Video bitrate calculator
Your files are processed on your device. We never upload them.
How to video bitrate calculator
- 01A ▸Choose what to work out. Bitrate, file size, or length.
- 02A ▸Enter the other two, and the audio bitrate (128 kbps is typical).
- 03A ▸Read the answer and the bitrate left for the picture.
Questions
How is the bitrate worked out?
Bitrate is size divided by length. A 25 MB file over 2 minutes is 25,000,000 bytes × 8 bits ÷ 120 seconds, which is 1,667 kbps in total. Audio and about 1% of container overhead come off that, and the rest is for the picture.
Does it use my video?
No. It's arithmetic on the numbers you type, worked out on this page. No file is opened.
Is 1 MB 1,000,000 bytes or 1,048,576?
This calculator uses 1,000,000, as upload limits and video tools usually mean. If a limit is in MiB, multiply it by 1.05 before entering it.
How do I fit a video under a size limit?
Choose Bitrate, enter the limit a little below the real one (say 24 MB for 25 MB) and the video's length, and use the video bitrate it gives when you export. If the video bitrate is very low, shorten the video or lower its resolution.
What bitrate looks good?
As a rough guide for H.264, 720p needs about 2,500 to 5,000 kbps, and 1080p about 5,000 to 8,000 kbps. Newer formats such as H.265 and AV1 look as good at about half that.
Can I type minutes?
Yes. Enter the length as seconds (90), minutes and seconds (1:30), or hours, minutes, and seconds (1:01:30).