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The Ultimate QR Code Master Cheat Sheet (Formulas, Sizing & Specs)
Bookmark this master cheat sheet for quick reference across all QR code dimensions, mathematical formulas, and protocol URI formats.
1. Standard URI Schemes Reference
| Type | URI Format Example |
| Website URL | https://example.com |
| Wi-Fi Password | WIFI:T:WPA;S:MySSID;P:MyPassword;; |
https://wa.me/1234567890?text=Hello |
|
| UPI Payment | upi://pay?pa=name@bank&pn=Merchant&am=100&cu=INR |
| Phone Call | tel:+1234567890 |
| SMS Text | SMSTO:+1234567890:DraftMessage |
mailto:support@example.com?subject=Help |
2. Sizing & Distance Golden Rule
Minimum QR Width = Scanning Distance / 10 (e.g. 20 cm distance = 2 cm width; 2 meters distance = 20 cm width).