How big should your SD card be? The short answer for most people is that a 32GB card is the smallest one you should consider for phone or camera. A 64GB SD card is probably a far better option for minimal extra cost. SD cards with a capacity of 32GB and under fall into the SDHC camp, while cards sized at 64GB and over are classed as SDXC. The long answer is that the size of the card depends on what kind of photographer you are. If you’re really into taking photographs, you should aim for a card that will store between 1,500 and 2,000 images from whatever camera / phone you currently use.