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Browser utility · output first
Video File Size Calculator
Estimate an encoded video file size from duration and bitrate before you export or upload.
Inputs
Duration and video/audio bitrate. Values stay in this browser.
Result
Estimated megabytes and gigabytes with the formula shown
Enter the inputs and calculate to see a result.
All calculations run locally in the browser.
No source media is uploaded by these calculators. A selected file is used only for local metadata inspection.
- All calculations run locally in the browser.
- All calculations run locally in the browser.
- All calculations run locally in the browser.
Updated 2026-08-04
Frequently asked questions
Is the result exact?
No. Container overhead, variable bitrate, audio, and metadata can change the final file size.
Which bitrate should I enter?
Use the target average bitrate in Mbps from your encoder or export preset.
Browser utility · output first
All calculations run locally in the browser.