Typography UnitsPixels to Millimeters

px to mm

Methodology·How We Verify

Snapshot

1 Pixels equals 0.264583 Millimeters.

Reference basis: This conversion uses CSS pixel-based scaling anchored to 96 pixels per inch.
Example: For 8 Pixels, the result equals 2.116667 Millimeters.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

0.264583 Millimeters (mm)

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API and AI agent access

px to mm.

Machine-readable identifiers

Conversion family: typography-units
Source unit: pixels
Target unit: millimeters

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "typography-units",
  "value": 1,
  "from": "pixels",
  "to": "millimeters"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "typography-units",
    "value": 1,
    "from": "pixels",
    "to": "millimeters",
    "result": {
      "raw": 0.264583333333,
      "display": "0.264583"
    },
    "canonicalPath": "/typography-units/pixels-to-millimeters/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Multiply by 0.264583333333 because 1 px = 1 px and 1 mm = 3.7795275590551185 px.

Method & Typography Basis

Method basis: both units reduce through CSS pixels using the fixed CSS reference of 96 pixels per inch.
Applied factor: 1 Pixels = 0.264583 Millimeters.
Consistency rule: calculator output and common-value rows keep the same CSS pixel baseline and any stated rem/em assumption in both directions.

Common Conversion Values

Pixels (px)	Millimeters (mm)
8	2.116667
10	2.645833
12	3.175
14	3.704167
16	4.233333
18	4.7625
24	6.35
32	8.466667
48	12.7
96	25.4

Questions & answers

Frequently Asked Questions

What defines px to mm?

Both units are normalized through CSS pixels, then converted using a fixed ratio.