How Big Can I Print My Digital Photo?

There is a tribe of us who usually enjoy our pictures online.  But occasionally we succumb to the urge to fell trees and emit VOCs by having hard copies of our art printed.  We then find ourselves asking how big can the print be given the resolution of my picture.  In an attempt to address this for my three cameras (I’m counting my iPhone), I came up with the following chart.

    My Printer   Commercial Printers    
Image size Mpixel 300 ppi 200ppi Kodak Wal-Mart Camera
540×360         4×6  
546×390         Wallet  
546×390         5×7  
640×480 0.3 2.1×1.6 3.2×2.4 4×6    
960×768         8×10  
1024×768 0.8 3.4×2.5 5.1×3.8 5×7    
1260×990         11×14  
1400×1050 1.5 4.7×3.5 4.7×5.25      
1536×1024 1.6 5.1×3.4 7.7×5.1 8×10    
1600×1200 1.9 5.3×4 8×6 16×20    
1600×1200 1.9 5.3×4 8×6 20×30   iPhone
1620×1080   5.4×3.6 8.1×5.4   12×18  
1632×1224 2.0 5.4×4.1 8.2 x 6.1      
1800×1440 2.6 6×4.8 9×7.2   16×20  
2590×1920 5.0 8.6×6.4 13.0 x 9.6      
2700×1800 4.9 9×6 13.5×9   20×30  
3621×2519 9.1 12.1×8.4 18.1×12.6     Nikon Coolpix 8700
3648×2736 10.0 12.2×9.2 18.2×13.7     Pentax Optio W60
1050×1500 1.6 3.5×5        
1200×1800 2.2 4×6        
1500×2100 3.2 5×7        
1800×2400 4.3 6×8        
1800×2550 4.6 6×8.5        
2400×3000 7.2 8×10        
2400×3600 8.6 8×12        
3300×4200 13.9 11×14        

For me, this means that I can print my iPhone pictures at 3.5×5 at home, 11×14 at Wal-Mart, or 20×30 at Kodak EasyShare. With my Nikon pictures, I can print up to 8×12 at home or 20×30 at Wal-Mart or Kodak. My Pentax can also do an 8×12 at home or 20×30 at a professional printer, but provides a slightly higher source resolution than the Nikon.

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