Sports Bra Calculator – Find Your Size & Support Level
Not all sports bras fit the same. Enter your measurements and activity level to get the right size for your workout – low, medium, or high impact. Compare US, UK, EU, AU, and FR sizing.
Sports Bra Size Finder
Measure snugly under your bust – sports bras run tight, so take a firm measurement.
Measure around the fullest part of your chest – don't compress tissue.
Select your main activity – this determines the support level recommendation.
34C
34C
75C
12C
90C
Need a different method? Try the Standard Bra Size Calculator or Sister Size Finder.
Why Sports Bras Fit Differently
Sports bras are designed to minimize breast movement during physical activity. Unlike everyday bras, they use compression (flattening) or encapsulation (separate cups) to reduce bounce. Sports bras also run tighter in the band – you may need to size up in the cup or band depending on the style and activity level.
Choose the Right Support Level
🧘 Low Impact
Yoga, walking, pilates, stretching. Light compression, comfortable fit. Look for seamless, wire-free styles.
Tip: Stick to your regular size for low impact.
🚴 Medium Impact
Cycling, gym, hiking, dance. Moderate compression or encapsulation. Look for adjustable straps and a wider band.
Tip: Size down in the band for extra support.
🏃 High Impact
Running, jumping, HIIT, plyometrics. Maximum support with encapsulation or firm compression. Look for racerback styles and moisture-wicking fabric.
Tip: You may need to size up in the cup for high impact.
How to Measure for a Sports Bra
Follow these steps for the best sports bra fit:
- Measure your underbust: Take a firm, snug measurement – sports bras need a tighter band for support.
- Measure your bust: Stand straight and measure around the fullest part – don't compress the tissue.
- Select your activity: Choose low, medium, or high impact based on your main workout.
- Click "Find My Sports Bra Size": Get your recommended size and support level.
Need more help finding your size?
Use the Bra Size CalculatorFrequently Asked Questions
Should I size up or down for a sports bra?
Sports bras typically run tighter in the band for support. Many women size down in the band and up in the cup – especially for high impact activities. Always check the brand's size guide.
What's the difference between compression and encapsulation?
Compression bras flatten the breasts against the chest – good for smaller busts. Encapsulation bras have separate cups that support each breast individually – better for larger busts and high impact.
Can I wear a sports bra for everyday use?
You can, but sports bras are designed for movement and may not provide the same shaping as everyday bras. For daily wear, choose a low-impact style for comfort.
Does IMRango store my measurements?
No. Everything runs locally in your browser. We do not collect, store, or share any of your personal data or measurements.