Memory Card Capacity Calculator

Card capacity, GB

Photo format

Video bitrate, Mbps

Share of the card for stills, %

Result

Photographs1,088
Minutes of video41
Stills only2,176
Video only, minutes81
Usable capacity, GB59.52
Size of one photo24 MP RAW — 28 MB

Usable space is less than the label

Works out how many photographs and minutes of video fit on a memory card at your chosen format and bitrate.

A 64-gigabyte card holds about 59.5 gigabytes of usable space: the manufacturer counts a gigabyte as a billion bytes while the file system counts 2³⁰, and some goes to housekeeping structures. The gap is around seven percent, and on large cards it shows.

After that it is all format. One RAW from a 24-megapixel camera runs about 28 megabytes, a JPEG of the same frame about eight, and a minute of video at 100 megabits a second takes 750 megabytes. Video eats a card many times faster than stills.

What this calculator shows

Photographs and minutes of video at your chosen split of the card
The totals for stills only and for video only
The usable capacity after formatting

What to keep in mind

Usable space is taken as 93 percent of the advertised figure, which is typical after formatting.
Photo sizes are averages: a RAW of a detailed scene weighs noticeably more than a RAW of plain sky.

FAQs

How many photos fit on a 64 GB card?

About 2,100 RAW files from a 24-megapixel camera, or nearly 7,500 JPEGs. For a 45-megapixel camera roughly halve those numbers.

How much video fits on 64 GB?

At 100 Mbps, about 81 minutes; at 25 Mbps, around five hours. Bitrate decides everything here.

Why does the card show less space than the label?

The manufacturer counts a gigabyte as a billion bytes and the operating system counts 1,073,741,824, plus the file system takes its share. Around seven percent in total.

How large is a single RAW file?

25 to 30 megabytes at 24 megapixels, 50 to 60 at 45, up to 80 at 61. Compressed RAW runs roughly half the size of uncompressed.

Worked example

A 64 GB card split down the middle

Input: 64 GB, 24 MP RAW, 100 Mbps video, half for stills

Output: 1,088 photographs and 41 minutes of video

Note: Give the card entirely to stills and it holds 2,176 frames; entirely to video and it manages 81 minutes. That gap is why videographers carry terabyte cards.

Useful links

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Memory Card Capacity Calculator

Result

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