Calculate video file sizes from duration, video bitrate (kbps), and audio bitrate.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Specify video length in minutes.
Choose video bitrate in kbps (or click 1080p / 4K preset).
Review calculated file size in Megabytes and Gigabytes.
YouTube recommends 6,000 to 8,000 kbps (6-8 Mbps) for 1080p 60fps video.
At 4.5 Mbps video + 192 kbps audio, a 15-minute video is approximately 527 MB.
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