Struggling to find the right bra size? Our Bra Size Calculator makes it quick and easy to determine your accurate bra size based on your measurements. Just enter your band size (underbust) and bust size (full bust), and our tool will instantly calculate your correct cup size and band size.
Body Fat Percentage Calculator
Complete Bra Size Calculator
International Sizing • Fitting Guide • Expert Tips
Bra Size Calculator
Enter Your Measurements
International Conversions
Comprehensive Measurement Guide
Step-by-Step Instructions
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1
Prepare for measurement: Wear a well-fitted, non-padded bra or go braless
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2
Measure underbust: Wrap measuring tape around your ribcage, directly under your bust
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3
Measure bust: Measure around the fullest part of your bust, keeping tape parallel to floor
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4
Calculate size: Use our calculator to determine your perfect fit
Common Mistakes to Avoid
- Measuring over clothes or padded bras
- Pulling tape too tight or too loose
- Measuring at wrong time of menstrual cycle
- Not standing straight or hunching over
Best Time to Measure
Menstrual Cycle: Measure during the middle of your cycle (days 7-14) for most accurate results
Time of Day: Morning measurements are typically more consistent
Seasonal: Consider measuring seasonally as body weight can fluctuate
Professional vs. Self-Measurement
Professional
- • More accurate
- • Expert guidance
- • Fitting advice
Self-Measurement
- • More convenient
- • Private
- • Regular monitoring
Educational Content
Bra Anatomy Guide
Essential Components:
Additional Features:
Bra Types & Purposes
T-Shirt Bra
Seamless, smooth cups for everyday wear under fitted clothing
Push-Up Bra
Enhances cleavage and lift with padding or gel inserts
Balconette
Wide-set straps, horizontal cups, great for wide necklines
Sports Bra
Maximum support for physical activities and exercise
Bralette
Wireless, comfortable, fashion-forward option
Minimizer
Redistributes breast tissue to reduce apparent size
Plunge Bra
Deep V-neckline, perfect for low-cut tops
Full Coverage
Covers most of the breast for maximum support
Strapless
No straps, perfect for off-shoulder outfits
Breast Shape Guide
Round
Equally full at top and bottom
Recommended: T-shirt bras, balconette
East-West
Nipples point outward
Recommended: T-shirt bras, full coverage
Side Set
Wide gap between breasts
Recommended: Push-up, plunge
Close Set
Minimal gap between breasts
Recommended: Balconette, demi-cup
Bottom Heavy
Fuller at bottom than top
Recommended: Push-up, demi-cup
Top Heavy
Fuller at top than bottom
Recommended: Full coverage, minimizer
Athletic
Wider, muscular chest
Recommended: Push-up, padded bras
Asymmetrical
Different sizes
Recommended: Contour cups, padding
Sister Sizing Explained
What is Sister Sizing?
Sister sizes are different size combinations that have the same cup volume. When you go up a band size, you go down a cup size, and vice versa.
Example:
If you wear 34C, your sister sizes are:
- • 32D (smaller band, larger cup)
- • 36B (larger band, smaller cup)
When to Use Sister Sizes
- Band feels too tight → Go up band, down cup
- Band feels too loose → Go down band, up cup
- Your size is out of stock
- Different brands fit differently
Bra Fitting Myths Debunked
Myth: Add 4-5 inches to underbust measurement
Truth: This outdated method often leads to bands that are too large. Use your actual underbust measurement.
Myth: Bigger cup sizes are only for large breasts
Truth: Cup size is relative to band size. A 32F is much smaller than a 38F.
Myth: Bra size never changes
Truth: Size can change due to weight fluctuations, hormones, age, and pregnancy.
Myth: Expensive bras are always better
Truth: Price doesn’t guarantee fit. Focus on proper sizing and comfort.
Myth: Underwire bras are bad for you
Truth: Properly fitted underwire bras are safe and provide excellent support.
Interactive Tools
Bra Fit Checker Quiz
1. How does your band feel?
2. How do your cups fit?
Bra Lifespan Calculator
Bra Type Recommender
Fitting Guide & Troubleshooting
Signs of a Well-Fitted Bra
- Band lies flat against your back
- Center gore lies flat against sternum
- Cups fully contain breast tissue
- Straps stay in place without digging
- Underwire follows breast root
- Comfortable all-day wear
Seasonal & Age Considerations
Seasonal Changes
Weight fluctuations can affect bra size. Check fit seasonally.
Teens (13-18)
Frequent size changes during development. Check every 6 months.
