a toolbox for the web.

Video Output File Size Calculator

To estimate the output size of your processed video file enter your target audio and video and duration values and hit calculate.

What is This tool?

It is an easy way to see what size your video file will likely be once it has been compressed.

I decided to make this video file size calculator as I could not find any tools online that did the job I needed to do myself. I use the video converter Handbrake to convert videos to a lower bitrate on a regular basis, for the web, which are uploaded to websites that have an upload limit.

Rather than guessing whether my compressed video would be smaller than upload limits I made this calculator.

To use it all you have to do is enter your target video bitrate (in Handbrake it is called average bitrate), likewise the audio bitrate and duration of your video file.

I chose to make this tool using bitrate rather than frame size e.g 1920x1080 because bitrate is what actually determines how big the output file will actually be. If you do two compressions of a video, one at 1920x1080 and one at 858 x 480 with the same bitrate, the files will be the same size.

I hope you find this tool useful :)

Video target bitrate recommendations

Bit rate (Mbps)*
2 – 5
5 – 10
10 – 20
20 – 30
30 – 60
50 – 80