Side-by-Side Comparison
A-Series (ISO 216)
A3 vs. A9
Comparing 2 standards across 8 specifications. 7 key differences identified.
Comparing:
A3
A9
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.
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)
|
297 × 420 mm | 37 × 52 mm |
|
Width × Height (Imperial)
|
11.7 × 16.5 in | 1.46 × 2.05 in |
|
Nominal Surface Area
|
0.125 m² (125,000 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
|
10.0 grams | 0.156 grams |
|
Primary Applications
|
Office spreadsheets, folded A4 booklets, ledger accounting, small posters | Postage stamps, small jar adhesive labels, index divider tabs, coupon tokens |
|
Halving Relationship
|
Cut or folded in half yields 2 sheets / 4 pages of A4 | — |
|
A4 Imposition Yield
|
— | 32 individual A9 pieces per single A4 master sheet |