Rethink Charity

Powering High-Impact Charitable Projects

Local Effective Altruism Network

The Local Effective Altruism Network (LEAN) supports over 350 local groups across the world, helping them have the most impact through empirical research and strategic advice.

  • • Local groups appear to be a primary source of converting EAs - A majority (>53%) of members found local groups to be a ‘’large’ to ‘very large’ factor for their involvement in EA.
  • • LEAN is among the most useful organizations to the operation of local groups - group organizers found CEA most useful (39), followed by LEAN (22) and the Effective Altruism Foundation (22).
  • • Local groups estimated counterfactual fundraising - $51,495.36 moved to effective charities in 2017, and $806,832.93 in influenced personal donations.
  • • Strong demand for support from local groups >90% rated practical support and ideas for group activities useful or very useful and almost 80% rated personal feedback and support via social media, email and video call as useful or very useful
  • • Counterfactually discounted value of a medium group is estimated by .impact as $250,000 – $1,500,000.
  • • Counterfactually discounted value of a large group is estimated by .impact as $1,000,000 – $3,000,000.
  • • LEAN seeded ~158 groups.

If you're interested in getting support for running a local Effective Altruism group, please visit