Bra Size Calculator designed for precise band and cup estimation using multiple bust positions, ribcage elasticity, tissue firmness, projection, sister sizing, and international conversions, delivering practical sizing guidance for everyday bra shopping confidence. Suitable for daily wear decisions.
Underbust (Band)
Overbust (Cup)
bust
PERFECT FIT
STARTING SIZE
—
UK: —
EU: —
01
Size Verdict
Primary US Size
—
Most likely starting point.
SystemUS Standard
ConfidenceHigh
Sister Up Size
—
For looser band preference.
Band+2″
CupAdjusted
Sister Down Size
—
For firmer support needs.
Band-2″
CupAdjusted
02
Measurement Math
Band Raw vs Rounded
—
Snug measurement to band size.
Raw—
LogicABTF
Cup Diff & Index
—
Inches of breast volume.
Diff—
Index—
Bust Selection Source
—
Calculation priority used.
Source—
Reason—
03
Shape Physics
Projection Type
—
Based on Lean vs Stand diff.
Delta—
Factor—
Tissue Firmness
—
Based on Lying vs Standing.
Delta—
State—
Volume Per Breast
—
Hemispherical estimation.
Vol—
Mass—
04
Fit Engineering
Band Elasticity Score
—
Ribcage compressibility.
Delta—
Type—
Root Width Class
—
Derived from projection data.
Root—
Wire—
Center Gore Compatibility
—
Recommended center height.
Height—
Reason—
05
Purchase Intelligence
UK Size
—
Standard United Kingdom.
EU Size
—
Standard European (cm).
Brand Risk Level
—
Likelihood of fit variance.
Index—
Risk—
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