Video File Size Calculator
Need to check if a video will fit on your storage? This calculator multiplies your stream or recording bitrate by its duration to approximate the resulting file size in megabytes. Provide the average bitrate in megabits per second and the runtime in minutes to plan storage or upload budgets.
Estimate only; encoding settings can change size.
Examples
- 5 Mbps stream lasting 10 minutes ⇒ 375 MB
- 8 Mbps recording lasting 60 minutes ⇒ 3,600 MB (≈3.52 GB)
- 12 Mbps webinar lasting 45 minutes ⇒ 4,050 MB (≈3.96 GB)
FAQ
What does bitrate mean?
Bitrate is the amount of data encoded per second; higher bitrates usually mean better quality but larger files.
How do I convert the result to gigabytes?
Divide the megabyte result by 1,024 to express it in gigabytes.
Does the calculation include audio and metadata overhead?
It assumes the stated bitrate already includes audio; actual files may be slightly larger due to container overhead.
Why is the bitrate divided by 8 in the formula?
Bitrate is in megabits per second and there are eight bits in a byte, so dividing by 8 converts bits to bytes.
Additional Information
- File size (MB) = bitrate (Mbps) × duration (minutes) × 60 ÷ 8.
- Use the average bitrate from your encoder or streaming software, not the peak bitrate.
- Consider variable bitrate (VBR) fluctuations, which can cause files to be larger than this constant-rate estimate.