Sports Bra Size Calculator: S, M, L Size and Support for Your Activity
Free tool · Updated October 2, 2026 · By CouponTalk
Your result
Enter your measurements to see your result.
Quick answer
Sports bras in S, M, L sizes are sized mostly by band. Your band is your underbust rounded to the nearest even inch: 32 is S, 34 is M, 36 is L. Cups D and above need a cup-sized sports bra or one size up. For running and other high-impact sports, choose an encapsulation style with separate cups and adjustable straps; compression bras are fine for yoga and walking.
How to measure
- Measure snugly around your ribcage just under the bust.
- Measure loosely around the fullest part of your bust.
- Choose your main activity to get the support style.
Sports Bra Size Chart
| Band (underbust rounded) | Letter size | With D cup or above |
|---|---|---|
| 28–30 | XS | S or cup-sized |
| 32 | S | M or cup-sized |
| 34 | M | L or cup-sized |
| 36 | L | XL or cup-sized |
| 38 | XL | XXL or cup-sized |
| 40 | XXL | 3XL or cup-sized |
| 42 | 3XL | 4XL or cup-sized |
Support needs vary. If a bra moves when you jump, it is not supportive enough for high impact.
Frequently asked questions
Should a sports bra be tighter than a regular bra?
Yes, it should feel firm, but you should still breathe deeply and fit one finger under the band.
Why does my sports bra ride up?
The band is too loose. Go down a size or choose an adjustable hook band.
How often should I replace a sports bra?
Every 6–12 months with regular use, or when the band no longer feels firm.
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