Find your perfect sports bra size in under 60 seconds. Our free calculator analyzes your measurements and activity level to recommend the ideal support for your workout.
Sports Bra Size Calculator
Enter your measurements and workout style for personalized sports bra recommendations.
How to Measure for a Sports Bra
Measure Your Underbust (Band Size)
Wrap a soft measuring tape snugly around your ribcage, directly under your bust. Keep the tape level and breathe normally. Round to the nearest whole number - this is your band measurement.
Measure Your Bust
Measure around the fullest part of your bust, keeping the tape parallel to the floor. Don't pull too tight - the tape should be snug but not compressing. This measurement helps determine your cup size.
Consider Your Activity Level
Different activities require different levels of support. Running and jumping need maximum support, while yoga and walking need less. Choose a sports bra designed for your primary activity level.
- High Impact: Running, HIIT, CrossFit, Aerobics, Tennis, Basketball
- Medium Impact: Cycling, Hiking, Dancing, Skiing, Rowing, Skating
- Low Impact: Yoga, Pilates, Walking, Stretching, Weight Training, Barre
Types of Sports Bras Explained
Compression Sports Bras
Press breasts against the chest wall to minimize movement. Best for A-C cups during low to medium impact activities. Usually pull-on style without cups or underwire.
Encapsulation Sports Bras
Separate cups support each breast individually, similar to a regular bra. Provides better shape and support for larger cups. Often has underwire and adjustable straps.
Combination/Hybrid Sports Bras
Combines compression and encapsulation for maximum support. Features molded cups plus an outer compression layer. The gold standard for high-impact activities.
Sports Bra Size Chart
Use this chart to convert your measurements to sports bra size. Remember that sizing may vary between brands.
| Underbust | Band Size | XS | S | M | L | XL |
|---|---|---|---|---|---|---|
| 26-28" | 30 | A-B | C | D | DD | DDD+ |
| 28-30" | 32 | A-B | C | D | DD | DDD+ |
| 30-32" | 34 | A-B | C | D | DD | DDD+ |
| 32-34" | 36 | A-B | C | D | DD | DDD+ |
| 34-36" | 38 | A-B | C | D | DD | DDD+ |
| 36-38" | 40 | A-B | C | D | DD | DDD+ |
Sports Bra Size Calculator FAQ
Measure your underbust snugly around your ribcage, then measure around the fullest part of your bust. The difference between these measurements determines your cup size. For sports bras, also consider your activity level - high impact activities like running need more support than yoga or walking.
For running and other high-impact activities, start with your regular bra size but choose a high-impact sports bra with encapsulation cups, wide straps, and a snug band. Many runners prefer sizing down in the band for extra support. Look for bras specifically designed for running with features like bounce-reduction technology and moisture-wicking fabric.
Yes, sports bras should fit more snugly than regular bras, especially for high-impact activities. The band should be firm but not restrictive - you should be able to fit two fingers under the band. When you jump up and down, there should be minimal bounce. The straps should stay in place without digging into your shoulders.
Compression sports bras press breasts against the chest to minimize movement and work best for smaller cup sizes (A-C) during low to medium impact activities. Encapsulation bras have separate cups that support each breast individually, providing better support for larger cups (D+) and high-impact activities. Combination bras offer both compression and encapsulation for maximum support.
Replace your sports bra every 6-12 months with regular use (3-4 times per week), or after approximately 72 washes. Signs you need a new sports bra include: the band rides up your back, straps slip off or dig in, you notice more bounce than before, or there's visible wear like stretched elastic or pilling. High-impact activities and frequent washing will wear out bras faster.
It's not recommended. Regular bras aren't designed to handle the movement and moisture of exercise. Without proper support, breast tissue can stretch and become damaged over time - this is irreversible. Sports bras are engineered to minimize bounce, wick moisture, and provide activity-appropriate support. Even for low-impact activities like walking, a sports bra offers better comfort and protection.
For larger cup sizes (D and above), look for encapsulation or combination sports bras with: separate molded or underwire cups, wide padded straps that won't dig in, a strong supportive band with multiple hook closures, and moisture-wicking fabric. Brands like Panache Sport, SheFit, Enell, and Brooks are known for excellent plus-size and large-cup sports bras. Avoid compression-only styles which can be uncomfortable and provide inadequate support.