Side-by-Side Comparison
A-Series (ISO 216)
A0 vs. A9
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
A0
A9
A0 is the base unit of the ISO 216 international paper standard, defined with an exact surface area of 1 square meter (1.000 m²) and dimensions of 841 × 1189 mm (33.1 × 46.8 inches). Operating on the 1:√2 Lichtenberg aspect ratio, it is the global standard for large architectural CAD plots, engineering schematics, and academic conference poster presentations.
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)
|
841 × 1189 mm | 37 × 52 mm |
|
Width × Height (Imperial)
|
33.1 × 46.8 in | 1.46 × 2.05 in |
|
Nominal Surface Area
|
1.000 m² (1,000,000 mm²) | 0.001953125 m² (1/512 m² — 1,924 mm²) |
|
Exact Aspect Ratio
|
1 : √2 (1 : 1.4142 — Lichtenberg ratio) | 1 : √2 (1 : 1.4142) |
|
Weight of Standard 80 gsm Sheet
|
80.0 grams exactly | 0.156 grams |
|
Primary Applications
|
Architectural blueprints, GIS cartography, technical CAD schematics, academic research posters | Postage stamps, small jar adhesive labels, index divider tabs, coupon tokens |
|
Halving Relationship
|
Cut in half across length yields 2 sheets of A1 | — |
|
A4 Imposition Yield
|
— | 32 individual A9 pieces per single A4 master sheet |