# Paper Size Quick Reference

> Find exact millimeter and inch dimensions for international standard paper formats.

Page: https://askcalculators.com/calculator/paper-size-calculator/
Definition: https://askcalculators.com/calculator/paper-size-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/paper-size-calculator/schema.json
Version: 7.1.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/paper-size-calculator/?format=A4

## Inputs
- format: Format; type=select; optional; default=A4

## Outputs
- result: Result; format=text; primary

## Formula
Look up ISO A-series nominal dimensions in millimeters. For North American formats, millimeters = inches × 25.4; diagram aspect ratio = width / height.

A-series values are nominal trimmed sizes. Physical manufacturing and printer tolerances may differ.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.