How to calculate YouTube playlist length (total watch time)

To get an accurate total for a public playlist, copy its URL from the browser address bar or use a watch URL that still contains the list= parameter. The list ID is what the YouTube Data API uses to enumerate items in order.

Paste the URL into the calculator and submit. The app requests playlist items, resolves each video’s duration, and sums seconds for every item in the current page of results according to your optional From and To range.

If a video was removed, is region-restricted, or is otherwise unavailable to the API, it may be skipped—so your total reflects what the API can see, not necessarily every thumbnail you remember from the playlist page.

Use the playback speed list after a successful calculation to compare full catalog length with how long a session would take at 1.25×, 1.5×, or 2× without changing the underlying playlist duration.