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kbps
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Video File Size Calculator
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This Video File Size Calculator estimates the resulting file size of a video from its duration, video bitrate, and audio bitrate — the same math video editing software uses internally when you set an export bitrate. Enter your video's length in minutes, the video bitrate in Mbps, and the audio bitrate in kbps, and get an instant estimate in both MB and GB. It's useful for planning storage space, checking whether a video will fit an upload limit, or estimating bandwidth needs before exporting. Everything runs locally in your browser. Scroll down to enter your video's settings.
Features
- Estimates file size from duration and bitrate
- Accounts for both video and audio bitrate
- Shows results in both MB and GB
- Instant recalculation as you adjust inputs
Why use this video file size calculator?
- Plan storage and upload limits before exporting
- No manual bitrate math required
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
How is video file size calculated from bitrate?
File size equals total bitrate (video + audio, in bits per second) multiplied by duration in seconds, then converted from bits to bytes (÷8) and to megabytes.
What video bitrate should I use for good quality?
This varies by resolution — roughly 5-8 Mbps for 1080p, 16-40 Mbps for 4K is common for reasonable quality, though platform-specific recommendations (like YouTube's) may differ.
Does this account for variable bitrate (VBR) encoding?
No, it assumes a constant average bitrate; VBR encoding fluctuates the bitrate based on scene complexity, so actual file size may differ somewhat from this estimate.
Can I use this to hit a target file size for uploading?
Yes, work backward: divide your target file size by the duration to find the total bitrate budget, then split that between video and audio bitrate.
Does container format (MP4, MOV, etc.) affect the result?
Container overhead is minimal and not included here; the estimate reflects the actual encoded video/audio data, which dominates file size.