Measuring your bra size correctly is essential for finding a comfortable, supportive fit. All you need is a soft measuring tape and two simple measurements: underbust (band size) and fullest bust (cup size).
This section explains how to measure at home, with or without a measuring tape, and how to adjust for posture, weight changes, pregnancy, or hormonal shifts.
If you’ve searched, “How do I measure my bra size at home?”, follow the step-by-step instructions here before using the bra size calculator for a final size estimate.
Accurate measurement reduces common fit problems and increases long-term comfort.
Yes, you can estimate bra size from a photo — but a picture alone cannot reliably determine an exact band and cup. A front photo can show spacing and root width, while a side photo adds projection information. Pair those visual clues with a snug underbust and loose full-bust measurement to turn…
Learn how bra sizes are measured and labeled in the USA, with step-by-step band and cup measurement and common sizing mistakes to avoid.
Get a practical guide to teen bra guide, including key sizing or fit considerations, common mistakes and useful next steps based on measurements.
Sister sizes are bra sizes with the same cup volume but different band lengths. To use sister sizing, go down a band and up a cup, or go up a band and down a cup. For example, 34DD = 32F = 36D. All three can fit the same breast volume, but the band tension, wire width, cup placement and comfort…
Bra cup size = bust measurement minus band (underbust) measurement. Each 1 inch (2.54 cm) of difference moves you up one cup: 1″ = A, 2″ = B, 3″ = C, 4″ = D, 5″ = DD, 6″ = DDD/F, 7″ = G, 8″ = H, 9″ = I, 10″ = J, 11″ = K in US sizing. UK and EU brands label the same measurement with different…
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