How This Calculator Works
Use this video size tool for quick estimation, comparison, and planning intent while keeping formula assumptions visible.
Use the video file size calculator to estimate storage or upload size from video bitrate, audio bitrate, duration, and container overhead.
Bitrate tells how many megabits are stored each second. Dividing by 8 converts megabits to megabytes.
Formula
File size MB = (video Mbps + audio Mbps) x seconds / 8 x overhead factor.
Example Calculation
12 Mbps video plus 0.32 Mbps audio for 20 minutes is about 1.86 GB before platform recompression.
When to Use This Calculator
- Estimate upload size
- Plan storage
- Compare export bitrates
Practical Scenarios
- Use the Video File Size Calculator to estimate upload size while comparing at least one conservative and one higher-cost scenario.
- Use the Video File Size Calculator to plan storage while comparing at least one conservative and one higher-cost scenario.
- Use the Video File Size Calculator to compare export bitrates while comparing at least one conservative and one higher-cost scenario.
Tips
- Actual encoders use variable bitrates
- Platforms may recompress uploads
- Keep source files larger than delivery files
Common Mistakes
- Confusing megabits with megabytes
- Ignoring audio bitrate
- Assuming every codec has the same quality per bitrate
- Using a best-case input when a realistic range would be safer.
- Forgetting fees, taxes, inflation, usage changes, or other hidden costs where they apply.
Assumptions and Limitations
The Video File Size Calculator is most accurate when the inputs match current real-world numbers and when you review the formula, assumptions, and related calculators before acting.
- Provider pricing, runtime overhead, compression, caching, hardware limits, and production traffic can change final requirements.
- The result is a technical planning estimate, not a guarantee of performance or cost.
- Verify against current vendor documentation before committing to infrastructure or hardware.
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