42 US/UK band sizes to Italian band sizes

How to convert 42 US/UK to IT

IT = US/UK × 0.5 − 15

1. Take the value: 42 US/UK.
2. Multiply by 0.5: 42 × 0.5 = 21.
3. Subtract 15: 21 − 15 = 6.
4. So 42 US/UK = 6 IT.

Sizes come in steps of 1, so the nearest Italian band size size is 6. This converts the band (number) part of a bra size only. Cup letters also differ between systems (for example, US DDD is UK E), so check the brand's chart for cups.