A5
A-Series (ISO 216) · 7 specs
Direct Answer
A5 is an ISO 216 standard paper size measuring 148 × 210 mm (5.83 × 8.27 inches), created by cutting or folding an A4 sheet in half. It is the dominant global format for commercial spiral notebooks, daily planners, paperback novels, corporate marketing flyers, and restaurant menus.
Source: ISO 216:2007 (DIN 476-1) · Last reviewed Aug 28, 2026
Specs
| Width × Height (Metric) | 148 × 210 mm |
| Width × Height (Imperial) | 5.83 × 8.27 in |
| Nominal Surface Area | 0.03125 m² (1/32 m² — 31,250 mm²) |
| Exact Aspect Ratio | 1 : √2 (1 : 1.4142) |
| Weight of Standard 80 gsm Sheet | 2.5 grams |
| Halving Relationship | Cut in half yields 2 sheets of A6 |
| Primary Applications | Stationery notebooks (Moleskine, Rhodia), marketing flyers, paperback booklets, event programs |
The Global Notebook and Stationery Standard
A5 is the most popular size for personal journals, bullet notebooks (Leuchtturm1917, Rhodia Webnotebook), and corporate meeting planners. Its 148 × 210 mm footprint fits comfortably into briefcases and backpacks while providing ample line space for handwriting.
Two-Up Printing on A4
In commercial digital printing, two A5 pages are printed side-by-side on a single A4 sheet ('2-up imposition'). When folded down the center, it creates a self-contained 4-page A5 brochure with zero paper trimming waste.