Side-by-Side Comparison
A-Series (ISO 216)
A4 vs. A9
Comparing 2 standards across 9 specifications. 8 key differences identified.
Comparing:
A4
A9
A4 is the international standard paper format defined by ISO 216, measuring 210 × 297 mm (8.27 × 11.69 inches). Utilized by over 140 countries representing approximately 95% of the world's population, it is the universal standard for business letters, official contracts, academic papers, magazine publishing, and desktop office printers.
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
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
210 × 297 mm | 37 × 52 mm |
|
Width × Height (Imperial)
|
8.27 × 11.69 in | 1.46 × 2.05 in |
|
Nominal Surface Area
|
0.0625 m² (1/16 m² — 62,500 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
|
5.0 grams exactly | 0.156 grams |
|
Weight of 500-Sheet Ream (80 gsm)
|
2.50 kg (5.51 lbs) | — |
|
Postal Envelope Pairings
|
C4 (unfolded), C5 (folded once), C6 (folded twice), DL (folded in thirds) | — |
|
A4 Imposition Yield
|
— | 32 individual A9 pieces per single A4 master sheet |
|
Primary Applications
|
— | Postage stamps, small jar adhesive labels, index divider tabs, coupon tokens |