Free tool
Bitrate, file size and storage calculator
Work out how big an export will be, what bitrate hits a size limit, and how much card and drive space a shoot needs. Camera codecs included.
Minutes and seconds, or hours:minutes:seconds
Megabits per second
Kilobits per second
Doubles the storage, the way a sane backup does
Estimated file size
0 MB
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Bits, bytes and why the numbers look wrong
Bitrates are quoted in megabits per second and file sizes in megabytes, and there are eight bits in a byte. A 20 Mbps export is therefore 2.5 MB of file for every second of video. Miss that and your estimate is out by a factor of eight, which is the single most common mistake in delivery planning.
These are estimates, and where they drift
Intra-frame codecs like ProRes and DNxHR hold a near constant rate, so the numbers here land close. Long-GOP codecs such as H.264 and H.265 vary with the footage: a locked-off interview compresses far smaller than handheld grass in wind. Treat variable bitrate exports as a range, not a promise.
Always plan for two copies
Footage that exists in one place does not exist. Budget for the card, the working drive and the backup before the shoot, not after. The second copy toggle above doubles the estimate because that is the number that actually goes on the kit list.