Bra Size Calculator - Find Your Perfect Bra Size
Enter your measurements below to find your perfect bra size. For accurate results, use a soft measuring tape.
List of the Top 10 Best Bras:
How to Measure Your Bra Size at Home?
Measuring Instructions
- Underbust Measurement:
- Measure directly under your breasts
- Keep the tape parallel to the ground
- Take a snug measurement
- Bust Measurement:
- Measure around the fullest part of your breasts
- Keep the tape loose enough to breathe
- Wear an unpadded bra for best results
Complete Bra Measuring Guide
Before You Start
- Wear an unpadded bra or no bra for most accurate measurements
- Use a soft measuring tape (not a metal construction tape)
- Stand in front of a mirror if possible
- Keep the measuring tape parallel to the ground
- Take measurements while standing straight with arms relaxed
Step-by-Step Measuring Guide
1. Measuring Your Band Size (Underbust)
Instructions:
- Wrap the measuring tape around your ribcage, directly under your breasts
- Keep the tape snug but not tight - you should be able to breathe comfortably
- Make sure the tape is parallel to the ground
- Round to the nearest whole number
Tips:
- Take a deep breath and exhale before measuring
- The tape should be firm but not digging into your skin
- This measurement determines your band size
2. Measuring Your Bust Size
Instructions:
- Wrap the measuring tape around your chest at the fullest part of your breasts
- Keep the tape loose enough to slide one finger underneath
- Ensure the tape is straight across your back
- Look in a mirror to check the tape position
Tips:
- Don't pull the tape too tight
- Keep your arms relaxed at your sides
- Make sure breasts are not compressed
Common Measuring Mistakes to Avoid
| Mistake | Why It's Wrong | How to Fix It |
|---|---|---|
| Measuring over clothes | Adds extra inches | Measure over bare skin or thin bra |
| Tape not parallel | Creates inaccurate measurement | Check in mirror or have someone help |
| Measuring too tight | Results in uncomfortable fit | Keep tape snug but not digging in |
| Measuring while bent | Distorts natural shape | Stand straight with good posture |
Understanding Bra Size Variations
1. Bra Size Variations by Country
| US Size | UK Size | EU Size | FR/BE/ES Size |
|---|---|---|---|
| 32A | 32A | 70A | 85A |
| 34B | 34B | 75B | 90B |
| 36C | 36C | 80C | 95C |
| 38D | 38D | 85D | 100D |
2. Brand Size Variations
Bra sizes can vary between brands due to:
- Different sizing standards
- Variations in materials and construction
- Style differences
- Target demographic variations
Signs of a Good Fit
Band Fit
- Stays parallel to the ground
- Snug but comfortable fit
- Can fit two fingers under the band
- Doesn't ride up in back
Cup Fit
- Breasts fully contained in cups
- No spillage over the top or sides
- No gaping or wrinkling in cups
- Underwire sits flat against ribcage
Center Gore
- Lies flat against sternum
- Separates breasts properly
- Doesn't pull away from body
Straps
- Stay in place without digging
- Don't slip off shoulders
- Can fit one finger under comfortably
When to Remeasure?
You should remeasure your bra size if:
- You've gained or lost weight
- You're experiencing hormonal changes
- You're pregnant or breastfeeding
- It's been 6-12 months since your last measurement
- Your current bras don't fit comfortably
- You've had breast surgery
- You've started or changed exercise routines
Bra Size Chart
This chart helps you determine your cup size based on the difference between your bust and underbust measurements:
| Band Size (Underbust) | Difference (Bust - Underbust) | Cup Size | Example Size |
|---|---|---|---|
| Round to nearest even number | 1" | A | 32A, 34A, 36A |
| Round to nearest even number | 2" | B | 32B, 34B, 36B |
| Round to nearest even number | 3" | C | 32C, 34C, 36C |
| Round to nearest even number | 4" | D | 32D, 34D, 36D |
| Round to nearest even number | 5" | DD/E | 32DD, 34DD, 36DD |
| Round to nearest even number | 6" | DDD/F | 32F, 34F, 36F |
To use this chart:
- Measure your underbust and bust size as instructed above.
- Calculate the difference between your bust and underbust measurements.
- Find your band size by rounding your underbust measurement to the nearest even number.
- Match the difference to the cup size in the chart.
Common Bra Sizing Issues
| Issue | Possible Cause | Solution |
|---|---|---|
| Band rides up | Band too large | Try smaller band size |
| Overflow at top | Cup too small | Go up a cup size |
| Gapping in cups | Cup too large | Try smaller cup size |
Frequently Asked Questions When Finding Your Perfect Bra Size
How do I know if my bra fits correctly?
A well-fitting bra should be snug but comfortable, with the band parallel to the ground and cups that fully contain breast tissue without spillage or gaps. The center gore should lay flat against your sternum.
What are sister sizes?
Sister sizes are bras that have the same cup volume but different band sizes. For example, 34C, 32D, and 36B are sister sizes. These can be helpful when fine-tuning your fit.
How often should I measure my bra size?
It's recommended to measure every 6-12 months, or when you experience significant weight changes, pregnancy, or other body changes that might affect your size.
Why do I get different sizes in different brands?
Sizing can vary between brands and styles. Use our calculator as a starting point, then try sister sizes to find your perfect fit in each brand.
Should the band be tight?
The band should be snug but not uncomfortable. It provides 80% of your bra's support, so it needs to be firm enough to stay in place without riding up or causing discomfort.