QR Code Size Calculator
Calculate the minimum QR code size for reliable scanning at any distance. Based on the 10:1 scanning ratio.
Scanning Distance
Minimum Size
minimum recommended size
This calculator uses the 10:1 ratio: the QR code should be at least 1/10th of the scanning distance. For printed materials or challenging conditions (poor lighting, angled viewing), consider increasing the size by 20-50%.
Quick Reference Chart
| Use Case | Scan Distance | Min. Size |
|---|---|---|
| Business card | 15-30cm | 1.5-3cm |
| Flyer / Brochure | 30-50cm | 3-5cm |
| Poster (A3/A2) | 1-2m | 10-20cm |
| Banner / Sign | 3-5m | 30-50cm |
| Billboard | 10-20m | 1-2m |
| Product label | 10-20cm | 1-2cm |
| Table tent | 30-60cm | 3-6cm |
| Window display | 1-3m | 10-30cm |
Tips for Reliable Scanning
Quiet Zone
Leave white space around your QR code equal to 4 modules (the small squares). Most generators handle this automatically.
Contrast
Dark foreground on light background works best. Avoid low contrast colour combinations. Black on white is most reliable.
Print Resolution
For print, use 300 DPI minimum. Export as SVG for perfect scaling at any size, or use high-resolution PNG.
Frequently Asked Questions
What is the 10:1 rule for QR codes?
The 10:1 rule states that the minimum QR code size should be 1/10th of the scanning distance. For example, if users will scan from 1 metre away, the QR code should be at least 10cm. This ensures reliable scanning across different devices.
What happens if my QR code is too small?
QR codes that are too small may fail to scan or require users to get uncomfortably close. Older phones with lower resolution cameras are especially affected. When in doubt, go larger.
Does adding a logo affect the minimum size?
Yes. Logos cover part of the QR code, reducing readable data. Use higher error correction (H level, 30%) when adding logos, and increase the size by 20-30% to compensate.
What resolution should I use for printing?
Use 300 DPI for professional print quality. For large format printing viewed from distance, 150 DPI is often sufficient. SVG format scales perfectly and is ideal for print.
Can I make my QR code smaller with higher error correction?
No. Higher error correction actually adds more data to the QR code, making the modules (squares) smaller. This can make scanning harder at a distance. Use higher error correction for durability, not size reduction.
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Generate QR codes in any size with custom styling and high-resolution export.