How To Measure Bra

Band Measurement

Band Measurement

Measure just below your bust by wrapping the tape around your ribcage (ensure it’s snug but not tight) and note the measurement.

Bust Measurement

Bust Measurement

Measure around the fullest part of your bust, then subtract the band size to determine your cup size using the cup size chart.

Strap Measurement

Strap Measurement

Start to measure from the top of the strap straight to the bottom hem of the band.

Tips for Accuracy

Measure band size around your ribcage, not your bust. Wear an unpadded bra or no bra. Measure snugly just under your bust to measure your size.
Measure bust size at the fullest point. Rest it against the breast tissue without pulling it tight.
Calculate cup size by subtracting your band measurement from your bust measurement. Each inch of difference equals one cup size: 1″ = A, 2″ = B.
Re-measure weekly if possible. Breast size can fluctuate due to different reasons. Measuring 2–3 times and averaging gives the most consistent result.
Fit the bra on the last hook. A new bra should fit well on the last hook allowing tightening [ band stretches over time ]. If it’s already tight, increase band size.

FAQ

My bra always feels tight in the band but fits in the cup, what does that mean?

Go up one band size and down one cup size. A 34C and 36B have the same cup volume but different band circumferences. This is called sister sizing and resolves band discomfort without changing cup fit.

If the cup wrinkles or sags, it’s too large. If breast tissue spills over the top or sides, it’s too small. The cup should encapsulate all breast tissue smoothly with no gaps or spillover.

Standard retail carries a narrow size range. Specialist bra retailers and online brands carry much wider ranges (28–44 bands, A–K cups). Also try sister sizes if your calculated size is unavailable.

At least once a year, and after significant weight changes (10+ lbs), pregnancy, breastfeeding, or hormonal shifts like starting or stopping birth control.

Yes, significantly. UK, US, EU, French, and Australian sizing systems differ — particularly in cup labeling. Always check the brand’s own size chart and, when possible, compare actual garment dimensions (cup depth, band circumference) rather than relying on the label. Refer to our bra size chart for conversions.