Video Bitrate Calculator
Work out the video bitrate that makes a file fit a target size (MB or GB), or the final file size from a bitrate, with the recommended range for each resolution and frame rate, codec adjustment (H.264, H.265, AV1) and a ready-made FFmpeg command.
How to useThe right bitrate for your video
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Video Bitrate Calculator: what it is for
Enter the video duration and the size the file must have (for example a website's or app's upload limit) and see the video bitrate to use, with the audio and container overhead already subtracted. Or go the other way: enter the bitrate and see the final size and how much it takes per minute. The tool compares the result with the recommended range for the resolution (480p to 4K, 30 or 60 fps) and codec (H.264, H.265/VP9 or AV1) and builds the two-pass FFmpeg command.
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Everything runs in your browser: nothing you paste or open is sent to a server.
How to use
- Choose what to calculate and the resolution.
- Enter the duration and the size or the bitrate.
- Copy the FFmpeg command.
When to use it
- Make a video fit an upload limit.
- Pick the export bitrate in your editor.
- Estimate the storage for long recordings.
Frequently asked questions
What is bitrate?
It is the amount of data used per second of video, usually in kbps (kilobits per second) or Mbps. Higher bitrate means more detail and a bigger file. File size = total bitrate × duration ÷ 8.
How do I make a video fit a maximum size?
Choose "Bitrate for a file size", enter the duration, the target size and the audio bitrate. The tool subtracts the audio and a small container margin and shows the video bitrate to use, plus a two-pass FFmpeg command that hits the size.
What bitrate should I use for 1080p?
With H.264, 4.5–8 Mbps at 30 fps and 7–12 Mbps at 60 fps, in line with YouTube's upload recommendations. Scenes with lots of motion need the top of the range.
Why do H.265 and AV1 need less bitrate?
They are more efficient codecs: with about 40% (H.265/VP9) to 50% (AV1) less data they deliver quality similar to H.264. In exchange they take longer to encode and some older devices cannot play them.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 are free.