Video Bitrate Calculator
Work out a video’s file size from its bitrate.
Result
Estimated file sizeExample
- Video part
- 375 MB
- Audio part
- 9.6 MB
- Total bitrate
- 5,128 kbps (5.13 Mbps)
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- 5,128 kbps × 1,000 × 600 s ÷ 8 = 384,600,000 bytes
Containers add 1 to 2%; encodes land near the average.
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Questions
How is video file size calculated?
File size is bitrate times duration, divided by 8 to turn bits into bytes. Ten minutes at 5,000 kbps of video plus 128 kbps of audio is 5,128 × 1,000 × 600 ÷ 8 = about 385 MB.
What bitrate fits a 25 MB limit?
Choose “Bitrate for a size”, enter 25 MB and the length. A one-minute clip gets about 3,300 kbps in total; after 128 kbps of audio and a little room for the container, use about 3,100 kbps for the video.
What’s the difference between kbps and KB/s?
Bitrates are in kilobits per second (kbps); file sizes are in bytes. There are 8 bits in a byte, so 8,000 kbps is 1,000 KB/s, or 1 MB every second.
Why is my real file a different size?
Most encoders use a variable bitrate that averages out near the target rather than exactly on it, and the container (MP4, MKV) adds a small overhead, usually 1 to 2%. Two-pass encoding lands closest to a target size.
Is it free? Do I need an account?
It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.
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