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Memory card capacity calculator

Roughly how many raw or JPEG frames fit on a card, or how much storage a shoot needs, from your file size per shot and the frames you plan.

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Example: 128. Decimal GB, as printed on the card.
About 25 MB per shot. File sizes are examples, not camera specs.
Optional margin for formatting overhead.
Example: 1,500. Gives the storage a shoot needs.
Example: 100. Use your camera's figure for the mode you shoot.
Optional.
Optional.
Shots that fit
5,120
Storage for the planned shots
37.5 GB1 card(s) of 128 GB
Video on this card
2 h 51 min45 GB per hour
Time to clear a full buffer
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Enter your camera's buffer depth and your card's write speed to estimate the buffer.

How it works

The method behind the numbers.

Card makers count in decimal units: 1 GB is 1,000,000,000 bytes and 1 MB is 1,000,000 bytes. The calculator uses the same, so the card size on the label goes straight in.

shots = floor(card GB × 10⁹ × (1 − reserve) ÷ (file MB × 10⁶)) recording time = card bytes × 8 ÷ (Mbps × 10⁶) buffer clear = depth × file MB ÷ write MB/s full-buffer rate = write MB/s ÷ file MB
  • The file sizes in the list are examples. Real files vary with scene detail, ISO, compression and file type, so shoot a few frames and use the size your camera actually writes.
  • Some computers report sizes in binary units (MiB, GiB), which read about 5% to 7% smaller than the decimal figure. Enter decimal MB to match the card label.
  • A formatted card shows a little less than its label, and some cameras keep space for their own use. Use the keep-free field if you want a margin.
  • Use the bitrate your camera lists for the video mode you shoot in; audio and metadata add a little. The buffer estimate needs your camera's buffer depth and the real write speed of your card, both of which you enter, since they vary by body and card.
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