Back-of-envelope count of the videos in YouTube's library

How many videos are on YouTube? Build an estimate of the total, explain the structure you use, label each assumption, and finish with a number, a range and a check from a second direction. ```hint Stock or flow Decide first whether your number is a stock (everything on the platform now) or a flow (what arrives in a month). If you start from today's upload pace, ask whether that pace is a fair stand-in for every year since launch. ``` ### Clarifying Questions - Do Shorts and saved live streams count as videos, or only standard uploads? - Should private and unlisted videos be included, or only ones anyone can watch? - Is the target what is hosted today, or everything ever uploaded, including videos since deleted or taken down? ### What a Strong Answer Covers - A definition of what counts as a video and whether the total means hosted today or ever uploaded - An equation linking the total to quantities you can reason about, with each factor labeled as an assumption and given a reason - An explicit treatment of change over the platform's lifetime and of videos that are no longer on it - Correct arithmetic with consistent units (minutes, videos, years) - A cross-check by a second method, a final range, and the input that moves the answer most ### Follow-up Questions - Suppose you learn that the upload pace you used has since doubled. Which parts of your estimate change, and by how much? - How would you estimate what share of these videos have almost no views, and why would a product team want to know? - How would you adapt the method for a platform that hosts only short vertical clips?