Free Video Tools
Video File-size Calculator
Estimate final video storage from duration plus average video and audio bitrates.
What this tool does
Estimate storage from encoded duration and bitrate.
The calculator combines average video bitrate with audio bitrate, multiplies by duration, and converts the result from bits to megabytes and gigabytes.
It is an estimate because containers, extra tracks, metadata, and variable-bitrate encoding add variation.
Use the tool
Estimate a video file size
Enter duration plus average video and audio bitrates to calculate approximate storage.
Duration and encoded bitrate
Estimate storage or transfer size from the final video and audio bitrates.
Estimated file size
228.6 MB
- Combined bitrate
- 12.192 Mbps
- Duration
- 150 seconds
Approximation excludes container overhead, variable-bitrate variation, extra audio tracks, captions, and metadata.
How to use it
Three quick steps
- 1Enter the final duration in minutes and seconds.
- 2Add the planned average video bitrate and audio bitrate.
- 3Use the estimate for transfer planning, then measure the actual encoded file.
Worked example
Estimate a two-and-a-half-minute master
Use 12 Mbps video and 192 kbps audio for a 2:30 duration.
FAQ
Questions about the video file-size calculator
Practical details about using the tool and understanding its result.
Keep working
Related tools
Video Bitrate Calculator
Calculate the average video bitrate available inside a target file-size limit.
Open toolTimecode Calculator
Convert non-drop-frame timecode into total frames at common production frame rates.
Open toolVoice-over Script Timer
Estimate spoken duration from a script’s word count and an adjustable reading pace.
Open toolFrom one asset to the whole workflow
Keep technical delivery requirements beside the approved video master.
Draftroom keeps projects, creative files, feedback, revisions, and approvals connected in one workspace.