概要
A4 measures 210 × 297 mm and is the standard office and school paper size across most countries using ISO paper formats. If you print outside North America, A4 is often the default page your printer expects.
A4 belongs to the ISO 216 A series and keeps the same 1:√2 aspect ratio as A3, A5, and the other A-series sheets. It is narrower and taller than US Letter.
印刷用テンプレートとハブ
このサイズ、関連ワークフロー、またはレイアウト意図に近い内部ページとして、これらの印刷用ページを使えます。
A4 大学罫
7.1mm行間のA4罫線紙（大学罫）
A4 Grid 5mm
A4 5mm grid, common for STEM notes
ドット方眼 5mm (A4)
5mm間隔のA4ドット方眼紙
Lined & ruled paper
College ruled, wide ruled, legal pad layouts, and printable ruled sheets.
Notebook paper
Composition layouts, filler paper, loose leaf sheets, and note-friendly printable pages.
Graph & grid paper
Quarter-inch grids, engineering paper, coordinate planes, and specialty math layouts.
関連ガイド記事
A4 用紙サイズをインチで見る: 寸法と換算
A4 は 210 x 297 mm、約 8.27 x 11.69 インチです。Letter との違いと、実寸で印刷する方法を整理します。
A4 と Letter はどちらを選ぶべきか
A4 と US Letter の違い、ISO と ANSI の関係、印刷時に拡大縮小トラブルを避ける方法を整理します。
Paper Sizes: ISO vs ANSI, Letter, Legal, A4, and 11x17
Compare ISO and North American paper sizes: A4, A3, Letter, Legal, Tabloid, Ledger, and 11x17. Choose the right size before exporting PDFs.
よくある質問
What is A4 paper size in millimeters?
A4 is 210 × 297 mm.
What is A4 paper size in inches?
A4 is about 8.27 × 11.69 inches.
Is A4 the same size as US Letter?
No. A4 is 210 × 297 mm, while US Letter is 215.9 × 279.4 mm, so A4 is narrower and taller.