That conversion is easy to do yet equally easy to overlook, and this is why many people fail to do it. So, before all else, we have to convert the data rate from megabits per second (Mbps) into megabytes per second (MBps). The video bitrates are measured in bits but file sizes in bytes. ![]() Just multiply the bitrate with the duration of the video, and you’re done. ![]() Knowing that makes calculating video file sizes pretty straightforward. Video bitrate is usually measured in megabits per second (Mbps), so it tells you exactly how many bits are written to the memory card each second. The higher the bitrate, the higher the image quality. The bitrate (sometimes also called the data rate) refers to the amount of information a video carries per unit of time. Hence, all these aspects are automatically factored in when the formula contains bitrate. Whenever you go from 30fps to 120fps, bitrate changes. Put simply, things like the number of frames, colors, and pixels determine the video bitrate. You just don’t have to deal with them individually when you use bitrate for your calculations. Why codec, frame rate, and resolution don’t matter when calculating video file sizes?Ĭodec, compression, frame rate, resolution, color sampling, and color bit depth absolutely do matter, and they all significantly affect the video file size. Once you understand it, you can easily apply it to other file formats, including audio and still images. Plus, there is additional value in knowing why this formula works. However, if you want to know why this simple formula works or how it can be accurate without factoring in frame rate, resolution, and color depth, then take a couple of minutes and read this article. Feel free to skip straight to the formula (below) and start punching in the numbers. It literally takes less than ten seconds, and all the initial data you need is bitrate and duration. Despite all the different codecs and picture quality settings, calculating video file sizes is a quick and easy process.
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