Watch hours are views times how long people watched
Take the views and the average view duration. Turn that duration into seconds, multiply by the views, and divide by 3,600, the number of seconds in an hour. Twelve thousand views at 4:30 is 3,240,000 seconds, which is 900 hours. That example is the arithmetic, not a typical channel.
The watch time calculator does this from numbers you type and prints the equation. It does not open YouTube Studio.
Use the duration Studio shows, not the length of the file
Average view duration is how long a view lasted. A ten-minute video that people leave after a minute has an average view duration near 1:00, not 10:00. Analytics in YouTube Studio is where that figure lives. Average percentage viewed is the same duration divided by the video's length.
If you have the length and the percentage, multiply them to get the duration, then use the formula above. The calculator has a field for that. If Studio already shows watch time for the video, copy that number. Do not replace it with a fresh estimate.
A sum of a few videos is not the partner-program total
You can add several uploads to see what those view counts imply together. YouTube's long-form requirement is qualified watch hours over a rolling year, not the last video you remember. Private, unlisted, deleted, and Shorts watch time are not something this page can sort for you.
The count YouTube is using is on the Earn page in Studio. Shorts views vs watch hours explains why those paths stay separate. How to get 4,000 watch hours is about the videos, not the multiplication.
The hours do not rewrite a title
A clearer title and a next video people actually start are what change the duration and the views. The free mini-audit names three public metadata fixes. It cannot see watch time.
Paid plans keep the written YouTube fixes. Pro is $9 a month, Growth is $19, and Unlimited is $39. Unlimited can read watch time from YouTube Analytics after you connect it. The calculator stays free either way.
Questions
What is the formula for YouTube watch hours?
Views times average view duration in seconds, divided by 3,600. A duration of 4:30 is 270 seconds.
Is average view duration the same as the video length?
No. Length is how long the file is. Average view duration is how long people watched. Use the duration from YouTube Studio.
Can this calculation see my channel?
No. It only uses the numbers you type. YouTube Studio's Earn page is the watch time that counts for the partner program.