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📄Length Unit & Paper Size Converter

Convert lengths between mm, cm, inch and pt. A-series and US paper size tables included below.

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Unit conversion
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Based on 1 inch = 25.4 mm and 1 pt = 1/72 inch.

How to use

  1. Enter a value and choose the units to convert between.
  2. The result appears automatically.
  3. See the paper size tables below for common dimensions.

Common paper sizes

ISO A-seriesmminches
A3297 × 42011.7 × 16.5
A4210 × 2978.3 × 11.7
A5148 × 2105.8 × 8.3
US sizesmminches
Letter216 × 2798.5 × 11
Legal216 × 3568.5 × 14
Tabloid279 × 43211 × 17

Points (1 pt = 1/72 inch ≈ 0.353 mm) are used for font sizes and print layout. To convert to pixels you also need a resolution — use the DPI Calculator for that.

FAQ

What is a point (pt)?
A print/DTP unit: 1 pt = 1/72 inch, about 0.353 mm. It's what font sizes are measured in.
Why isn't pixel (px) in the list?
A pixel has no fixed physical size — it depends on resolution (DPI). The DPI Calculator handles mm ⇄ px conversion.

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