A9
A-Series (ISO 216) · 7 specs
Direct Answer
A9 is an ISO 216 standard paper size measuring 37 × 52 mm (1.46 × 2.05 inches), with a surface area of 1/512 square meter. Created by cutting an A8 sheet in half, it is standard for miniature barcode labels, commemorative postage stamps, bookkeeper index tabs, and food expiration stickers.
Source: ISO 216:2007 (DIN 476-1) · Last reviewed Aug 28, 2026
Specs
| Width × Height (Metric) | 37 × 52 mm |
| Width × Height (Imperial) | 1.46 × 2.05 in |
| Nominal Surface Area | 0.001953125 m² (1/512 m² — 1,924 mm²) |
| Exact Aspect Ratio | 1 : √2 (1 : 1.4142) |
| Weight of Standard 80 gsm Sheet | 0.156 grams |
| A4 Imposition Yield | 32 individual A9 pieces per single A4 master sheet |
| Primary Applications | Postage stamps, small jar adhesive labels, index divider tabs, coupon tokens |
Micro-Labeling and Postage Standards
A9 provides a standardized micro-format for pharmaceutical prescription bottle stickers, inventory barcode tags, and commemorative postage stamps. Exactly 32 A9 labels fit onto a standard A4 sticker backing sheet.