Media Production ToolsStart from the question you are trying to answer. Every calculator states its formula on its own page, so a result can be checked by hand.
Three points in one job, with the numbers computed by the same engine the calculators use. Each link opens the calculator with the scenario already filled in.
A 64 GB card recording 100 Mbps video with a 128 Kbps audio track holds 1 h 25 min 13 s of continuous footage — 1:25:13 on the clock. A six-hour day at that setting needs four cards, and that is before any reserve for the card you would rather not fill to the last byte.
A twelve-minute cut that must arrive under 2 GB leaves 22.094 Mbps for the picture once a 128 Kbps audio track is accounted for. Set the encoder a little below that if the limit is enforced rather than advisory, because a variable-bitrate encode targets an average rather than a ceiling.
An 8 GB master over a 25 Mbps upload takes 42 min 40 s at the full advertised speed, and longer in practice. If you have measured your real throughput, enter it as the efficiency and the estimate moves with it.
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