The total number of electoral votes in the Electoral College is 538. It is determined by three parts, according to the Constitution Article II, Section 1, amended by the Twent … y-third Amendment.   The first number is the 435 in the US House of Representatives. The second number is the 100 in the US Senate. Third number is the three electoral college votes given Washington, D.C. by the Twenty-Third Amendment.   The power to elect a president changes every ten years by the decennial census.