This chart ranks the Am Law 200 by the average pro bono hours performed by their U.S.-based lawyers in 2018. Calculations are based on lawyer counts as of Dec. 31, 2018.

We define pro bono work as legal services donated to ­organizations or individuals that could not otherwise afford them. We do not include work done by paralegals or summer associates, nor time spent on bar association work, nor on nonlegal work for charities or on boards of nonprofit organizations.