How many electoral votes are there?
Since 1964 the total number of electors has been 538. Each state
may appoint a number of electors equal to the state's total of U.S.
Senators & U.S. Representatives, and the District of Columbia
may appoint the same number of electors as the state with the
smallest population according to the 23rd Amendment to the U.S.
Constitution, which was ratified in 1961. There have been 435 seats
in the U.S. House of Representatives since 1912, there have been
100 seats in the U.S. Senate since 1959, and D.C. appoints 3
Overall there are a total of 538 electors and so 538 electoral votes.
Each state gets one electoral vote for each member of the House of Representatives and two electoral votes for the number of Senators. The number of members in the House of Representatives was fixed at 435 in 1911 and there are two senators from each state, for a total of 535 votes from all of the states. The District of Columbia get 3 votes to make the grand total 538.
It follows that the majority required to elect is 270 votes. (538/2 + 1 = 270)