When to use this calculator
An average bitrate is more useful than peak bitrate for predicting the final size of variable-bitrate video.
Explore the image, audio & video calculators for other questions in this topic. For a related calculation, use the Availability Downtime Calculator: Translate an availability percentage into downtime over a chosen period.
PUTTING IT INTO PRACTICE
Video File Size: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Average bitrate (Mbps) | 8 |
| Duration (minutes) | 10 |
| Result | 600 MB |
- Check the input labels and enter the example values above.
- Apply the relationship: Size in decimal MB = bitrate × minutes × 60/8.
- The result is 600 MB, rounded for display.
How to interpret your result
Add audio and container overhead if they are not included in the average bitrate.
Uncompressed pixel and PCM estimates use a predictable data layout. Compressed media sizes depend on codec and content. Average encoded bitrate can estimate file size but does not by itself establish quality.
Frequently asked questions
Will an uncompressed image estimate match a JPEG file?
Usually not. JPEG uses compression, so its final size depends on the image and encoding settings.
When is the video file size calculator useful?
An average bitrate is more useful than peak bitrate for predicting the final size of variable-bitrate video.
How do I use the video file size calculator?
Enter average bitrate (mbps), duration (minutes). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Size in decimal MB = bitrate × minutes × 60/8.
What should I check before using the result?
Add audio and container overhead if they are not included in the average bitrate.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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