Here are some typical file sizes to make certain sizes of prints:
- 4×6 inch print: 800 x 1200 pixels
- 5×7 inch print: 1000 x 1400 pixels
- 8×10 inch print: 1600 x 2000 pixels
- 11×14 inch print: 2200 x 2800 pixels
http://www.imagemaven.com/how-to-choose-camera-settings-that-give-the-best-file-quality/