Pdf Size
Free online PDF page size calculator to convert between A4, Letter, and other standard page dimensions in mm, cm, inches, points, and pixels.
About the PDF Page Size Calculator
The PDF Page Size Calculator is a developer and design utility that allows you to easily convert between standard paper formats and various dimensional units. In PDF documents, the default unit of measurement is the Point (where 1 point equals 1/72 of an inch). Understanding how points translate to actual physical dimensions like millimeters or pixels is essential for formatting print-ready files or rendering graphics.
Common PDF Paper Formats
The two most widely used standard formats are A4 and Letter. A4 is the international standard format measuring 210 by 297 millimeters, equivalent to 595.27 by 841.89 points. Letter size is the standard in North America, measuring 8.5 by 11 inches, equivalent to 612 by 792 points.
Our calculator allows you to instantly toggle between portrait and landscape orientations, select standard presets, or input custom values to see conversions in points, inches, millimeters, centimeters, and pixels at different resolution levels.
Frequently Asked Questions
What is a Point in PDF measurements?
A PDF point is a standard typographic unit defined as exactly 1/72 of an international inch. This means that a standard letter page measuring 8.5 inches wide by 11 inches high is represented in PDF coordinates as 612 points wide by 792 points high.
How does DPI affect the pixel size of a PDF?
DPI stands for Dots Per Inch, which dictates the resolution of the screen or print rendering. A higher DPI means more pixels are packed into each inch of physical space. For example, at 72 DPI, an A4 page is 595 by 842 pixels. At a high-quality print resolution of 300 DPI, the same page requires 2480 by 3508 pixels.
What is the aspect ratio of an A4 page?
ISO A-series paper formats (like A4, A3, and A5) are designed with a unique aspect ratio of 1 to the square root of 2 (approximately 1 to 1.414). This mathematical ratio allows a sheet to be folded in half to create the next smaller size in the series without changing the proportions.
Can I convert custom dimensions?
Yes, simply choose "Custom Size" in the presets or type custom values into the width and height input boxes. The calculator will automatically perform conversions for all units using the configured DPI value.
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