Video Duration from File Size Calculator
Works out how long a recording fits in the space you have.
Recording length
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
In other units —
Total bitrate — Mbit/s
The formula
length = size × 8 ÷ (video bitrate + audio bitrate)
Cards hold slightly less than their label once formatted.
What to watch out for
Camera manuals list the bitrate of each recording mode.
Frequently Asked Questions
How long does 64 GB last at 50 Mbit/s?
About 2 h 50 min 1 s.