Standard US President Term Length
A US president serves a four-year term. The Constitution sets this fixed duration for the office of the president. A president may be elected to the position twice, for a maximum of eight years in office.
Term Limits and Exceptions
The 22nd Amendment limits a president to two elected terms. A person who succeeds to the presidency and serves more than two years of a predecessor's term may only be elected once more. This rule shapes the maximum possible duration in office.
Historical Averages and Transitions
On average, US presidents have served about five years in office. Some left early due to death, resignation, or electoral defeat. Others completed two full terms. The 20th Amendment changed the start date of a term to January 20, affecting precise duration calculations.
For more details on presidential terms, see the 22nd Amendment to the U.S. Constitution.
