This is generally a poor way to measure the 'effectiveness' of a charity. The amount of overhead is irrelevant; if a charity is doing 100x more good per dollar than the next best charity, you should donate to it regardless of how much the CEO earns.
ADRA has spent decades building, and continues to build, a flywheel.
https://adra.org/wp-content/uploads/2019/10/Annual-Report-20...
// Disclosure: I lived in Africa for a decade, observed and participated in work by multiple humanitarian organizations “on the ground”.
This is generally a poor way to measure the 'effectiveness' of a charity. The amount of overhead is irrelevant; if a charity is doing 100x more good per dollar than the next best charity, you should donate to it regardless of how much the CEO earns.