FREE VIDEO WORKFLOW TOOLS
Video file size calculator
Estimate download size from runtime and separate video and audio bitrates.
Free · no sign-up · no model calls. Your input stays in browser memory. Combined input limit: 1 MiB UTF-8 text.
Size = seconds × combined bitrate ÷ 8. MB and MiB use different units. Variable bitrate, metadata and container overhead can change the actual file size; this does not inspect or encode video.
How to use it
- Enter your own input, or load the labelled example.
- Run the tool and review its complete result and limitations.
- Download the draft or report, then check it in your intended workflow.
What to check
Size = seconds × combined bitrate ÷ 8. MB and MiB use different units. Variable bitrate, metadata and container overhead can change the actual file size; this does not inspect or encode video.
Continue your video project
Your result is available above without registering. To organize a brief, script and source records in Topicut, start a project. Public video generation is not open yet.
Related free tools
Learn the terms in the video glossary, or follow a workflow guide.
Free deterministic tool · updated October 29, 2026.