/convert/inches-to-a4/ Convert inches to mm (paper) instantly. Includes a reference table and formula. article inches to mm (paper) Converter — 247QuickTools ,{ "@context": "https://schema.org", "@type": "SpeakableSpecification", "cssSelector": [".tool-intro", ".info-gain-section"] }
📄 Paper Sizes

inches to mm (paper) Converter

Convert inches to mm (paper) instantly. Includes a reference table and formula.

Quick answer: To convert inches to mm (paper), multiply by 25.4. For example, 1 inches = 25.4 mm (paper). Use the calculator below for any value.
inches to mm (paper)
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Common conversions
inches mm (paper)
Formula:

How to convert inches to mm (paper)

1

Enter your value

Type the number of inches you want to convert into the left box. The result in mm (paper) appears instantly in the right box. You can also type into the right box to convert in the other direction.

2

Use the swap button

Click the ⇄ Swap button to reverse the conversion — mm (paper) to inches. Your current value carries across so you don't have to re-enter anything.

3

About inches and mm (paper)

inches and mm (paper) are paper sizes and dimensions. Use this converter to switch between them instantly.

💡 Did you know?

A4 in inches: 8.27 × 11.69 inches. The A4 aspect ratio is √2:1 (1.414:1) — derived so that folding in half produces the next smaller size with the same ratio. Letter is 8.5 × 11 inches with aspect ratio 1.294:1. The A-series elegance is the halving property.

📊 Common conversions at a glance
inches mm (paper)
0.5 12.7
1 25.4
2 50.8
3 76.2
4 101.6
5 127
Reviewed for 2026. inches ↔ mm (paper) conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.