Bitrate Calculator
Work out bitrate from file size and duration.
Bitrate from size and time
Bitrate is how many bits play per second, and it sets both quality and file size. Divide the size in bits by the duration in seconds: a 700 MB video over 45 minutes averages roughly 2.1 Mbps.
It works the other way for planning: if a platform requires video under a certain size, you can back into the maximum bitrate that fits your clip's length before you export.
Constant vs variable
Real files often use variable bitrate, so this gives the average rather than the peak. Your figures stay in the browser and are never uploaded.
Frequently Asked Questions
How does the bitrate calculator work?
Bitrate equals file size in bits divided by duration in seconds. A 500 MB file over 10 minutes averages about 6.67 Mbps.
When should I use this tool?
Use it for video exports, podcast files, livestream planning, download estimates, and storage budgeting.
What is the main limitation?
Container overhead and variable bitrate can make real files differ from the average.
Is this converter private?
Yes. It runs entirely in your browser, so your values are not uploaded or stored.
More free browser utilities for conversion, formatting, and technical cleanup.