Video File Size Calculator

Estimate video storage from video bitrate, audio bitrate, and running time using decimal gigabytes and binary gibibytes.

Video bitrateNumber from 0 to 1000000 Mbit/s.Audio bitrateNumber from 0 to 1000000 kbit/s.HoursWhole number from 0 to 100000.MinutesWhole number from 0 to 59.SecondsNumber from 0 to 59.999.

Use consistent units exactly as labeled. Decimal and scientific notation are accepted for non-integer fields; blanks, commas, fractions and non-finite entries are rejected.

Calculate

Total bitrate8.192 Mbit/s

Duration5400 sec

Estimated file size5.5296 GB

Estimated file size5.149841309 GiB

The displayed results apply to the default example. Enable JavaScript to calculate other inputs.

How to use this calculator

1. Replace the example values with your own measurements, schedule, prices, or media settings.
2. Keep each value in the unit printed beside its field.
3. Select Calculate and review every result together with the assumptions below.

Formula and method

Bytes = (video Mbit/s × 1,000,000 + audio kbit/s × 1,000) × seconds ÷ 8. GB uses 10⁹ bytes; GiB uses 2³⁰ bytes.

Calculations run in your browser. Results are hidden whenever an input changes or validation fails, preventing an old answer from being mistaken for the current calculation.

Worked example

Video bitrate = 8 Mbit/s; Audio bitrate = 192 kbit/s; Hours = 1; Minutes = 30; Seconds = 0. The calculator returns Total bitrate = 8.192 Mbit/s; Duration = 5400 sec; Estimated file size = 5.5296 GB; Estimated file size = 5.149841309 GiB.

The worked example uses the same default values shown in the interface, so the displayed result and explanation can be checked directly.

Limitations

Variable bitrate, container overhead, metadata, multiple tracks and encoder behavior can change the final file. Treat the result as a planning estimate.

Use the result as a planning estimate. Confirm prices, policies, equipment ratings, units and professional requirements that apply to your situation.

Frequently asked questions

Why are GB and GiB different?

A decimal gigabyte is 1,000,000,000 bytes; a gibibyte is 1,073,741,824 bytes.

Why does the calculator reject my entry?

Each field shows its supported range. Whole-number fields reject decimals, and all fields reject blanks, words, comma-formatted numbers, fractions and non-finite values.

How should I round the result?

Keep extra digits while planning, then round to the precision supported by your inputs, package sizes, billing rules or equipment settings.

Review notes and reference

Reviewed October 4, 2026. The formula was checked against the displayed worked example. The script was tested for defaults, field boundaries, invalid formats, condition-specific errors and recovery after an error. Reference: NIST guidance on bits, bytes, and binary prefixes. Explanations and examples are original.

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