QR Code Design & Customisation

QR Code 크기 계산기: 거리별 인쇄 크기

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Formula and lookup tables for calculating minimum QR code size based on scan distance, camera resolution, and module count.

  
  

    
  








  
  

    
    
      
      
  1. 
        QR Code Size Calculator: Print Size for Every Distance
      
    2. 
      
      
  2. 
        The 10:1 Rule
      
    3. 
      
      
  3. 
        Precise Calculation
      
    4. 
      
      
  4. 
        Camera Resolution Factor
      
    5. 
      
      
  5. 
        Version Impact
      
    6. 
      
      
  6. 
        Practical Recommendations
      
    7. 
      
      
  7. 
        Key Takeaways
      
    8. 
      
    

  









  
  

  
  

    
    

      
QR Code Size Calculator: Print Size for Every Distance


The most common question in QR code deployment: "How big does it need to be?" The answer depends on scan distance, module count, and camera resolution.


The 10:1 Rule


A reliable rule of thumb: QR code width = scan distance / 10.






Scan Distance
Minimum QR Code Size






10 cm (phone close-up)
1 cm




30 cm (business card)
3 cm




1 m (poster)
10 cm




3 m (banner)
30 cm




10 m (billboard)
1 m






Precise Calculation


For more accuracy, factor in the QR code version (module count):


Module size = scan distance / (10 x modules per side)


For a Version 5 QR code (37 modules) scanned from 50 cm:
- Module size = 500mm / (10 x 37) = 1.35 mm per module
- QR code width = 37 x 1.35 = 50 mm (5 cm)


Camera Resolution Factor


Modern smartphone cameras (12+ MP) resolve smaller modules than the 10:1 rule suggests. In practice:


    

  • Close range (< 30 cm): Modules as small as 0.33 mm work
    • 

  • Medium range (30 cm - 2 m): Minimum 0.5 mm modules
    • 

  • Long range (> 2 m): Minimum 1 mm modules, prefer larger
    • 



Version Impact


Higher versions have more modules and require larger physical codes at the same distance:






Version
Modules
Min Size at 30 cm






2
25x25
2 cm




5
37x37
3 cm




10
57x57
4.5 cm




20
97x97
7.5 cm






Practical Recommendations


    

  • Business cards: 2-3 cm (Version 2-5, close-range scan)
    • 

  • Flyers and brochures: 3-5 cm (Version 2-7)
    • 

  • Posters and signage: 10-20 cm (scanned from 1-2 m)
    • 

  • Billboards: 50 cm - 1 m (scanned from 5-10 m)
    • 

  • TV screens: Account for screen pixel density and Moire patterns
    • 



Key Takeaways


    

  • Rule of thumb: QR code width = scan distance / 10
    • 

  • Higher versions need larger physical sizes for the same scan distance
    • 

  • Modern cameras can resolve smaller modules than the rule suggests
    • 

  • Always add a safety margin — real-world conditions are imperfect
    • 

  • Test at the actual deployment distance before mass production
    •