Video Bitrate & File-Size Calculator

About Video Bitrate & File-Size Calculator

Compressing a video is mostly an arithmetic problem: bitrate times duration approximates file size. The AT USE Video Bitrate Calculator solves any direction. Plan a 30-minute export under 100 MB and the calculator tells you the maximum bitrate. Have a target bitrate and duration and need to know the file size — done. Audio bitrate is accounted for separately so the math reflects reality, with sensible defaults for stereo AAC at 128/192/256 kbps. Quick presets cover the most common destinations: YouTube SDR/HDR recommended bitrates, Twitter, Instagram Feed, Reels, and email-friendly attachments.

Common use cases

• Plan a video export to fit under a strict file-size cap (e.g. 25 MB email, 100 MB platform).
• Pick the right bitrate for YouTube based on resolution and frame rate.
• Estimate how long an HD video at a given bitrate will take to upload.
• Compare H.264 and H.265 budgets for the same target quality.
• Decide whether two-pass encoding is necessary based on bitrate budget.

How to use it

1. Pick which value you want the calculator to solve for.
2. Enter the two values you know.
3. Adjust audio bitrate and overhead if needed.
4. Read the answer and adjust until it fits your budget.

Frequently asked questions