Video size calculator

Aimed at editors and producers, it estimates required bitrate and final file size for a given video duration and settings.

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About This Tool

This tool estimates the required bitrate and final file size for a video based on duration and chosen encoding parameters. It helps editors, producers, and streaming planners assess storage needs and bandwidth requirements before encoding. It supports inputs in seconds or minutes and outputs in MB or GB, with options to specify video and audio bitrates separately or as a total. The approach stays focused on planning, not actual encoder behavior.
Conceptually, the tool treats the video as a single bitrate stream and translates duration and target size into a bitrate value, then derives the corresponding file size when a bitrate is known. This supports decision-making during asset planning, delivery budgeting, or platform constraint checks.
Key value lies in quickly comparing presets, estimating storage implications, and aligning encoding choices with delivery SLAs. Core features include input validation, unit normalization, and clear numeric outputs formatted to two decimals. Use cases include preparing a short film for streaming within a 500 MB cap or sizing a multi‑hour asset for archival storage.
The tool emphasizes speed, precision, and interoperability with other planning tools, providing reproducible estimates that can be exported or saved for later iteration.

How to Use

  1. Provide inputs: duration (seconds or minutes), and either target size or total bitrate.
  2. Optionally set audio bitrate, fps, and separate video/audio components.
  3. Choose calculation mode: compute required bitrate from target size or estimate total size from bitrate and duration.
  4. Run calculation to view outputs, including total size and component contributions.
  5. Adjust inputs to meet delivery constraints and re-run as needed.
How to use video converter size online

Frequently Asked Questions

Find Quick Answers

What assumptions does this tool make?
The tool assumes constant bitrate (CBR) across the entire duration and ignores encoder overhead and container metadata. Results are planning estimates intended for budgeting storage and bandwidth, not exact encoding outcomes. Real-world results may vary with scene complexity and encoder settings.
Can I input duration in minutes?
Yes. The tool accepts duration in minutes or seconds. If you provide minutes, the system converts to seconds for the calculation, then presents results in standard units. This helps when you have longer-form content or a quick planning impulse.
How are MB and GB defined?
Megabytes and gigabytes use binary units: 1 MB = 1024 × 1024 bytes, 1 GB = 1024 MB. The calculator converts those to bits for bitrate calculations and formats outputs to two decimals for clarity.
Does it separate audio and video bitrate?
Yes. You can specify either a total bitrate or separate video and audio bitrates. The tool computes the total size from the combined bitrate or derives the required bitrate from a target size, then shows the contribution of each component when provided.

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