Need to email a clip under 25 MB, or fit a video on a drive? File size comes down to bitrate × duration. This free video size calculator estimates the final size from your bitrate and length, or tells you the bitrate to hit a target size — no guesswork before you export.
Estimated file size at 10 Mbps for 1m 0s
Enter your values
See the result update instantly
Use it to plan or resize your video
Roughly: file size ≈ bitrate × duration. A higher bitrate or a longer video means a larger file. This tool does the conversion between megabits and megabytes for you.
For 1080p, 8–12 Mbps looks great; for 720p, 5–7.5 Mbps; for 4K, 35–45 Mbps. Lower it to shrink the file, raise it for more quality.
Lower the bitrate or resolution, or shorten the clip. To compress without the math, use our free Video Compressor.
Yes — it is 100% free, runs in your browser, and needs no account.
Free, fast tools to compress, convert, trim and clean up your videos — no sign-up.