Calculadora de tamanho de QR Code: Tamanho de impressão para cada distância

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.

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:

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