Steam never adds them up. This does: every game, all time.
Public profiles only. Free, read-only, no account needed.
HoursEvery game · all time
The total comes first, as hours and as full work weeks. Under it the same report draws the library as an iceberg: the few games that hold most of the hours stand above the water, and every other game has its place in the ice below.
Hours on record, one game at a time.
The hours of the last two weeks.
One calendar year, once a year.
Every game, every year, one number.
Steam has no page that adds them up. Paste your Steam profile address, custom name, or SteamID64 above, and the report adds the hours on record for every game in the library, shows the total as full work weeks, and then shows which games the hours went to.
No. The library and the profile's game list give hours on record one game at a time, and the profile's recent activity covers the last two weeks. Steam Replay covers a single calendar year. The all-time total has to be added up from the per-game hours, which is what this page does.
Whatever Steam has on record: the time each game in the library has been running, menus and idling included. Play from before Steam tracked hours is not in it. The report adds nothing of its own to Steam's numbers.
Steam has a privacy setting, "Always keep my total playtime private", that reports every game at zero minutes. The report says so instead of showing a zero. Your profile and game details also need to be public: in Steam, open Edit Profile, then Privacy Settings.
No account and no Steam sign-in are needed. The report is read-only and uses only what your Steam privacy settings already make public. No library is saved. Each game in it adds one to that game's counts across the libraries read here, and those counts hold no SteamID.
Steam Replay is Steam's own recap of one calendar year and arrives in December. This is every year at once: all the hours on record since the account was made, on any day you ask.
A read of the library on any day of the year, and monthly wraps once it is tracked.
What the same report says about the games you own and never launched.
Short games by the hours their players put in, with the ones you already own marked.