British Bra Size Calculator delivers accurate UK bra sizing using modern ABTF methods. Calculates band and cup size from multiple measurements, shows sister sizes, fit indicators, market availability, and US/EU conversions for reliable everyday bra selection.
Underbust (Band)
Overbust (Cup)
IN STOCK
UK SIZE
—
US: —
STANDARD
01
UK Size Verdict
Primary UK Size
—
Most accurate starting point.
Band—
Cup—
Sister Size (Support)
—
Mechanical equivalence.
Band-2″
Cup+1
Sister Size (Comfort)
—
Mechanical equivalence.
Band+2″
Cup-1
02
Fit Analysis
Band Elasticity
—
Ribcage compressibility.
Squish—
Rec—
Cup Volume Index
—
Standardized volume unit.
Diff—
Index—
Projection Type
—
Shape characteristic.
Delta—
Style—
03
Tissue Dynamics
Tissue Firmness
—
Density estimate.
Lying—
Class—
Wire Width
—
Root width proxy.
Root—
Rec—
Gore Tack Prob.
—
Center fit likelihood.
Prob—
Cond—
04
Market Intelligence
UK Brand Match
—
Core vs Alt brands.
Core—
Alt—
Retail Availability
—
In-store vs Online.
Store—
Flag—
Return Risk
—
Likelihood of fit variance.
Level—
Adv—
05
Global Conversions
US Equivalent
—
Explicit translation.
Cup—
SysUS Std
EU Equivalent
—
Standard European size.
Band—
Cup—
System Drift
—
Volume loss warning.
Drift—
StatInfo
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