Your Results

Band Size

Numerical measurement

Cup Size

Letter measurement

Sister Sizes

Alternative options

How to Use

Measure your under bust (ribcage) and bust (fullest point) in inches. Choose your preferred measurement method, and the calculator will provide your bra size in multiple international standards along with sister sizes and personalized recommendations.

Measurement Techniques

Under Bust Measurement:

  • Measure around ribcage
  • Below breast tissue
  • Keep tape level and snug
  • Don't compress skin
  • Measure while standing
  • Exhale normally

Bust Measurement:

  • Measure at fullest point
  • Keep tape level
  • Don't compress breasts
  • Measure without a bra
  • Stand naturally
  • Consider natural movement

Sister Size System

  • Band Size Changes: Go up band, down cup (32D → 34C)
  • Cup Volume: Same cup volume, different band
  • Fit Adjustments: When standard size doesn't fit
  • Brand Variations: Different brands may fit differently
  • Comfort Options: Alternative sizes for comfort
  • Availability: More size options in stores

Size Range Considerations

Smaller Sizes
  • Band sizes 28-32
  • Cup sizes AA-B
  • Junior sizes available
  • Petite options
  • Bralettes work well
  • Wireless options
Larger Sizes
  • Band sizes 40+
  • Cup sizes F+
  • Plus-size brands
  • Full-bust specialists
  • Professional fitting
  • Custom options

Common Fitting Issues

  • Band Too Tight: Red marks, difficulty breathing
  • Band Too Loose: Riding up, no support
  • Cup Too Small: Spillage, quad boob
  • Cup Too Large: Gaping, wrinkling
  • Straps Falling: Band too loose, wrong size
  • Wire Issues: Wrong cup size or shape

Brand and Style Considerations

  • Brand Variations: Sizing can differ between brands
  • Style Differences: Balcony, plunge, full-cup fit differently
  • Material Impact: Stretch vs. non-stretch fabrics
  • Seasonal Changes: Body changes throughout the year
  • Age Considerations: Sizing needs change with age
  • Body Changes: Weight, pregnancy, hormones affect size

Professional Fitting

  • When to Get Fitted: Large cup sizes, unusual proportions
  • Professional Benefits: Expert measurement, multiple brands
  • Specialty Stores: Full-bust boutiques, lingerie specialists
  • Department Stores: Trained fitters, multiple options
  • Online Fitting: Virtual consultations, video calls
  • Regular Check-ups: Re-measure every 6-12 months

Shopping Tips

  • Try Multiple Sizes: Start with calculated size, adjust as needed
  • Brand Research: Read reviews, check size charts
  • Style Selection: Choose styles that work with your shape
  • Comfort Priority: Support should feel comfortable
  • Return Policies: Check return options before buying
  • Professional Help: Don't hesitate to ask for assistance

Body Shape Considerations

  • Full on Top: Balcony, demi-cup styles work well
  • Full on Bottom: Full-cup, plunge styles recommended
  • Even Distribution: Most styles work well
  • Wide Set: Side support, wider gore helpful
  • Close Set: Narrow gore, plunge styles better
  • Asymmetric: Adjustable straps, removable padding
Pro Tip

Remember that bra sizing is both a science and an art. While this calculator provides an excellent starting point, the perfect fit may require trying a few sizes and styles. Don't be discouraged if the calculated size doesn't feel right - bra fitting varies significantly between brands and styles. Also, consider that your bra size may change throughout your life due to weight fluctuations, pregnancy, aging, and other factors. Regular re-measuring ensures you always have the best fit for comfort and support.

About Bra Size Calculator

This comprehensive bra size calculator uses accurate measurement methods to determine your perfect bra size. It provides international sizing conversions, sister size recommendations, and fit guidance. The calculator supports both traditional and modern fitting approaches, making it suitable for various body types and preferences. Remember that bra fitting can vary between brands, so this serves as a starting point.