Sports Bra Size Calculator
Find your perfect sports bra size based on your measurements, activity level, and support needs. Get personalized recommendations for running, yoga, HIIT, and more.
Enter Your Measurements
Measure snugly around ribcage, directly under bust
Measure around fullest part of bust
Your Sports Bra Recommendation
Band Size:
Cup Size:
1"=A, 2"=B, 3"=C, 4"=D, 5"=DD, 6"=DDD
Alpha Size Conversion:
Support Level Formula:
Larger cups + higher impact = higher support needed
Understanding Sports Bra Support Levels
Low Impact
Activities: Yoga, Pilates, walking, stretching, barre
Features:
Light compression, pullover style, wireless comfort, breathable fabric
Best for: A-C
cups with minimal movement activities
Medium Impact
Activities: Cycling, hiking, weight training, dance,
skiing
Features: Moderate compression, adjustable straps,
moisture-wicking
Best for: A-DD cups with moderate bounce activities
High Impact
Activities: Running, HIIT, jumping, aerobics, basketball,
tennis
Features: Encapsulated cups, underwire option, maximum compression, wide
straps
Best for: All cup sizes with high-bounce activities
Sports Bra Size Chart
| Band | A Cup | B Cup | C Cup | D Cup | DD Cup | DDD Cup |
|---|---|---|---|---|---|---|
| 30 | XS | XS | S | S | M | M |
| 32 | XS | S | S | M | M | L |
| 34 | S | S | M | M | L | L |
| 36 | S | M | M | L | L | XL |
| 38 | M | M | L | L | XL | XL |
| 40 | M | L | L | XL | XL | 2XL |
| 42 | L | L | XL | XL | 2XL | 2XL |
How to Measure for a Sports Bra
Wear an Unpadded Bra
For accurate measurements, wear a lightweight, non-padded bra or no bra at all.
Measure Your Underbust
Wrap tape firmly around ribcage, directly under your bust. Keep tape level and snug - sports bra bands should be tighter than regular bras.
Measure Your Full Bust
Measure around the fullest part of your bust, keeping tape parallel to the floor. Don't compress or pull too loose.
Identify Your Activity
Consider your primary workout type. High-impact activities require more support than low-impact exercises.
Calculate Your Size
Enter measurements and activity into our calculator for your personalized size and support recommendation.
Sports Bra Fitting Tips
- Sports bra bands should feel tighter than regular bras - this provides better support
- Jump up and down to test bounce control before purchasing
- Try the bra on while moving your arms overhead - straps shouldn't dig in
- For larger busts (D+), consider encapsulated sports bras over compression styles
- Replace every 6-12 months or after 72 washes as elasticity decreases
- Size up if you experience chafing, numbness, or difficulty breathing
Frequently Asked Questions
A properly fitting sports bra should feel snug but not restrictive. The band should sit firmly and level around your ribcage without riding up. Cups should fully contain all breast tissue without spillage or gapping. Straps should stay in place without digging into shoulders. You should be able to fit two fingers under the band.
Low impact: For yoga, walking, stretching - light support, maximum comfort. Medium impact: For cycling, hiking, weight training - moderate compression and support. High impact: For running, jumping, HIIT - maximum support with encapsulated cups and firm compression to minimize breast movement.
Generally, stick with your regular bra size or consider sizing down one band size for high-impact activities. Sports bras should fit more snugly than everyday bras. If between sizes, size down for more support or up for more comfort during low-impact activities.
Replace sports bras every 6-12 months with regular use (3-4x per week), or after approximately 72 washes. Signs you need a new one: the band feels loose even on the tightest hook, straps won't stay up, fabric is stretched or pilling, or you notice reduced support during exercise.
Compression bras press breasts against the chest - best for smaller busts (A-C) and low-medium impact. Encapsulation bras have separate cups like regular bras - better for larger busts (D+) and provide more natural shape. Combination bras offer both for maximum support during high-impact activities.
Related Calculators
Official Resources
Created by OmniCalculator.space | Last Updated: January 2026