4.5 kilograms is equal to 9.920801798319491 pounds. To convert kilograms to pounds, you can use the conversion factor of 2.20462262184878, which is the number of pounds in one kilogram. Therefore, to convert 4.5 kg to pounds, you can multiply 4.5 by 2.20462262184878 to get 9.920801798319491 pounds.