Video File Size Estimator
Estimate how large an export will be from its bitrate and duration.
This is an estimate assuming a constant average bitrate. Variable-bitrate (VBR) encodes will vary with content complexity.
Frequently asked questions
File size equals total bitrate multiplied by duration. In bytes: (video Mbps × 1,000,000 + audio kbps × 1,000) × seconds ÷ 8. This tool does the conversion and shows the result in MB or GB.
As a rough guide, 8 Mbps suits 1080p, 16–20 Mbps suits 1440p, and 35–45 Mbps suits 4K. Higher bitrates preserve more detail but produce larger files.
This estimate assumes a constant average bitrate. Variable-bitrate (VBR) encodes allocate more data to complex scenes and less to simple ones, so the real size varies with content.
It uses decimal units (1 MB = 1,000,000 bytes), which matches how bitrates and storage are usually advertised.