Sports Bra Size Calculator by Impact Level
This sports bra size calculator factors impact level — the variable generic bra calculators skip. Yoga and pilates use light compression; running and HIIT need encapsulation; lifting needs maximum support. Enter your underbust and bust, pick your impact, and the tool returns the right sports bra size. Use the calculator below to get your exact fit in 30 seconds.
How it works
Measure yourself
Take your bust, waist, and hips with a soft tape. See the full measurement guide.
Enter the numbers
Type your measurements into the calculator above. Pick inches or cm — the tool converts both ways.
Get your size
Match the result against the brand's chart and order with confidence.
Sports bra by impact level
| Impact | Activity | Cup Style |
|---|---|---|
| Low | Yoga, pilates, walking | Compression / shelf |
| Medium | Cycling, light dance | Compression |
| High | Running, HIIT, basketball | Encapsulation + compression |
Frequently Asked Questions
What's the difference between compression and encapsulation sports bras?
Compression flattens the chest evenly — best for low/medium impact (yoga, walking). Encapsulation supports each cup individually — best for high impact (running, HIIT).
Should I size down for a sports bra?
No. Sizing down for compression is a myth that causes pain and rib bruising. Match your true band size.
How do I know if a sports bra is high-impact enough?
Look for a published 'impact level' rating (low/medium/high) and underwire or molded cups for D+ cups. Convertible straps mean high-impact.
Should the band feel tight in a sports bra?
Snug, not tight. You should be able to slide one finger under the band. Too-tight bands cause numbness; too-loose bands ride up during exercise.
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