How to Size QR Codes for Billboards, Banners & Highway Signs

Placing a QR code on a highway billboard or transit shelter requires careful mathematical sizing to ensure passersby can scan it from great distances.

The Distance-to-Size Formula for Outdoor Ads

While handheld print uses a 10:1 ratio, moving outdoor environments require an 8:1 ratio to account for ambient lighting and camera angles.

• Bus Stop & Subway Posters (3 meters distance): Minimum 38 × 38 cm (15 × 15 inches).
• Roadside Billboards (15 meters distance): Minimum 1.9 × 1.9 meters (6.2 × 6.2 feet).
• Highway Billboards (30 meters distance): Minimum 3.8 × 3.8 meters (12.5 × 12.5 feet).