Video File Size Calculator
MP4, MOV, WebM size from bitrate + duration
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Video file size calculator
MP4, MOV, WebM sizes from bitrate + duration. Codec-aware.
How to use this tool
- 1
Enter video specs
Duration, resolution, frame rate.
- 2
Pick codec
H.264, H.265, AV1, or VP9.
- 3
See file size
Plus upload time + CDN bandwidth cost.
Frequently Asked Questions
Which codec gives smallest files?
AV1 (best compression, slow encode). H.265/HEVC (great, patent issues). VP9 (open, good). H.264 (universal, older, larger). For delivery: AV1 saves ~30-50% vs H.264.
Bitrate rule of thumb?
1080p30 web delivery: 5-8 Mbps. 4K: 25-50 Mbps. 8K: 80-150 Mbps. For archival (high quality): 2-4× these numbers. For streaming: stick to low end.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.