<Dl> <Dd> adult shoe size ≈ (3 × heel to toe length in inches) − 23 (\ displaystyle (\ mbox (adult shoe size)) \ approx (3 \ times (\ mbox (heel to toe length in inches))) - 23) </Dd> </Dl> <Dd> adult shoe size ≈ (3 × heel to toe length in inches) − 23 (\ displaystyle (\ mbox (adult shoe size)) \ approx (3 \ times (\ mbox (heel to toe length in inches))) - 23) </Dd> <P> Note: some manufacturers choose to use a constant other than 25, so sizes do vary in either direction e.g. A shoe marked as a European size 40 may also be marked as a UK: 6 by Jimmy Choo, Nike; a 6 ⁄ by Adidas, Clarks, Dr Martens, Fred Perry, Karrimor, Monsoon, New Balance, Reebok, and Slazenger; a 7 by Converse, Gap, Pavers, and Timberland; and a 7 ⁄ by Crocs . Some retailers mark a larger size on women's European compatible which can cause confusion with the UK unisex sizes . A size 8 should be a European 42 in both male and female shoes, but this is often marked as a 9 for women . </P> <P> For men and children's footwear the UK system is followed . Women's footwear has a slightly different sizing that is unique . It is in between the UK and US's sizings . </P>

What is a 42 shoe size in american
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