Video File Size Calculator
File Size (MB)
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File Size (GB)
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How to Estimate Video File Size
File size equals total bitrate multiplied by duration divided by 8. Formula: File Size (MB) = (Video Mbps + Audio Mbps) x seconds / 8.
Typical bitrates: 720p at 5 Mbps, 1080p at 8 Mbps, 4K at 35 Mbps. H.265 achieves similar quality at roughly half the bitrate of H.264.
Audio adds a consistent amount. Stereo at 192 kbps adds about 1.4 MB per minute.
Frequently Asked Questions
What bitrate for YouTube?
YouTube recommends 8 Mbps for 1080p SDR, 35-45 Mbps for 4K SDR.
How much storage for 1 hour of 4K?
At 35 Mbps, about 15.75 GB. At 100 Mbps (high quality), about 45 GB.
Does frame rate affect file size?
Higher frame rates increase data. Doubling fps at the same per-frame quality roughly doubles file size.
What is CBR vs VBR?
CBR uses fixed bitrate throughout. VBR adapts to scene complexity, generally producing better quality at the same average size.