Video Bitrate & File Size Estimator
File size from bitrate, or the bitrate needed to hit a target size.
Mode
Duration
Audio bitrate (kbps)
Estimated size
3,686.4 MB
In gigabytes
3.686 GB
This is a container-overhead-free estimate — real exported files typically run slightly larger due to container and metadata overhead. That gap is expected, not an error in the math.
What is this tool?
Video file size is roughly (video bitrate + audio bitrate) × duration ÷ 8. This tool works in both directions: estimate the export file size from a chosen bitrate, or solve for the video bitrate needed to fit a target file size (the more commonly needed direction — 'I need this to fit in 500MB'). Results are a container-overhead-free estimate; real exported files typically run a little larger due to muxing and metadata.
How to use it
- Choose whether to estimate file size or required bitrate.
- Enter duration, and either video bitrate or a target file size.
- Pick an audio bitrate preset or enter a custom one.
Related design tools
- Color ConverterConvert between HEX, RGB, HSL, and HSB/HSV with a live swatch.
- CSS Gradient GeneratorBuild linear or radial gradients with multiple stops and copy CSS.
- CSS Box Shadow GeneratorTune offset, blur, spread, color, and layered shadows visually.
- CSS Border Radius GeneratorControl each corner’s radius and copy the CSS.