| 2011 | Founded at Oxford by Benjamin Todd and William MacAskill | Founding | Started as a student project; helped establish effective altruism alongside Giving What We Can and CEA. |
| 2012 | First full-time staff hired | Milestone | Organization professionalizes; begins systematic research. |
| 2012 | Co-founded EA movement | Milestone | Helped establish effective altruism alongside Giving What We Can and CEA. |
| 2015 | Y Combinator acceptance | Milestone | One of the first nonprofits in YC; gained startup methodology and credibility. |
| 2016 | AI safety becomes top priority | Pivot | Identified risks from AI as the most pressing problem area. |
| 2016 | Published career guide book | Publication | 80,000 Hours: Find a fulfilling career that does good. |
| 2017 | Podcast launch | Launch | Rob Wiblin begins hosting The 80,000 Hours Podcast. |
| 2020 | Reached 14 FTEs | Milestone | Steady organizational growth. |
| 2022 | Leadership transition — Howie Lempel becomes CEO | Leadership Change | Benjamin Todd moves from CEO to President; Howie Lempel becomes CEO. |
| 2022 | Reached 25 FTEs | Milestone | Organization nearly doubles in size. |
| 2024 | Niel Bowerman appointed CEO | Leadership Change | Former FHI Assistant Director takes over as CEO. |
| 2025 | Strategic shift to AGI focus announced | Pivot | Announced focus on navigating transition to powerful AGI. |
| Apr 2025 | Spin-out from Effective Ventures | Pivot | Became an independent nonprofit (April 1, 2025). |