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Bra Size Calculator
Find Your Bra Size
Calculate band and cup size from measurements
Convert Bra Sizes
Convert between sizing standards
Find Alternative Sizes
Find compatible alternative sizes
Bra Size Results
How to Use the Bra Size Calculator
Finding Your Bra Size
Measure your underbust (band measurement) and bust circumference. The calculator will determine your band size and cup size based on these measurements. Select your preferred bra style for adjusted recommendations.
Understanding Measurements
- Band Measurement (Underbust): Measure directly under your bust with a soft measuring tape, keeping it snug but not tight
- Bust Measurement: Measure around the fullest part of your bust
- Cup Difference: The difference between bust and band measurements determines your cup size
Size Conversion
Different countries use different sizing standards. Use the conversion tool to find your size in other countries' standards. For example, a US 32C is a UK 32C, EU 70C, and AU 10C.
Finding Alternatives
Sometimes your exact size isn't available. The calculator helps find compatible alternative sizes that will fit similarly. For example, a 34C can be substituted with a 32D or 36B depending on fit preferences.
Complete Bra Sizing Guide
Understanding Band Sizes
Band sizes are determined by underbust measurement. Each band size corresponds to a 2-inch (5cm) difference.
Band Size Chart (cm to Size)
| Underbust (cm) | Underbust (inches) | US Size | EU Size | UK Size |
|---|---|---|---|---|
| 63-67 | 25-26.5 | 28 | 60 | 28 |
| 68-72 | 27-28.5 | 30 | 65 | 30 |
| 73-77 | 29-30.5 | 32 | 70 | 32 |
| 78-82 | 31-32.5 | 34 | 75 | 34 |
| 83-87 | 33-34.5 | 36 | 80 | 36 |
| 88-92 | 35-36.5 | 38 | 85 | 38 |
| 93-97 | 37-38.5 | 40 | 90 | 40 |
Understanding Cup Sizes
Cup sizes are determined by the difference between bust and band measurements. Each cup size represents approximately 2 cm (0.75 inches) of difference.
Cup Size Chart
| Cup Difference | Cup Size | Difference (inches) | Example (36 Band) |
|---|---|---|---|
| 0 cm | A | 0 | 36A |
| 2 cm | B | 0.75 | 36B |
| 4 cm | C | 1.5 | 36C |
| 6 cm | D | 2.25 | 36D |
| 8 cm | DD/E | 3 | 36DD |
| 10 cm | F | 3.75 | 36F |
Common Bra Size Categories
- Small Bust (A, B): Less fullness, petite builds
- Average Bust (C, D): Most common sizes, standard proportions
- Full Bust (DD, E, F): More fullness, larger proportions
- Very Full Bust (G+): Extra full, specialized sizing
Size Equivalents
Many people find they can wear different sizes due to band stretch and different cup volumes. Some common equivalents include:
- 34C = 32D = 36B
- 36C = 34D = 38B
- 38D = 36DD = 40C
Band Fit Guidelines
- Band Too Tight: Can't fit one finger under the band, red marks on skin
- Band Too Loose: Rides up in the back, gaps in the cup, band below band level
- Perfect Fit: Band sits level around body, you can fit one finger comfortably under
Cup Fit Guidelines
- Cup Too Small: Spillage at sides or top, gaps where breasts don't fill cup
- Cup Too Large: Excess fabric, wrinkles in the cup, slipping during movement
- Perfect Fit: Breasts completely fill the cup without spillage
Bra Fitting Tips & Best Practices
Measuring Tips
- Measure Without Bra: Wear no bra or an unpadded bra for accurate measurements
- Use Proper Tape: Use a soft measuring tape, not a ruler
- Measure Parallel to Ground: Keep tape parallel to the ground, not angled
- Take Multiple Measurements: Measure multiple times to ensure consistency
- Measure at Same Time of Day: Breast size varies throughout the day
Trying On Guidelines
- Try Multiple Sizes: Always try on in the calculated size and adjacent sizes
- Fasten on Loosest Hook: New bras should fasten on the loosest hook
- Adjust Straps: Straps should be snug but not cutting into shoulders
- Check Underwire: Underwire should sit in the breast crease
- Move Around: Walk, bend, and raise arms to test comfort and fit
When to Replace Bras
- After 6-9 Months: Regular bras lose elasticity after regular wear
- When Elastic Stretches: Elastic becomes loose, band rides up
- When Underwire Breaks: Can cause discomfort and poke through fabric
- After Weight Changes: Significant weight gain or loss requires size reassessment
- When Straps Break: Broken straps affect fit and support
Care Tips to Extend Bra Life
- Hand Wash: Hand washing extends bra life longer than machine washing
- Use Delicate Cycle: If machine washing, use delicate cycle in a mesh bag
- Air Dry: Avoid dryer; air dry to preserve elastic
- Rotate Bras: Alternate between multiple bras to extend life
- Avoid Tight Storage: Store bras loosely to prevent deformation
Frequently Asked Questions
Can my bra size change?
Yes, bra size can change due to weight gain/loss, pregnancy, hormonal changes, and age. It's recommended to get measured every 1-2 years.
What if my measurements fall between sizes?
If you measure between sizes, try both and see which fits better. Some people prefer tighter bands with smaller cups, others prefer looser bands with larger cups.
Why do bra sizes vary between brands?
Different brands use different sizing standards. One brand's 34C might fit like another brand's 34B. Always try before buying when possible.
What's the difference between cup sizes?
Each cup size represents approximately 2 cm (0.75 inches) of difference. A 34C has 4 cm more in the bust than a 34A.
Can I wear multiple sizes?
Yes, many people can wear different equivalent sizes (e.g., 34C = 32D). The total cup volume is similar even though band and cup sizes differ.
Should my band be tight or loose?
Your band should be snug enough that you can fit one finger under it comfortably. It should not ride up in the back or slip while moving.
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