What is the most common paper size?

A4 (210 × 297 mm) is the international standard used in most countries. In the US and Canada, Letter (216 × 279 mm) is the standard. A4 is slightly taller and narrower than Letter.

How does the A-series paper sizing work?

Each A-series size is exactly half the previous size when folded along the longer side. A0 has an area of 1 square meter. A1 = A0 folded in half, A2 = A1 folded in half, and so on. The aspect ratio is always 1:√2 (approximately 1:1.414).

What are C-series paper sizes used for?

C-series sizes are designed for envelopes. C4 fits an unfolded A4 sheet, C5 fits A4 folded once, and C6 fits A4 folded twice. The C sizes are between A and B series dimensions.

What is 300 DPI and why does it matter?

DPI (Dots Per Inch) measures print resolution. 300 DPI is the standard for high-quality printing. An A4 page at 300 DPI is 2480 × 3508 pixels. For web/screen use, 72 DPI is common (595 × 842 pixels for A4).

Is this paper size converter free?

Yes, completely free with no registration required. Works on all devices.

कागज़ आकार कनवर्टर

A, B, C श्रृंखला और US कागज़ आकारों (Letter, Legal, Tabloid) के बीच रूपांतरण करें। mm, cm, इंच और 300 DPI पिक्सल में आयाम।

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श्रृंखला

आकार चुनें

A4

मिमी

210 × 297

सेमी

21.0 × 29.7

इंच

8.27 × 11.69

पिक्सल (300 DPI)

2480 × 3508

सामान्य उपयोग: दस्तावेज़, पत्र, मुद्रण

इस श्रृंखला के सभी आकार

आकार चुनें	मिमी	सेमी	इंच
A0	841×1189	84.1×118.9	33.11×46.81
A1	594×841	59.4×84.1	23.39×33.11
A2	420×594	42.0×59.4	16.54×23.39
A3	297×420	29.7×42.0	11.69×16.54
A4	210×297	21.0×29.7	8.27×11.69
A5	148×210	14.8×21.0	5.83×8.27
A6	105×148	10.5×14.8	4.13×5.83
A7	74×105	7.4×10.5	2.91×4.13
A8	52×74	5.2×7.4	2.05×2.91
A9	37×52	3.7×5.2	1.46×2.05
A10	26×37	2.6×3.7	1.02×1.46

The paper size converter covers all ISO 216 standard sizes (A, B, C series) and North American formats (Letter, Legal, Tabloid, Executive). Select any paper size and instantly see its dimensions in millimeters, centimeters, inches, and pixels at 300 DPI — essential for designers, printers, and anyone working with print layouts.

The A-series follows a clever mathematical principle: each size is exactly half the previous one when cut parallel to the shorter side. A0 starts at exactly 1 square meter of area, and the aspect ratio of every sheet is 1:√2 (approximately 1:1.414). This means you can scale any A-size document to any other A-size without cropping or distortion — a property no other paper system offers.

The B-series provides intermediate sizes between A-series papers, while the C-series is designed specifically for envelopes: C4 fits an unfolded A4, C5 fits A4 folded once, and C6 fits A4 folded twice. North American Letter size (8.5 × 11 inches) is slightly wider but shorter than A4. Use this tool alongside our Unit Converter and Area Calculator for complete measurement needs.

कागज़ आकार कनवर्टर

A4

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