How many electoral votes are there in all?

There are 538 electoral votes in total. Every state's number of electoral votes is equal to 2 (number of senators) + the number of representatives in the United States House of Representatives. In other Words, 100 (members in Senate) + 435 (members in House of Reps), plus (according to the 23rd amendment) 3 for Washington, D.C. Thus 435+100+3=538. To win the presidency, 270 electoral votes are needed: 538/2=269+1=270.