Estimate video file size from duration, resolution, FPS, video bitrate and audio bitrate.
Estimate video file size from duration, resolution, FPS, video bitrate and audio bitrate.
Video file size is mainly determined by bitrate and duration. A simple estimate is the total bitrate multiplied by the duration, then converted from bits to bytes. This calculator combines the video and audio bitrates to give you a practical estimate before an export or upload.
For example, a 20 Mbps video bitrate plus 192 kbps audio over five minutes produces an approximate file size of 0.76 GB in decimal units. The actual exported file can be different because codecs, containers, variable bitrate encoding and metadata affect the final result.
Resolution describes how many pixels are stored in every frame, while frame rate describes how many frames are shown every second. Higher resolutions such as 4K contain more pixels than Full HD, and higher frame rates can require more data when the bitrate is increased to preserve quality.
The presets include common 720p, 1080p, 1440p, 4K and 8K workflows, with typical 24, 25, 30 and 60 fps settings. Use them as starting points, then adjust the bitrate to match your codec, quality target or delivery specification.
No. This is a planning calculator rather than a codec simulator. A constant-bitrate export will usually be close to the calculated value, while variable-bitrate encoding can produce a noticeably different final size. Always check the final exported file for delivery-critical work.
Resolution Calculator · Aspect Ratio Calculator · Frames & Duration Calculator