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To save you a click on this ‘article’ which is just a recap of a Reddit thread
navigating to: Help > Steam support > My account > Data related to your Steam account > External funds used.
But does it calculate on the price you paid or the default price of the games? Because that’d make a big difference
Me? I just get close enough to that math via glances at my Points that’re worthless otherwise and the Shelf of Shame that is my not-installed-yet(ever) library section — which is easily half, at a guess, and stands in daunting triple digits. 😅