Just for his foundation, as of 2013 he had donated 28 billions. From https://en.wikipedia.org/wiki/Bill_%26_Melinda_Gates_Foundation https://en.wikipedia.org/w

Just for his foundation, as of 2013 he had donated 28 billions. From https://en.wikipedia.org/wiki/Bill_%26_Melinda_Gates_Foundation https://en.wikipedia.org/wiki/Bill_%26_Melinda_Gates_Foundat... >As of May 16, 2013, Bill Gates had donated US$28 billion to the foundation.[1][9] Citations: http://www.gatesfoundation.org/about/Pages/foundation-timeline.aspx http://www.gatesfoundation.org/about/Pages/foundation-timeli... https://www.bloomberg.com/news/2013-05-16/bill-gates-retakes-world-s-richest-title-from-carlos-slim.html https://www.bloomberg.com/news/2013-05-16/bill-gates-retakes... Apparently he is worth 90 billions. Let's assume he has donated 2 more billions in the last 4 years to make it 30 billion. That means he donated 25% of his worth to his foundation. I'm sure he has donated money to other things.