What is the Video File Size Calculator?
Estimate encoded video data size by combining video and audio bitrates over time.
The result is a bitrate-based estimate and does not predict a specific codec quality level.
Formula and calculation method
bytes = duration seconds × (video bits/s + audio bits/s) ÷ 8.
The calculation runs locally in your browser and uses only the values entered on this page.
Important limitations
Technology estimates simplify real systems. Hardware, software, network conditions, measurement conventions and manufacturer behavior can change actual results.
Planning scope: Use the result as an estimate and confirm critical sizing or configuration with current product documentation.
Video File Size Calculator FAQs
Bitrate and duration directly determine this estimate; resolution influences the bitrate you may choose.
No. Enter an expected average bitrate for variable-bitrate media.
No. Containers, subtitles and extra tracks can add data.
No. Results are educational estimates based only on the values and simplifying assumptions entered.
Yes. A displayed result is hidden as soon as an input changes so an old answer is not mistaken for a current calculation.
Yes. The form, colorful result panel and calculation steps are responsive for phones, tablets and desktops.
Sources and methodology
Official source links support terminology and measurement context. The arithmetic runs locally in your browser.