A10
A-Series (ISO 216) · 7 specs
Direct Answer
A10 is the smallest standardized paper size defined under ISO 216, measuring 26 × 37 mm (1.02 × 1.46 inches) with a surface area of 1/1024 square meter. It is standard for admission raffle ticket stubs, micro coupons, small security inspection stamps, and dental sample labels.
Source: ISO 216:2007 (DIN 476-1) · Last reviewed Aug 28, 2026
Specs
| Width × Height (Metric) | 26 × 37 mm |
| Width × Height (Imperial) | 1.02 × 1.46 in |
| Nominal Surface Area | 0.0009765625 m² (1/1024 m² — 962 mm²) |
| Exact Aspect Ratio | 1 : √2 (1 : 1.4142) |
| Weight of Standard 80 gsm Sheet | 0.078 grams |
| A4 Imposition Yield | 64 individual A10 pieces per single A4 master sheet |
| Status in ISO 216 | The absolute smallest formal size defined in the standard |
The Terminal Metric Paper Size
A10 represents the 10th consecutive halving of the 1-square-meter A0 sheet. A single sheet of A4 yields 64 A10 slips without a single millimeter of scrap. Beyond A10, manual handling and printing machine feeding mechanisms become impractical.