Memory Card Capacity Calculator

Written byOleh Soloninupdated 5 October 2026

Card capacity, GB

Photo format

Video bitrate, Mbps

Share of the card for stills, %

Result

Photographs1,142
Minutes of video43
Stills only2,285
Video only, minutes85
Capacity in GiB — what a computer shows59.6
Size of one photo24 MP RAW — 28 MB

Gigabytes on the packet and in Windows differ

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

A 64-gigabyte card is 64 billion bytes. Windows divides that by 2³⁰ and shows 59.6 "GB": nothing has gone missing, the maker and the system simply count gigabytes differently. 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.

How to use

Enter the card capacity in gigabytes.
Set the video bitrate and the photo resolution.
Say what share of the card goes to stills.
Compare with what your computer shows: Windows reports fewer gigabytes than the label, which is a different way of counting rather than lost space.

What actually fits

Each row is a run of this calculator at 100 Mbit/s video, 28-megabyte RAW stills and the card split evenly between photos and video.

The calculator counts a gigabyte the way the manufacturer does, as a billion bytes. Windows counts 1024 cubed and so shows 6.9 percent less: 59.6 on a card sold as 64, while current macOS counts like the manufacturer. A difference in arithmetic, not in hardware.

Runs of this calculator at 100 Mbit/s video, 28 MB RAW stills and the card split evenly.
Labelled	Windows shows	Half stills, half video	Stills only	Video only
64 GB	59.6 GiB	1,142 stills and 43 minutes	2,285 stills	85 minutes
128 GB	119.21 GiB	2,285 stills and 85 minutes	4,571 stills	171 minutes
256 GB	238.42 GiB	4,571 stills and 171 minutes	9,142 stills	341 minutes

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 card's size in GiB, as a computer shows it

What to keep in mind

64 GB on a card is 64,000,000,000 bytes, or about 59.6 GiB as a computer shows it: no space is lost. The file system's own overhead is not deducted.
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?

2,285 RAW files from a 24-megapixel camera, or 8,000 JPEGs, at the file sizes the calculator assumes. For 45-megapixel RAW it is 1,163, roughly half.

How much video fits on 64 GB?

At 100 Mbps, 85 minutes; at 25 Mbps, 341 minutes, or 5 h 41 min. Bitrate decides everything here.

Why does my computer show less than the label?

The manufacturer counts a gigabyte as a billion bytes, while Windows divides by 1,073,741,824 and still labels the result "GB" — hence 59.6 instead of 64. Current macOS shows decimal gigabytes, as on the packet. The file system's own areas take a little more, which the calculator does not deduct.

How large is a single RAW file?

It depends on the camera, bit depth and compression. The calculator takes a nominal 28 MB for 24 MP RAW, 55 for 45 MP and 70 for 61 MP; for an exact figure, check the file size your camera writes in the mode you use.

What will Windows show for 128 and 256 GB cards?

119.21 and 238.42: the same 128 and 256 billion bytes divided by 2³⁰. The gap of about 6.9 percent does not depend on the size.

Why does video eat a card so fast?

Because bitrate is per second. At 100 Mbit/s one minute takes 750 megabytes — more than twenty-six RAW stills. An hour of that will not fit even on a 32-gigabyte card.

Worked example

A 64 GB card split down the middle

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

Output: 1,142 photographs and 43 minutes of video

Note: Give the card entirely to stills and it holds 2,285 frames; entirely to video and it manages 85 minutes. That gap is why videographers carry terabyte cards.

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Result

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