How many photos will 8gb hold on a 18mp camera?

Answer 1

Kinda depends, generally in my experience the size of a jpeg high res image directly from, say a canon t2i, is between 5.5 and 11mb, some as much as 16mb. An estimate therefore would be approximately 2979, 1489, and 1024 pics respectively. This however is only an estimate as each picture has different information which takes up more or less space than the previous picture even on the same device. Aditionally, it's unlikely that you would be using or keeping pictures in raw, but if you are, expect considerably less than that, on average canon raw files are around twice the size and generally save jpeg as well for menu images. So it would put that average number at around 750 or so pics, but most likely less.

Answer 2

1 Gigabyte (Gb) is 1 Trillion bytes and a Megabyte (Mb) is 1 Million bytes. So if you did a quick calculation of 8 Trillion (8Gb) divided by 18 million (18Mb), the answer would be 444.444444 Mb (I used Google because most calculators don't have that many digits).

BUT - and here's where it gets complicated - Megabytes are not Megapixels! In fact, depending on the quality setting on your camera, most digital photos have a FILE SIZE of more than 1 Mb. For example, the file for an 18 Megapixel photo might actually be anything from around 3Mb up to 30Mb, depending on the quality setting on the camera.

SO...if you have a 8Gb memory card, you could put as many as 2730 photos (at 3Mb each) or as few as 273 photos (at 30Mb each). At an average file size of 10Mb per photo, which represents a very good quality photo - suitable for printing at the normal size or even for making enlargements - your 8Gb card could hold about 800 photos.