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Paper Size Converter

Unit Converters

A/B/C series in mm and inches with area

Quick Answer

Paper Size Converter: A/B/C series in mm and inches with area. A0 = exactly 1 m² (841×1189mm); constant ratio 1:√2.

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How to Use

  1. Pick units: switch source and target units in the Paper Size Converter.
  2. Enter a value: results sync both ways instantly — no convert button needed.
  3. Use the reference table: common conversions are listed for instant lookup.
  4. Copy the result: copy the converted value with its unit.

Key Points

  • Paper Size Converter is a free online unit conversion tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: A/B/C series in mm and inches with area.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

ISO 216 paper sizes

A0 = exactly 1 m² (841×1189mm); constant ratio 1:√2
Halving the long edge yields the next size; A4 = 210×297mm
B series is √2× the same A number; C envelopes fit A sheets (C4 holds A4 flat)

FAQ

How do I use the Paper Size Converter?
Open the page and fill in the input fields — results update automatically. A/B/C series in mm and inches with area.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on SI conversion factors and international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Paper Size Converter[EB/OL]. https://www.yijiansuan.com/en/c/convert/paper-size

Results provided by this tool are for reference only and do not constitute professional advice.