Video file size
How Many MB Is a Video? File Sizes by Duration
Estimate how many MB a video uses from its length and bitrate, with reference tables for common settings and practical file-size checks.
Video size depends mainly on duration and total bitrate, not resolution alone. Multiply seconds by megabits per second, divide by eight to convert bits to bytes, then add audio. At 8 Mbps video plus 0.192 Mbps audio, a ten-minute file is about 614 MB before container overhead.
The quick calculation
Video size depends mainly on duration and total bitrate, not resolution alone. Multiply seconds by megabits per second, divide by eight to convert bits to bytes, then add audio. At 8 Mbps video plus 0.192 Mbps audio, a ten-minute file is about 614 MB before container overhead.
Video size reference table
| Duration | 5 Mbps | 10 Mbps | 20 Mbps |
|---|---|---|---|
| 1 minute | 37.5 MB | 75 MB | 150 MB |
| 10 minutes | 375 MB | 750 MB | 1.5 GB |
| 60 minutes | 2.25 GB | 4.5 GB | 9 GB |
These figures exclude audio and small container overheads. Add audio bitrate to video bitrate for a closer estimate.
Why two videos of the same length differ
A 1080p export can be smaller than a 720p export when it uses a lower bitrate or a more efficient codec. Frame rate, motion, encoder settings and audio also matter. Inspect the actual bitrate instead of estimating from the filename or resolution label.
Planning for an upload limit
Convert the platform limit to megabits, reserve a little room for audio and overhead, then divide by duration in seconds. Use two-pass or quality-targeted encoding when available, and check the exported file rather than assuming the encoder will hit an exact size.
Codec, bitrate mode and audio tracks
H.264, HEVC and AV1 can deliver different quality at the same bitrate, so a size estimate cannot predict picture quality. Constant bitrate is easier to forecast, while variable bitrate spends more data on complex scenes. Add every retained audio track, not only the default language.
For storage planning, multiply one finished file by the number of exports and allow room for source footage, proxies and revisions. Test a representative upload because platforms may transcode it into several delivery versions.
Quick answers
Frequently asked questions
How many MB is a one-minute video?
At 10 Mbps, one minute is about 75 MB before audio and overhead. A lower bitrate produces a smaller file.
Does 4K always create a larger file?
Usually, but not automatically. Bitrate and codec determine the stored data; resolution only influences the quality needed.
Why is my result different from the exported file?
Variable bitrate, audio tracks, metadata and container overhead can move the final size away from a simple estimate.
Should Mbps be divided by eight?
Yes. There are eight bits in a byte, so megabits per second must be divided by eight to estimate megabytes per second.
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