What factor determines the number of electors for each state?

A state's number of electors equals the number of representatives plus two electors for both senators the state has in the United States Congress. The number of representatives is based on the respective populations, determined every 10 years by the United States Census. A state's number of electors equals the number of representatives plus two electors for both senators the state has in the United States Congress. The number of representatives is based on the respective populations, determined every 10 years by the United States Census.