Convert the European bed measurements from centimeters to feet and inches. Divide by 2.54, the number of centimeters equivalent to one inch, and then divide the number of inches by 12 to convert to feet. Express the remainder as inches. The result is a European bed size converted into feet and inches.
For example, the smallest standard European single bed measures 80 cm by 190 cm. Dividing by 2.54 gives dimensions of roughly 31 by 75 inches. Dividing by 12 and keeping the remainder as inches yields a size of 2 feet 7 inches by 6 feet 3 inches. Bedding for a European single bed will, therefore, probably fit a bed that's 2 feet 9 inches by 6 feet 3 inches.
Familiarize yourself with the standard bed and bedding sizes used in the United States, concentrating on the dimensions rather than the names. The standard sizes are:
Single/twin: 3 feet 3 inches by 6 feet 3 inches
Full: 4 feet 6 inches by 6 feet 3 inches
Full extra long: 4 feet 6 inches by 6 feet 8 inches
Queen: 5 feet by 6 feet 8 inches
Olympic queen: 5 feet 6 inches by 6 feet 8 inches
King: 6 feet 4 inches by 6 feet 8 inches
California king: 6 feet by 7 feet
Match the converted European dimensions with those of the standard U.S. bed sizes. The U.S. equivalent is the size most closely matching the converted European one. For example, a duvet designed for a European 90 cm by 190 cm -- 2 feet 11 inches by 6 feet 3 inches -- bed is the nearest equivalent of a duvet designed for a U.S. single/twin bed.