Add the requested inputs
Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.
Digital & media · Free online tool
File size estimator
Estimate audio or video file size from bitrate and duration.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
File size estimator workspace
Runs locally in your browser
Result
Estimated size—
Decimal MB—
Binary MiB—
Decimal GB—
Binary GiB—
Bytes—
Use it with confidence
How to use the file size estimator.
Calculate and review
Use the main action when needed. Bytes = bitrate in bits per second × seconds ÷ 8, then displayed in decimal MB and binary MiB.
Try a worked example
A 10 Mbps video lasting 60 seconds is about 75 MB before container overhead.
Check the assumptions
Variable bitrate, multiple tracks, metadata and codec behaviour make final files differ.
Helpful answers
File size estimator FAQs.
Is the file size estimator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this file size estimator work?
Bytes = bitrate in bits per second × seconds ÷ 8, then displayed in decimal MB and binary MiB.
What should I check before using the result?
Variable bitrate, multiple tracks, metadata and codec behaviour make final files differ.