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Video size & bitrate calculator

Two quick answers: how big your recording is, and what it takes to fit a limit.

Fit a size limit

Video bitrate to aim for
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Email targets leave headroom because attachments grow by about a third when they're encoded for sending. Assumes 96 kbps audio and 4% container overhead.

How big is my recording?

Approximate file size
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Based on the per-minute estimates Apple shows in Settings › Camera › Record Video. Real files vary with motion and lighting.

How the numbers work

File size is just bitrate × length. To fit a limit, take the target size in bits, subtract the audio, and divide by the number of seconds. If the bitrate that leaves is low, dropping resolution keeps the picture sharp instead of blocky — that's why a 5-minute video for email usually needs to go to 720p or below.