The international ISO 216 paper standard is built on the elegant logic of the 1:√2 aspect ratio, allowing paper to be folded in half to create the next size down without changing proportions. Our A-Series Paper Converter provides the exact dimensions for sizes from billboard-sized A0 to the tiny A10. Get width and height in mm, cm, and inches for perfect print layouts and digital design scaling.
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A-Series Paper Converter
Calculate dimensions for A0, A1, A2, A3, A4, and other ISO 216 sizes in mm and inches.
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ISO 216 A-Series Chart
A-series paper sizes are defined by the ISO 216 international standard. Each size is half the area of the previous size.
Millimeters
210 × 297
Inches
8.3" × 11.7"
Aspect Ratio
All A-series paper has an aspect ratio of **1:√2** (approx 1:1.41). This maintain proportions when folding paper in half to create the next size down.
Fun Fact
An **A0** sheet has an area of exactly **one square meter**. Each subsequent size halves the area while keeping the same shape.
About ISO 216 A-Series Paper Sizes
1
Select Size
Choose an A-series size like A4 or A3.
2
View Dimensions
Instantly see width and height in various units.
3
Save Your Output
Click the download or copy button to export your results to your device or clipboard.
Key Features
Complete ISO Support
Includes the entire A-Series range from A0 (1 square meter) down to A10.
Multi-Unit Precision
Delivers dimensions in millimeters for print and inches for international design specs.
Fold Logic Analytics
Explains the relationship between parent and child sizes for efficient imposition.
Frequently Asked Questions
All A-series paper sizes have an aspect ratio of 1:√2 (approx 1:1.414).
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