Side-by-Side Comparison
A-Series (ISO 216)
A4 vs. A6
Comparing 2 standards across 9 specifications. 8 key differences identified.
Comparing:
A4
A6
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.
A6 is an ISO 216 standard paper size measuring 105 × 148 mm (4.13 × 5.83 inches), with a surface area of 1/64 square meter. Created by folding an A4 sheet into quarters, it is the worldwide postal standard for international picture postcards, pocket diaries, and point-of-sale receipt slips.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
210 × 297 mm | 105 × 148 mm |
|
Width × Height (Imperial)
|
8.27 × 11.69 in | 4.13 × 5.83 in |
|
Nominal Surface Area
|
0.0625 m² (1/16 m² — 62,500 mm²) | 0.015625 m² (1/64 m² — 15,625 mm²) |
|
Exact Aspect Ratio
|
1 : √2 (1 : 1.4142) | 1 : √2 (1 : 1.4142) |
|
Weight of Standard 80 gsm Sheet
|
5.0 grams exactly | 1.25 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) | — |
|
Matching Postal Envelope
|
— | C6 Envelope (114 × 162 mm) |
|
Primary Applications
|
— | International postcards, pocket notebooks (Field Notes style), thermal photo prints, lab sample tags |