square-kilometer hectare square-meter square-centimeter square-mile acre square-foot square-inch square-kilometer square-mile hectare acre millimole-per-liter item-per-cubic-meter liter-per-100-kilometer liter-per-100-kilometer liter-per-kilometer kilometer-per-centiliter kilometer-per-centiliter mile-per-gallon mile-per-gallon-imperial day hour minute second millisecond microsecond nanosecond minute-and-second second kilowatt-hour foodcalorie kilocalorie kilometer meter centimeter mile foot inch millimeter centimeter inch centimeter foot-and-inch inch meter-and-centimeter centimeter inch millimeter kilometer meter meter meter mile foot foot mile yard yard mile-scandinavian kilometer meter meter centimeter inch foot-and-inch meter meter-and-centimeter kilometer meter meter mile foot metric-ton kilogram gram milligram microgram ton pound ounce kilogram gram kilogram-and-gram pound pound-and-ounce stone-and-pound pound-and-ounce pound-and-ounce milligram-per-deciliter kilogram-per-cubic-meter gigawatt megawatt kilowatt watt milliwatt kilowatt horsepower hectopascal inch-ofhg millibar millimeter-ofhg megapascal pascal pound-force-per-square-inch kilometer-per-hour mile-per-hour kilometer-per-hour meter-per-second mile-per-hour celsius fahrenheit celsius fahrenheit cubic-meter cubic-centimeter cubic-foot cubic-inch liter milliliter gallon quart pint cup fluid-ounce tablespoon teaspoon gallon-imperial fluid-ounce-imperial barrel gallon liter year month year-person year-person-and-month-person month-person