Global Sheet Dimension Reference
Paper Size Calculator (ISO 216 & US Standards)
Lookup and convert dimensions for ISO A/B/C series and North American paper standards in mm, cm, inches, and px.
Calculated Value
2480px
Input Unit
210 mm W
DPI Target
300 DPI
Mathematical Formula
ISO A-Series: Aspect Ratio is always 1:√2 (1:1.4142) for perfect halving
Quick Presets & Industry Standards
Frequently Asked Questions
What is the aspect ratio of ISO A-series paper?
All ISO 216 A-series sizes have an aspect ratio of 1:√2 (1:1.4142), meaning folding a sheet in half produces the next smaller size without changing proportion.