Computer system, method and program for estimating an increase in software license cost for executing a computer program with a first processor(s) instead of a second, less powerful processor(s). An identification is made of a plurality of computers in which the computer program is currently installed. The total processor power of the plurality of computers is determined. The existing license cost(s) for executing the computer program in the plurality of computers is determined. The existing license cost(s) is divided by the total processor power of the plurality of computers to determine license cost per unit of processor power. The difference of processor power between the first processor(s) and the second processor(s) is multiplied times the license cost per unit of processor power to estimate the increase in software license cost. Alternatives to paying the upgrade license fee are also considered. For example, a determination is made whether the computer program should be deleted from another computer to provide available processor power under an existing software license for the computer program to be executed with the first processor(s).