Look up paper dimensions for A series, B series, US Letter, Legal, and Tabloid. Shows sizes in mm, inches, and points.
The Paper Size Reference tool provides dimensions for all standard paper sizes in the ISO A series, B series, and common US/North American formats. View dimensions in millimeters, inches, or typographic points instantly.
The ISO 216 standard defines A-series paper sizes, where A0 is exactly 1 square meter in area and each successive size (A1, A2, A3, A4, ...) is half the previous one. The aspect ratio is always 1:√2, which means folding a sheet in half produces the next smaller size with the same proportions. This elegant system is used worldwide except in the US and Canada.
US paper sizes (Letter, Legal, Tabloid, Ledger) evolved from traditional printing practices and have no mathematical relationship to each other. This reference covers both systems so you can quickly compare and convert between them.
Tracking this metric consistently enables professionals to identify patterns in how they allocate time and effort, revealing opportunities to work more effectively and accomplish more each day.
Designers, printers, and office workers frequently need exact paper dimensions. This reference eliminates searching through multiple charts and shows all sizes with mm, inch, and point measurements. Precise quantification supports meaningful goal-setting and accountability, ensuring that improvement efforts are focused on areas with the greatest potential impact on output. Data-driven tracking enables proactive schedule management, helping professionals protect focused work time and reduce the cognitive overhead of constant task-switching throughout the day.
ISO A-series: A0 = 841 × 1189 mm (1 m²). Each size = previous ÷ 2 along the long edge. Aspect ratio = 1:√2 ≈ 1:1.4142. 1 inch = 25.4 mm. 1 point = 1/72 inch = 0.3528 mm.
Result: 210 × 297 mm / 8.27 × 11.69 in
A4 paper is 210 mm wide by 297 mm tall. In inches, that's 8.27 × 11.69. In points (for design software), it's 595 × 842 pt. A4 is the most commonly used paper size worldwide and is slightly narrower and taller than US Letter.
ISO 216 was adopted in 1975 and is based on the German DIN 476 standard from 1922. The mathematical elegance of the 1:√2 aspect ratio means that any A-series sheet folded in half produces the next smaller size with identical proportions, making scaling straightforward.
US Letter (8.5 × 11 in) and Legal (8.5 × 14 in) have no mathematical basis. They evolved from traditional papermaking practices. ANSI/ASME Y14.1 defines engineering drawing sizes (A through E), which are different from consumer paper sizes.
When creating documents for international distribution, design for A4 with margins that also work on Letter paper. Most printers can handle both sizes. For printing, always check the margin requirements — most printers have a 5–10 mm non-printable border.
Globally, A4 (210 × 297 mm) is the most common paper size. In the United States and Canada, Letter size (8.5 × 11 inches or 216 × 279 mm) is the standard.
A4 is 210 × 297 mm (8.27 × 11.69 in). US Letter is 216 × 279 mm (8.5 × 11 in). Letter is wider but shorter than A4. This can cause formatting issues when sharing documents internationally.
A0 is 841 × 1189 mm (exactly 1 m²). Each subsequent size (A1, A2, A3, etc.) is created by cutting the previous size in half parallel to the short side. The aspect ratio of 1:√2 is maintained throughout.
B-series sizes fall between A-series sizes. B5 is between A4 and A5, for example. They are commonly used for books, passports, posters, and specialty printing where A-series sizes are too big or too small.
A point (pt) is 1/72 of an inch (0.3528 mm). Design software like Adobe InDesign and Illustrator use points as the native unit. A4 in points is 595 × 842 pt.
Tabloid and Ledger are the same sheet: 11 × 17 inches (279 × 432 mm). Tabloid refers to portrait orientation; Ledger refers to landscape. It's exactly two Letter sheets side by side.