Adults (18-40)
Size may change with weight, pregnancy, and hormones.
Mature (40+)
Breast shape changes may require different styles.
Common Problems & Solutions
Band rides up
Solution: Go down a band size, up a cup size
Cups overflow
Solution: Go up a cup size or try a different style
Cups gape
Solution: Go down a cup size or try a different shape
Straps dig in
Solution: Loosen straps or get a larger band size
Center gore doesn’t touch
Solution: Go up a cup size or try a different style
Underwire pokes
Solution: Try a different cup shape or larger size
When to Size Up or Down
Size Up When:
- • Breast tissue spills out
- • Band feels too tight
- • Underwire pokes
- • Red marks on skin
Size Down When:
- • Cups gape or wrinkle
- • Band rides up
- • Bra shifts during wear
- • Straps fall off
Care & Maintenance
Washing Instructions
Hand Washing (Recommended)
- 1. Use lukewarm water and gentle detergent
- 2. Soak for 15 minutes, gently agitate
- 3. Rinse thoroughly with cool water
- 4. Gently squeeze out excess water
- 5. Lay flat to dry
Machine Washing
- • Use lingerie bag or pillowcase
- • Cold water, delicate cycle
- • Mild detergent only
- • Never use fabric softener
Storage Tips
- Store cups nested, not folded
- Use drawer dividers or boxes
- Keep away from direct sunlight
- Avoid crushing or compressing
- Rotate between multiple bras
When to Replace
Replace When:
- • Band stretches out (6-12 months)
- • Underwire pokes through
- • Cups lose shape
- • Straps lose elasticity
- • Hooks or eyes break
Lifespan by Type:
- • Everyday bras: 6-8 months
- • Sports bras: 6-12 months
- • Special occasion: 2-3 years
- • Quality brands: 8-12 months
Extending Lifespan
- Own at least 3 bras to rotate
- Fasten hooks before washing
- Never twist or wring when wet
- Air dry only, never use dryer
- Put on properly (scoop and swoop)
Health & Comfort
Health Benefits of Proper Fit
- Reduces back and neck pain
- Improves posture and confidence
- Prevents skin irritation and chafing
- Enhances clothing fit and appearance
- Provides proper breast support
Pregnancy & Nursing
During Pregnancy
Expect 1-2 cup size increases. Choose wireless, stretchy styles for comfort.
Nursing Bras
Should provide easy access, good support, and accommodate size fluctuations.
Post-Weaning
Breast size may be different from pre-pregnancy. Re-measure after weaning.
Common Health Issues
Shoulder Pain
Often caused by straps carrying too much weight. Check band fit.
Back Pain
Usually from inadequate support. Consider full-coverage styles.
Skin Irritation
Check for proper fit and breathable fabrics.
Breathing Difficulties
Band may be too tight or style too compressive.
Sports Bra Selection
Low Impact (Yoga, Walking)
Compression or light encapsulation styles
Medium Impact (Cycling, Dancing)
Encapsulation with compression features
High Impact (Running, Jumping)
Maximum support encapsulation styles
Frequently Asked Questions
How often should I measure my bra size?
Why do sizes vary between brands?
Is it normal for breasts to be different sizes?
Should I size up during pregnancy?
How do I know if my sports bra fits correctly?
Can wearing the wrong bra size cause health problems?
What’s the difference between US and UK sizing?
How many bras should I own?
International Size Conversion Chart
| US Size | UK Size | EU Size | AU Size | FR Size | IT Size | JP Size |
|---|
Shopping Guide
Online Shopping Tips
- Read size charts carefully for each brand
- Check return policies before purchasing
- Read reviews from similar body types
- Order multiple sizes if unsure
- Note fabric composition for comfort
Price Ranges & Value
Budget ($15-30)
Basic everyday bras, good for trying new sizes
Mid-Range ($30-60)
Better quality, more styles, good durability
Premium ($60-120)
Designer brands, luxury materials, extended sizes
Luxury ($120+)
High-end materials, couture construction
Brand Sizing Notes
Victoria’s Secret
Runs small in band, limited cup range
Wacoal
True to size, excellent for larger cups
Freya
UK sizing, great for full bust
Panache
Firm bands, extensive size range
Third Love
Half-cup sizes, memory foam
Seasonal Shopping Tips
January-February
Post-holiday sales, clearance items
June-July
Mid-year sales, summer styles
Black Friday
Best deals of the year
End of Season
Clearance on seasonal colors