In Korea, recipes use a 200 ml measuring cup, while a US cup is about 236.6 ml. Butchers sell meat by the geun (근), which is 600 g for meat but 375 g for vegetables.
Clothing and shoes: overseas size charts often use inches; a 32-inch waist is 32 × 2.54 = 81.28 cm. Korean shoe sizes are in millimetres, so a US men's 9 is roughly 270 mm. Height in Korea is always given in centimetres: 5 ft 10 in is about 178 cm.
Common mistakes
Temperature cannot be converted by a ratio alone; Fahrenheit and Celsius have different zero points.
US and UK gallons and pints are different sizes.
A weight ounce (oz) and a fluid ounce (fl oz) are different units, and US (about 29.57 ml) and UK (about 28.41 ml) fluid ounces differ too.