Video File Size Calculator
Know a video's bitrate and length but not its size? Enter both here. The tool multiplies them and shows how much the file will weigh in MB or GB.
Enter a length and a bitrate to see the size.
Bitrate is bits per second, so the result divides by 8 to reach bytes. This covers the main stream. A real file runs a little larger with audio and container overhead.
How It Works
Enter the video length and pick a time unit. Then enter the bitrate in Mbps or kbps. The size appears as you type.
Bitrate is bits per second. Multiply it by the number of seconds to get total bits, then divide by 8 to get bytes.
This estimates the video stream. A real file adds a little for audio and container overhead, so treat the figure as a close estimate.
The Formula
An 8 Mbps bitrate is 8,000,000 bits every second.
Over 10 minutes, that is 600 seconds, so 8,000,000 times 600 is 4,800,000,000 bits.
Divide by 8 for bytes: 600,000,000 bytes, which is 600 MB.
Worked Example
You are exporting a 10 minute clip at a bitrate of 8 Mbps.
10 minutes is 600 seconds. 8 Mbps times 600 is 4,800,000,000 bits.
Divide by 8 and you get 600,000,000 bytes, or 600 MB for the video stream.
Common Uses
- Checking a render size before you export from an editor.
- Seeing if a clip will fit an upload or attachment limit.
- Comparing how bitrate choices change the final file size.
- Estimating storage for a batch of clips at the same bitrate.