Side-by-Side Comparison
A-Series (ISO 216)
A5 vs. A9
Comparing 2 standards across 8 specifications. 7 key differences identified.
Comparing:
A5
A9
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.
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.
Specification Comparison Table
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
148 × 210 mm | 37 × 52 mm |
|
Width × Height (Imperial)
|
5.83 × 8.27 in | 1.46 × 2.05 in |
|
Nominal Surface Area
|
0.03125 m² (1/32 m² — 31,250 mm²) | 0.001953125 m² (1/512 m² — 1,924 mm²) |
|
Exact Aspect Ratio
|
1 : √2 (1 : 1.4142) | 1 : √2 (1 : 1.4142) |
|
Weight of Standard 80 gsm Sheet
|
2.5 grams | 0.156 grams |
|
Primary Applications
|
Stationery notebooks (Moleskine, Rhodia), marketing flyers, paperback booklets, event programs | Postage stamps, small jar adhesive labels, index divider tabs, coupon tokens |
|
Halving Relationship
|
Cut in half yields 2 sheets of A6 | — |
|
A4 Imposition Yield
|
— | 32 individual A9 pieces per single A4 master sheet |