My Bra Size Calculator

Finding the right bra size is one of the most common struggles many people face. Wearing the wrong size can lead to discomfort, poor posture, and even long-term health issues. That’s why we created the Bra Size Calculator — a simple, accurate, and free tool that helps you determine your perfect bra size in seconds.

My Bra Size Calculator

How to Use the Bra Size Calculator (Step by Step)

Using the calculator is very straightforward. Here’s how you can get your results:

  1. Measure your underbust
    • Wrap a measuring tape snugly around your ribcage, just under your bust.
    • Enter the value (in inches) into the “Underbust” field.
  2. Measure your overbust
    • Wrap the measuring tape around the fullest part of your bust.
    • Enter this number into the “Overbust” field.
  3. Click “Calculate”
    • The calculator will automatically add 4 inches to your underbust measurement to determine the band size.
    • It will then calculate the difference between your overbust and band size to determine your cup size.
  4. See your results
    • Your final bra size will appear in the results box along with the cup difference.
  5. Reset if needed
    • Use the Reset button to clear the fields and try again.

Example: Finding a Bra Size with the Calculator

Let’s walk through a real example:

  • Underbust: 32 inches
  • Overbust: 37 inches

Step 1: Add 4 to the underbust → 32 + 4 = 36 band size.
Step 2: Subtract band size from overbust → 37 – 36 = 1-inch difference.
Step 3: Use the cup chart → A 1-inch difference corresponds to an A cup.

✅ Final Result: 36A

This quick process saves time and eliminates the confusion of guessing your size.

Why Accurate Bra Sizing Matters

Wearing the correct bra size isn’t just about appearance — it has real benefits:

  • Comfort: No more straps digging in or bands riding up.
  • Posture: A well-fitted bra supports your back and shoulders.
  • Confidence: Clothes fit better, and you feel more comfortable in your skin.
  • Health: Prevents pain in the shoulders, neck, and chest.

Additional Tips for Measuring Correctly

  • Always measure while wearing a non-padded bra for accuracy.
  • Keep the tape snug but not tight.
  • Stand in front of a mirror to ensure the tape is level around your body.
  • If you’re between sizes, try both to see which feels more supportive.
  • Recheck your size every 6–12 months since body shapes and sizes can change.

Use Cases of the Bra Size Calculator

This tool can be helpful in many scenarios:

  • Online Shopping: Avoid the risk of ordering the wrong size.
  • Weight Changes: Track if your bra size has changed after weight loss or gain.
  • Pregnancy/Postpartum: Easily update your measurements during body changes.
  • Teenagers/New Wearers: A quick way to find the right size when buying a first bra.
  • Everyday Fit Check: Make sure your current bras are still the right size.

Frequently Asked Questions (FAQs)

1. How accurate is this bra size calculator?
The calculator provides a highly accurate starting point. However, different brands may vary slightly in sizing.

2. Do I need a soft measuring tape?
Yes, a soft, flexible measuring tape ensures more precise results.

3. What if my overbust is smaller than my underbust?
That means the values were entered incorrectly — always ensure the overbust is larger.

4. How do I know if my bra fits correctly?
The band should sit snugly, the straps shouldn’t dig in, and the cups should fully support your bust without gaps or spillage.

5. Why does the calculator add 4 inches to the underbust?
This is a standard method used to convert ribcage measurements into traditional band sizes.

6. Can this calculator work for plus sizes?
Yes, it supports underbusts up to 60 inches and overbusts up to 70 inches.

7. How often should I remeasure myself?
Every 6–12 months or whenever your weight or body shape changes.

8. Can I use this tool if I’m pregnant or breastfeeding?
Yes, but expect frequent changes in size. Always prioritize comfort and support.

9. What if my result doesn’t match the bras I already own?
It may be that your current bras are the wrong size. Try on your calculated size for comparison.

10. How is cup size calculated?
It’s based on the difference in inches between your band size and overbust measurement.

11. What does AA or DDD mean?
These are cup size labels — AA is smaller than A, while DDD/F is larger than DD.

12. Can this calculator be used internationally?
This version is based on U.S. sizing. Some countries use different sizing systems.

13. What if the calculator shows “L+”?
That means the difference between band and bust exceeds the standard chart. You may need a specialty bra.

14. Does bra size affect breast health?
An incorrect size can cause discomfort and posture problems, but it doesn’t affect breast health directly.

15. How do I measure without help?
Use a mirror and make sure the tape is level across your body.

16. What if I’m between two sizes?
Try both — sometimes the smaller band with a larger cup (sister size) fits better.

17. Can men use this calculator for chest support garments?
Yes, anyone needing chest measurements for supportive wear can use this tool.

18. Do sports bras use the same sizing?
Most sports bras use standard sizing, but some may follow small/medium/large systems instead.

19. What’s the difference between band size and bust size?
Band size is around your ribcage; bust size is the fullest part of your chest.

20. Should I measure standing or sitting?
Standing gives the most accurate measurement, but sitting can be useful if you usually wear bras while seated.

Final Thoughts

Finding the perfect bra size doesn’t need to be frustrating. With our Bra Size Calculator, you can measure yourself at home and get reliable results in seconds. Whether you’re shopping online, checking if your current bras still fit, or buying your first bra, this tool is designed to make the process simple, fast, and accurate.