Video Bitrate From Size Calculator

Summary

Enter your target file size and video duration to get the total bitrate, then split it between video and audio.

How it works

1. Enter your target file size in MB or GB.
2. Set the video duration in hours, minutes, and seconds.
3. Pick an audio bitrate from the presets (or enter a custom value).
4. The calculator subtracts audio overhead and returns the remaining video bitrate.
5. Read the total, video, and audio bitrates plus an overhead summary.
6. Adjust any input live — results update instantly.

Use cases

• Fitting a video inside a platform upload limit (Discord, WhatsApp, email attachment).
• Encoding to a fixed-size delivery format like a Blu-ray tier or streaming tier.
• Verifying that a target encode preset will stay under a storage quota.
• Estimating the maximum quality achievable for a given file-size budget.
• Planning multi-pass H.264/H.265 encodes where you specify a target size.
• Confirming audio bitrate headroom before committing to a video encode.

Frequently Asked Questions