Question 1

What is the ISO 216 paper size standard?

Accepted Answer

ISO 216 is the international standard for paper sizes used in most countries worldwide. The A series (A0, A1, A2...) has a consistent aspect ratio of 1:√2 (approximately 1:1.414). Each size is exactly half the area of the one before it — folding A3 in half gives A4. This property means scaling content from one size to another is simple and predictable.

Question 2

What is A4 size in inches?

Accepted Answer

A4 paper measures 210 × 297 mm, or approximately 8.27 × 11.69 inches. This is slightly different from US Letter (8.5 × 11 inches) — A4 is narrower but taller. A4 is the standard for most countries including Europe, Asia, and Australia. The US, Canada, and some parts of Latin America primarily use Letter size.

Question 3

What is the difference between A4 and US Letter?

Accepted Answer

A4: 210 × 297 mm (8.27 × 11.69"). Letter: 216 × 279 mm (8.5 × 11"). A4 is taller and slightly narrower than Letter. A document formatted for A4 will have slightly cut-off top/bottom margins when printed on Letter, and vice versa. When printing documents for international use, it is safest to use A4.

Question 4

What is the B series of paper sizes?

Accepted Answer

The ISO B series provides intermediate sizes between A sizes. B0 = 1000 × 1414 mm, B1 = 707 × 1000 mm, etc. B sizes are geometric means between consecutive A sizes. B series paper is less common for office use but is widely used for posters, passports (B7), and books. The same 1:√2 aspect ratio applies.

Question 5

What are the most common North American paper sizes?

Accepted Answer

Letter (8.5 × 11") — standard office paper. Legal (8.5 × 14") — legal documents, contracts. Tabloid/Ledger (11 × 17") — newspapers, large spreadsheets. Executive (7.25 × 10.5") — executive stationery. Government Letter (8 × 10.5") — US government forms. These are defined by the American National Standards Institute (ANSI) rather than ISO.

名称	宽度	高度
A0	841 mm	1189 mm
A1	594 mm	841 mm
A2	420 mm	594 mm
A3	297 mm	420 mm
A4	210 mm	297 mm
A5	148 mm	210 mm
A6	105 mm	148 mm
A7	74 mm	105 mm
A8	52 mm	74 mm
A9	37 mm	52 mm
A10	26 mm	37 mm

名称	宽度	高度
B0	1000 mm	1414 mm
B1	707 mm	1000 mm
B2	500 mm	707 mm
B3	353 mm	500 mm
B4	250 mm	353 mm
B5	176 mm	250 mm
B6	125 mm	176 mm
B7	88 mm	125 mm
B8	62 mm	88 mm

名称	宽度	高度
Letter	216 mm	279 mm
Legal	216 mm	356 mm
Tabloid	279 mm	432 mm
Executive	184 mm	267 mm
Government Letter	203 mm	267 mm

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