Find your true bra size in under a minute
Measure once, get sizes across Australia, New Zealand, the USA, the UK, Canada, Europe, and more — all from the same two numbers.
Wrap the tape snugly around your ribcage, directly under your bust.
Wrap the tape around the fullest part of your bust.
Your size
How to measure yourself correctly
Use a soft measuring tape, not a rigid one, and measure over a thin, unpadded bra or bare skin. Keep the tape snug but not tight — you should be able to fit one finger underneath. Measure your band while breathing normally, and your bust at its fullest point, usually right across the nipple line.
Frequently asked questions
How do I measure my band size?
Wrap a soft tape measure snugly around your ribcage, directly under your bust, keeping the tape level and parallel to the floor. Read the measurement in a normal breath, not while flexing your chest out.
How do I measure my bust size?
Wrap the tape around the fullest part of your bust, usually across the nipple line, keeping the tape level around your back. Wear a non-padded bra or measure without one for the most accurate reading.
What if my measurement falls between two sizes?
Sister-size up: try the next cup letter with the next band size down (for example, if 34C feels tight in the band, 32D uses the same cup volume with a snugger band). Fit varies by brand, so treat the calculator's result as your starting point for trying styles on.
Why do UK and US sizes look the same but fit differently?
Band numbers match between the UK and US, but cup letters diverge above a D cup — a UK DD is roughly a US E, for instance. Always check a specific brand's size chart when shopping across regions.