Specialty Size Tools
Bra fitting, maternity, plus size, tall and other specialised sizing helpers. All 4 tools below run in your browser with no sign-up and no data leaving your device.
Bra Band & Cup Size Calculator
Calculate band and cup size from underbust and overbust measurements.
Plus Size Converter
Convert extended and plus sizes across US, UK, EU and alpha labels.
Maternity Size Converter
Convert pre-pregnancy sizes into maternity labels across regions.
Petite & Tall Size Guide
Compare petite and tall sizing against standard height ranges.
Getting the most from specialty sizing
Conversion tables translate one label into another, but they cannot account for how a specific brand drafts its patterns. Use a converter to narrow the range, then compare the result against the product's own measurement chart before ordering.
Keep a written record of your key measurements in centimetres. With those numbers, any chart in any region becomes readable, regardless of which labelling family it uses.
Frequently Asked Questions
Are bra calculators exact?
They give a strong starting point. Cup lettering differs between UK, US and EU makers, so try sister sizes if the band or cup feels off.
What is a sister size?
A neighbouring band and cup combination with a similar cup volume, for example 34C and 36B.