Joe Biden became president of the United States when he was inaugurated as the 46th president on January 20, 2021.

Quick Scoop: When did Joe Biden become president?

The exact date and moment

  • Joe Biden took the presidential oath of office on January 20, 2021, in Washington, D.C.
  • The swearing‑in happened late in the morning (around 11:49 a.m. EST), just before the official start of the presidential term at noon that day.
  • This ceremony marked the beginning of his four‑year term as the 46th president, alongside Kamala Harris as vice president.

A tiny bit of context

  • The inauguration followed the 2020 U.S. presidential election, which was held on November 3, 2020.
  • Biden became president‑elect after winning that election and then formally became president at the inauguration on January 20, 2021.

Forum-style summary

In simple terms: Joe Biden officially became president on January 20, 2021, the moment he took the oath of office at his inauguration.

TL;DR: Joe Biden became president on January 20, 2021, when he was inaugurated as the 46th president of the United States.

Information gathered from public forums or data available on the internet and portrayed here.