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Standard Paper Size Dimensions
Formula
Paper sizes vary between the ISO standard (A series, used globally) and North American sizes (Letter, Legal, Tabloid). This converter shows dimensions in millimeters, inches, and pixels at your chosen DPI.
The ISO A series is based on an aspect ratio of 1:√2, where each size is half the area of the next larger size. A4 (210×297 mm) is the most common worldwide.
Common use cases:
- Setting up print documents in design software
- Calculating pixel dimensions for digital templates
- Comparing paper sizes across ISO and US standards
Frequently Asked Questions
Dr. David Park
Applied Mathematician, PhD Mathematics
David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.
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