To measure the size of your computer monitor, you can use a measuring tape or ruler. Start at the top-left corner of the screen and pull it diagonally to the bottom-right corner. Be sure to only measure the screen; do not include the bezel (the plastic edge) around the screen .
If you want to know more about measuring your computer monitor size, you can check out this [link](https://howchimp.com/what-size-is-my-monitor/) for more information.
I hope that helps! Let me know if you have any other questions.