Bra Size Calculator | Accurate Bra Sizing Tool
Calculate your correct bra size with our accurate bra size calculator. Get perfect fit recommendations with international size conversion and fit troubleshooting.
The Bra Size Calculator is an essential tool that helps you accurately determine your correct bra size. Using standard international sizing methods, this calculator accounts for both band and cup measurements to find your perfect fit. No more guesswork or uncomfortable bras!
Why Accurate Bra Sizing Matters
Wearing the wrong bra size is more common than you think. Studies show that 70-80% of women wear incorrectly sized bras. An ill-fitting bra can cause discomfort, back pain, poor posture, and even affect how your clothes fit. Finding your correct size improves comfort, support, and confidence.
How Bra Sizing Works
Where:
Band Size = Underbust measurement (rounded to nearest even number)
Cup Size = Difference between bust and underbust measurements
Difference (inches) → Cup Size: A=1", B=2", C=3", D=4", DD/E=5", DDD/F=6", etc.
Key Features
- International Sizing: Convert between US, UK, EU, FR, AU, and JP bra sizes
- Measurement Guide: Step-by-step instructions for accurate measurements
- Size Comparison: See how your size translates across different brands
- Sister Sizes: Discover alternative sizes that might fit better
- Fit Troubleshooting: Solutions for common bra fit problems
- Brand Variations: Understand how sizing differs between popular brands
- Mobile Friendly: Works perfectly on all devices
Common Fit Problems & Solutions
Band Riding Up
The band should be parallel to the floor. If it rides up, try a smaller band size.
Cup Spillage
Breast tissue spilling over cups means you need a larger cup size.
Gaping Cups
Empty space in cups may mean wrong cup size or shape mismatch.
Straps Digging
Shoulder straps shouldn't bear all the weight. Tighten the band instead.
How to Measure Correctly
Measurement Instructions
- Underbust: Measure snugly around your ribcage, just under your breasts
- Bust: Measure loosely around the fullest part of your breasts
- Stand Straight: Stand naturally with arms at your sides
- Breathe Normally: Don't hold your breath or suck in your stomach
- Proper Tape: Use a soft measuring tape, not a metal one
- Wear a Bra: Wear your best-fitting non-padded bra or no bra
International Size Conversion
| US/UK | EU | FR | AU | JP | Band (cm) |
|---|---|---|---|---|---|
| 32A | 70A | 85A | 10A | 70A | 68-72 |
| 34C | 75C | 90C | 12C | 75C | 73-77 |
| 36DD | 80E | 95E | 14DD | 80E | 78-82 |
| 38F | 85F | 100F | 16F | 85F | 83-87 |
Bra Styles for Different Shapes
Full Coverage
- Best for full or heavy breasts
- Maximum support and coverage
- Ideal for everyday wear
- Great for reducing bounce
- Available in most sizes
Balconette
- Creates lift and cleavage
- Perfect under low-cut tops
- Best for average to full breasts
- Wider set straps
- Not ideal for very full breasts
Sister Sizes Explained
What Are Sister Sizes?
Sister sizes are bra sizes with the same cup volume but different band sizes. For example, 34C, 32D, and 36B are sister sizes. They can be useful when your usual size isn't available or if you're between sizes.
When to Use Sister Sizes
Go up a band size and down a cup size if bands feel tight. Go down a band size and up a cup size if bands feel loose. Remember: the cup letter changes when the band size changes!
Important Considerations
- Sizes vary between brands and styles
- Your size may change with weight fluctuations
- Different bra styles fit differently
- Measure every 6-12 months
- Try multiple sizes when possible
- Professional fittings are recommended
Frequently Asked Questions
How often should I measure myself?
Measure every 6-12 months or after significant weight changes (gain/loss of 5+ pounds), pregnancy, or surgery. Your bra size can change due to hormones, exercise, and aging.
Should I measure with or without a bra?
For most accurate results, wear your best-fitting non-padded bra or no bra at all. Avoid push-up or heavily padded bras as they can distort measurements.
Why do I get different sizes from different calculators?
Different calculators may use different sizing systems (US, UK, EU) or rounding methods. Brand variations also affect sizing. Use this as a starting point and try on bras when possible.
What if my measurements are between sizes?
Round your underbust to the nearest even number. If exactly between sizes, choose the larger band if you prefer comfort or the smaller if you prefer support. For cups, round up.
This bra size calculator provides estimated sizing based on standard measurement methods. Actual fit may vary by brand, style, and personal preference. For best results, try on bras in multiple sizes and consult with professional fitters when possible.