📄 A 시리즈 용지 사이즈표

A 시리즈 용지 소개

A 시리즈 용지 : 사무 문서, 편지·보고서, 일상 인쇄.

The A series is derived from one area and one ratio, not a list of arbitrary numbers. A0 has an area of exactly one square metre and a fixed 1:√2 ratio, which gives 841 × 1189 mm after rounding. A1 is half of A0 cut across the long side, and A4 is A0 folded four times: 210 × 297 mm.

The practical benefit is that folding preserves the shape. A4 folds to A5, A5 to A6; two A4 sheets side by side make A3, and four make A2. For leaflets, booklets and inner pages, layouts built on this relationship keep their proportions after trimming.

The A series is not the same system as Chinese K-sheets or US Letter. 16K is usually a little smaller than A4, around 195 × 270 mm or 210 × 285 mm; Letter is 215.9 × 279.4 mm, wider and shorter than A4. Printing a Letter PDF on A4 without scaling clips the right edge, so confirm the paper system and scaling before output.

Print work also needs tolerance and process settings. Add 3 mm bleed on each edge and keep text 3–5 mm inside the trim; A4 with bleed is 216 × 303 mm. 300 DPI is the normal target for photos and text, and paper weight controls feel and thickness: 80 gsm is office paper, 120–170 gsm is a leaflet, and 250–350 gsm is a card or cover.

ISO A 시리즈는 1:√2 비율이라 한 단계 위 규격의 절반 면적입니다. A4(210 × 297 mm)를 반으로 접으면 A5, 두 장을 붙이면 A3가 됩니다.

B 시리즈는 포스터·책·봉투에, C 봉투는 A4를 접어 넣을 수 있는 크기입니다. 중국에서는 16K·8K·32K 같은 K 규격도 책과 노트에 많이 쓰입니다.

A 시리즈 용지 자주 묻는 질문