This question cannot be answered, as It depends on the format you shoot in, JPEG or RAW being the most common. JPEG files will be almost half the size of RAW files, and you might even have a choice of standard, fine, extra fine in your camera settings with each of these files being bigger than the next. RAW files can come in either compressed or uncompressed. These files are very large, uncompressed almost twice as large as compressed. RAW is the best quality but to get the most out of those files you need a computer with Lightroom or another post processing/editing software. If you don't plan on doing editing later, stick with JPEG. I would say with the camera in JPEG FINE or EXTRA FINE you'll get over 2000 pictures with this card, in RAW, much less.