A0 vs. A3
Comparing 2 standards across 7 specifications. 7 key differences identified.
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.
A3 is an ISO 216 standard paper size measuring 297 × 420 mm (11.7 × 16.5 inches), with a surface area of 0.125 square meters (one eighth of A0). It is the standard large-format paper supported by commercial office multifunction printers (MFPs), widely used for financial spreadsheets, two-page A4 magazine spreads, and engineering diagrams.
Specification Comparison Table
7 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
841 × 1189 mm | 297 × 420 mm |
|
Width × Height (Imperial)
|
33.1 × 46.8 in | 11.7 × 16.5 in |
|
Nominal Surface Area
|
1.000 m² (1,000,000 mm²) | 0.125 m² (125,000 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 | 10.0 grams |
|
Halving Relationship
|
Cut in half across length yields 2 sheets of A1 | Cut or folded in half yields 2 sheets / 4 pages of A4 |
|
Primary Applications
|
Architectural blueprints, GIS cartography, technical CAD schematics, academic research posters | Office spreadsheets, folded A4 booklets, ledger accounting, small posters |