Video Bitrate for a Target File Size
Find the video bitrate to use so a clip of a given length fits a target file size, free online.
About this calculator
Total bitrate = file size × 8 ÷ duration. Subtract the audio bitrate to get the video bitrate. For example 700 MB for a 90-minute film is about 1,037 kbps in total. Leave a few percent for container overhead.