In general, the file size of captured image depends on which image size and quality you have selected. Since the image size may vary depending on scenes and subjects, these are approximate values only.
Image Size: 2272x1704 / 1600x1200 / 1280x960 / 640x480
Econ: 500KB/250KB/150KB/50KB
Std: 1.0MB/500KB/300KB/100KB
Fine: 2.0MB/1.0MB/600KB/200KB
Super Fine: 12MB/5.6MB/3.6MB/900KB
Movie: 340KB/s (PAL: 285KB/s)
Audio recording: 8KB/s