Media calculator
Video File Size Calculator
Estimate video size from duration plus video and audio bitrates, with clear decimal MB/GB results.
How this calculation works
Estimated size equals duration × combined bitrate ÷ 8. Container metadata and variable bitrate can make a real file slightly different, so the result is an estimate rather than a promised final size.
Good to know
Frequently asked questions
Why divide bitrate by eight?
Bitrate is normally stated in bits per second, while file size is measured in bytes. Eight bits make one byte.
Why can the real file be larger?
Containers add metadata and indexes, and variable-bitrate encoders may not hit their average target exactly.