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About QR Code Size Calculator
The QR Code Physical Print Size & Scanning Distance Calculator computes optimal physical dimensions (cm / inches / mm) for QR codes based on expected scanning distance (10:1 ratio rule), camera lens focal length, version module matrix, and print DPI.
How to Use QR Code Size Calculator
Step 1
Enter the expected distance between the user smartphone and the QR code.
Step 2
Enter the character count of your URL or text payload.
Step 3
Review minimum recommended print dimensions in cm and inches.
Step 4
Copy print specifications for your graphic designer.
Practical Use Cases for QR Code Size Calculator
Sizing Billboard & Highway Banner QR Codes for Far-Distance Scanning
Calculate exact physical banner dimensions (e.g. 1.5 meters wide) required for drivers or pedestrians to scan a QR code from 15 meters away.
Sizing Product Packaging & Business Card QR Codes
Determine the minimum safe print size (e.g. 2.0 x 2.0 cm) to ensure modern smartphone cameras can focus and scan reliably from 20 cm away.
Input & Output Examples
Calculating Print Size for 3-Meter Scanning Distance
Scanning Distance: `3.0 meters (10 feet)`, Data Length: `50 Characters (Version 4, 33x33)`
Recommended Minimum QR Size: `30.0 cm x 30.0 cm (11.8 x 11.8 inches)` | Minimum Module Size: `9.1 mm`
Key Features & Performance
- ✓Calculates using optical 10:1 ratio rule (Distance to Size) and camera sensor angular resolution.
- ✓Recommends minimum module sizes for Offset Printing (300 DPI), Screen Printing, and Billboard Flex.
- ✓Displays QR Code Version Matrix ($21\times21$ to $177\times177$) and data byte density.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy sizing specifications.
Key Terminology & Definitions
10:1 Distance-to-Size Ratio Rule
An industry standard optical rule stating that a QR code physical width should be at least 1/10th of the scanning distance (e.g. 10m distance $\rightarrow$ 1m wide code).
Individual Module
The smallest individual black or white square pixel unit inside a QR code matrix.