Find Your Perfect Fit!

Tweens Bonded Bras Size Calculator

Calculate Your Bra Size

in
Measure around your ribcage, directly under the bust.
in
Measure around the fullest part of your bust.

Size Chart (Inches)

Find your size based on under-bust and over-bust measurements.

SizeUnder-bust (in)Over-bust (in)
28A22.5 - 23.528 - 29
28B22.5 - 23.529 - 30
28C22.5 - 23.530 - 31
28D22.5 - 23.531 - 32
28DD/E22.5 - 23.532 - 33
28F22.5 - 23.533 - 34
30A23.5 - 25.530 - 31
30B23.5 - 25.531 - 32
30C23.5 - 25.532 - 33
30D23.5 - 25.533 - 34
30DD/E23.5 - 25.534 - 35
30F23.5 - 25.535 - 36
32A25.5 - 27.532 - 33
32B25.5 - 27.533 - 34
32C25.5 - 27.534 - 35
32D25.5 - 27.535 - 36
32DD/E25.5 - 27.536 - 37
32F25.5 - 27.537 - 38
34A27.5 - 29.534 - 35
34B27.5 - 29.535 - 36
34C27.5 - 29.536 - 37
34D27.5 - 29.537 - 38
34DD/E27.5 - 29.538 - 39
34F27.5 - 29.539 - 40
36A29.5 - 31.536 - 37
36B29.5 - 31.537 - 38
36C29.5 - 31.538 - 39
36D29.5 - 31.539 - 40
36DD/E29.5 - 31.540 - 41
36F29.5 - 31.541 - 42
38A31.5 - 33.538 - 39
38B31.5 - 33.539 - 40
38C31.5 - 33.540 - 41
38D31.5 - 33.541 - 42
38DD/E31.5 - 33.542 - 43
38F31.5 - 33.543 - 44
40A33.5 - 35.540 - 41
40B33.5 - 35.541 - 42
40C33.5 - 35.542 - 43
40D33.5 - 35.543 - 44
40DD/E33.5 - 35.544 - 45
40F33.5 - 35.545 - 46
42A35.5 - 37.542 - 43
42B35.5 - 37.543 - 44
42C35.5 - 37.544 - 45
42D35.5 - 37.545 - 46
42DD/E35.5 - 37.546 - 47
42F35.5 - 37.547 - 48
44A37.5 - 39.544 - 45
44B37.5 - 39.545 - 46
44C37.5 - 39.546 - 47
44D37.5 - 39.547 - 48
44DD/E37.5 - 39.548 - 49
44F37.5 - 39.549 - 50
46A39.5 - 41.546 - 47
46B39.5 - 41.547 - 48
46C39.5 - 41.548 - 49
46D39.5 - 41.549 - 50
46DD/E39.5 - 41.550 - 51
46F39.5 - 41.551 - 52

Why the Right Bra Size Matters

Wearing the correct size improves comfort, posture, and confidence. An ill-fitting bra can cause shoulder grooves, back/neck strain, and premature wear.

Common Signs of an Ill-Fitting Bra

  • Band rides up

    The band should sit firm and level around your torso—if it climbs, the band is likely too loose.

  • Straps dig in

    Straps support positioning only—if they’re carrying the load, tighten the band or choose a smaller band size.

  • Cups gape or overflow

    Cups should hug without spillage or empty space—try one cup up (for overflow) or down (for gaping).

  • Center gore doesn’t lie flat

    If the center bridge lifts away, the cup is often too small—go up a cup or try a different style.

Benefits of a Well-Fitting Bra

  • Improved posture and reduced back/neck pain
  • All-day comfort without constant adjusting
  • Smoother silhouette under clothing
  • Confidence boost from a secure, natural shape
  • Protects delicate breast tissue by distributing support

Why Choose Tweens Bonded Bras?

No elastic. No rashes. Just pure comfort.

Our seamless bonded designs use ultra-soft fabrics and an elastic-free bottom band that never digs or irritates—keeping you rash-free and effortlessly supported all day.

Understanding Sister Sizes

Sister sizes have the same cup volume but different band lengths—perfect when your exact size isn’t available or you prefer a tighter/looser band.

The Quick Rule

Go down one band → go up one cup

Go up one band → go down one cup

Tip: The band provides ~80% of support—choose the band that feels snug and secure.

Find Your Sister Sizes

Example: 34C → 32D (tighter band) or 36B (looser band).

Shop Our Collection

Found your size? Explore our wide range of Tweens Bonded Bras designed for comfort and style.