Video File Size
Estimate video file size from resolution and duration
How to use Video File Size
- 1Enter the video duration, resolution, and target quality.
- 2Enter the codec and frame rate, or pick a preset.
- 3Read the estimated file size and adjust bitrate to fit your storage.
Estimating video file size
size = bitrate × duration; bitrate ≈ resolution × fps × qualityFactorVideo file size is driven mainly by bitrate and duration; resolution and frame rate set the bitrate needed for a given quality.
Modern codecs like H.265/HEVC and AV1 compress far better than older H.264 at the same perceived quality, shrinking files significantly.
Frequently asked questions
Does 4K quadruple the size of 1080p?
Not exactly; 4K has 4x pixels but efficient codecs and smart bitrate caps keep the increase smaller.
Which codec saves the most space?
AV1 and H.265 typically beat H.264 by 30–50% at equal quality.
Why is audio a small part of size?
Audio bitrates (128–320 kbps) are tiny next to video bitrates (several Mbps).