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My memory card shows less space than advertised

Last Updated: Mar 27, 2017 12:55PM BST

Memory card storage sizes VS actual storage capacity

Storage Size (1GB = 1024mb) Usable Capacity (Approx)
1GB 961 MB (0.94 GB)
2GB 1,908 MB (1.86 GB)
4GB 3,880.96 MB (3.79 GB)
8GB 7,690.24 MB (7.51 GB)
16GB 15,360 MB (15 GB)
32GB 30,412.8 MB (29.7 GB)
64GB 60,958.72 MB (59.53 GB)
128GB 122,071 MB (119.21 GB)
256GB 244,140 MB (238.41 GB)
512GB 488,281 MB (476.83 GB)
1,024GB (1TB, Terabyte) 976,562 MB (953.67 GB)
2,048GB (2TB, Terabyte) 1,953,125 MB (1907.34 GB)
4,086GB (4TB, Terabyte) 3,906,2509 MB (3814.69 GB)
8,192GB (8TB, Terabyte) 7,812,500 MB (7629.39 GB)
16,384GB (16TB, Terabyte) 15,625,000 MB (15,287.80 GB)
32,768GB(32TB, Terabyte) 31,250,000 MB (30,517.57 GB)

It's worth noting..
That this is the same for all flash memory

What does SDHC Class X Mean? 
Well, the simple answer is it relates to the performance of the memory card - where the higher the number equals better performance. Take a look at this table for more information on current SDHC Classes.

Class Minimum performance Application
SDHC Speed Class 2.svg Class 2 MB/s SD video recording
SDHC Speed Class 4.svg Class 4 4 MB/s High-definition video (HD) recording including Full HD (from 720p to 1080p/1080i)
SDHC Speed Class 6.svg Class 6 6 MB/s
SDHC Speed Class 10.svg Class 10 10 MB/s Full HD (1080p) video recording and consecutive recording of HD stills (high-speed data bus)
UHS Class 1.png UHS Speed Class 1 (U1) 10 MB/s Real-time broadcasts and large HD video files (UHS bus)
UHS Class 3.png UHS Speed Class 3 (U3) 30 MB/s 4K video files (UHS bus)

So how many pictures can my camera store on a memory card?

Megapixels

File size (MB)

1GB

2GB

4GB

8GB

16GB

32GB

64GB

128GB

4MP

1.2

715

1430

2861

5722

11444

22888

45776

91552

5MP

1.5

572

1144

2288

4577

9155

18310

36620

73240

6MP

1.8

476

953

1907

3814

7629

15258

30516

61032

7MP

2.1

408

817

1634

3269

6539

13078

26156

52312

8MP

2.4

357

715

1430

2861

5722

11444

22888

45776

10MP

3.0

286

572

1144

2288

4577

9155

18310

36620

12MP

3.6

238

476

953

1907

3814

7629

15258

30516

14MP

4.2

204

408

817

1634

3269

6539

13078

26156

16MP

4.8

178

357

715

1430

2861

5722

11444

22888

22MP

6.6

130

260

520

1040

2080

4161

8322

16644


What about my DSLR? In Uncompressed RAW format?

Megapixels

File size (MB)

1GB

2GB

4GB

8GB

16GB

32GB

64GB

128GB

4MP

12.0

71

143

286

572

1144

2288

4576

9152

5MP

15.0

57

114

228

457

915

1831

3662

7324

6MP

18.0

47

95

190

381

762

1525

3050

6100

7MP

21.0

40

81

163

326

653

1307

2614

5228

8MP

24.0

35

71

143

286

572

1144

2288

4576

10MP

30.0

28

57

114

228

457

915

1830

3660

12MP

36.0

23

47

95

190

381

762

1524

3048

14MP

42.0

20

40

81

163

326

653

1306

2612

16MP

48.0

17

35

71

143

286

572

1144

2288

22MP

66.0

13

26

52

104

208

416

832

1664

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