Video and Audio File Size Calculator
Estimate media file size from duration and average audio/video bitrates, or solve the video bitrate available under a file-size limit.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Add average stream bitrates, multiply by playback seconds and divide by eight for bytes. Apply the entered extra container percentage. For a file-size limit, remove overhead and audio before solving the video budget.
bytes=(video bit/s+audio bit/s)×seconds×(1+overhead/100)/8
Worked example
Ten minutes at 8 Mbit/s video and 192 kbit/s audio uses 614.4 MB before container overhead. A 500 MB limit for the same duration/audio leaves about 6.474667 Mbit/s for video.
Assumptions and input details
Use average bitrates, including all audio tracks. Bitrate is not frame rate, resolution or a guarantee of visual quality. Overhead is an entered estimate (0–100% of combined stream bytes); subtitles, metadata and variable encoding behaviour are included only if reflected in inputs. Duration is positive up to 1e9 seconds; rates are nonnegative up to 1e15 bit/s. Decimal MB and binary MiB are distinct. This estimates encoded media size, not transfer time or uncompressed pixel storage.
References: FFmpeg bitrate options · NIST binary prefixes
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
One byte is eight bits. Decimal prefixes (k, M, G, T, P, E) use powers of 1000. Binary prefixes (Ki, Mi, Gi, Ti, Pi, Ei) use powers of 1024. Transfer rates are per second.
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
Find transfer time, required nominal speed or data size. Distinguish bits, bytes, decimal and binary units and include an explicit effective-throughput percentage.
Convert pixel dimensions, print dimensions and pixels per inch. Find physical print size, required whole pixels or effective image resolution.
Add or subtract up to 100 durations. Use signed clock durations or decimal hours, minutes or seconds, then compare the exact total and running sums.
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