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Video Bitrate & File-Size Calculator

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Solve for bitrate, file size, or duration when you know any two — with audio bitrate included. Perfect for planning compressed exports.

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YouTube preset (video bitrate, kbps):

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

Is this tool free?

Yes. Completely free, no login, no watermark, no signup required. Everything runs in your browser.

Does it include audio?

Yes. Audio bitrate is configured separately, with presets for the common AAC bitrates.

Will it suggest YouTube-recommended bitrates?

Yes. Presets cover YouTube SDR and HDR for 1080p, 1440p, 4K, and 8K at 24-60 fps.

Will it support multiple audio tracks?

Yes. You can add multiple audio bitrates and the total budget updates live.

Does it account for container overhead?

A small overhead percentage is added by default. You can adjust it if you need a precise estimate.

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