Video File Size Calculator
Estimate the file size of a video from its bitrate and duration, useful for storage and upload planning.
Your results
Calculation breakdown
- Total bitrate
- video bitrate + audio bitrate
- File size
- (total bitrate × duration in seconds) ÷ 8
Worked example
A 10-minute video at 12 Mbps video plus 192 kbps audio produces roughly (12,192,000 × 600) ÷ 8 ≈ 914 MB.
Assumptions
- Assumes a constant bitrate; variable bitrate encoding will differ.
- Ignores small container/metadata overhead.
- 1 GB is treated as 1,000 MB (decimal).
How this calculator works
Calculate expected video file size from bitrate and length. Handy for estimating how much storage a recording will need or how long it will take to upload or download.
Frequently asked questions
What bitrate should I use for the estimate?
Check your camera or recording software's settings; common values are 8–20 Mbps for 1080p and 35–100 Mbps for 4K.
Does audio affect the file size?
Yes, this estimate can include an audio bitrate component; audio typically adds only a small amount compared with video.
Why is my actual file a different size?
Variable bitrate encoding, scene complexity and compression settings mean real files can differ from a constant-bitrate estimate.
Editorial review and responsibility
Reviewed by the CalcAussie editorial team on 21 September 2026. Review scope: Method, Australian terminology, material assumptions, source links and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.