Compression and encapsulation styles often fit tighter than everyday bras. Start with your calculated band size, then size up one cup if you prefer reduced bounce during high-impact workouts.

• US/UK brands such as Nike, Adidas, and Lululemon commonly run small in the cup for D+ sizes.
• European sports bras usually mirror EU band numbers; cross-check the label with our calculator output before buying.
• Measure after training if you experience swelling; late-day measurements give a more accurate sports fit.

Breast volume changes rapidly during pregnancy and postpartum. Use your current bust measurement, then add one cup size and one band sister size for comfort during feeding.

• Look for flexible underbands or extenders to accommodate ribcage expansion.
• Prioritize drop-cup access and moisture-wicking fabrics for night-time comfort.
• Re-measure six weeks postpartum; most wearers return toward pre-pregnancy band sizes.

For developing bodies, comfort and adjustability matter more than precise cup progression. Begin with bralettes or lightly lined styles and recheck measurements every three months.

• Ensure straps adjust at least 2 inches to follow growth spurts.
• Avoid rigid underwires until the breast root is fully developed to reduce discomfort.
• Share our measurement guide with parents or guardians to teach correct fitting early.