As a direct or indirect result of active violence (so deaths in and around warzones the US created, whether those deaths were to bombs, deprivation, or other causes following displacement from their homes)? Somewhere under ten million, probably.

As a result of the US violently imposing capitalism and serving as a hegemonic defender of the capitalist system? Somewhere below 200 million, counting all deaths from preventable disease and deprivation that happened in capitalist states in the periphery. Are these numbers fair and accurate? Maybe, maybe not, but they're 100% more honest than the sorts of figures anticommunists throw around, and I can guarantee that if a wave of socialist revolution were to sweep the periphery, even if the new governments managed to halve that death toll every year as they built new infrastructure and systems, the anticommunists would blame them for every single death they failed to prevent, so it's only fair to blame the capitalists for every single death they allow to happen through negligence and a complete and utter lack of concern for human life.