Pixels (CSS) to Millimetres
Type a value in Pixels (CSS) and get the result in Millimetres, calculated exactly.
16 Pixels (CSS) ≈ 4.233333333 Millimetres
Precision
Exact factorRounded for display to about 10 significant digits.
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Formula
mm = px × 0.264583333333
To convert Pixels (CSS) to Millimetres, multiply the value by 0.264583333333.
Worked examples
- 1 px × 0.264583333333 ≈ 0.2645833333 mm
- 16 px × 0.264583333333 ≈ 4.233333333 mm
- 100 px × 0.264583333333 ≈ 26.45833333 mm
This factor is exact by definition.
Conversion table
| Pixels (CSS) (px) | Millimetres (mm) |
|---|---|
| 1 | ≈ 0.2645833 |
| 2 | ≈ 0.5291667 |
| 4 | ≈ 1.058333 |
| 8 | ≈ 2.116667 |
| 10 | ≈ 2.645833 |
| 12 | 3.175 |
| 14 | ≈ 3.704167 |
| 16 | ≈ 4.233333 |
| 18 | 4.7625 |
| 20 | ≈ 5.291667 |
| 24 | 6.35 |
| 32 | ≈ 8.466667 |
| 36 | 9.525 |
| 48 | 12.7 |
| 64 | ≈ 16.93333 |
| 72 | 19.05 |
| 96 | 25.4 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Millimetres to Pixels (CSS)
| Millimetres (mm) | Pixels (CSS) (px) |
|---|---|
| 1 | ≈ 3.779528 |
| 2 | ≈ 7.559055 |
| 4 | ≈ 15.11811 |
| 8 | ≈ 30.23622 |
| 10 | ≈ 37.79528 |
| 12 | ≈ 45.35433 |
| 14 | ≈ 52.91339 |
| 16 | ≈ 60.47244 |
| 18 | ≈ 68.0315 |
| 20 | ≈ 75.59055 |
| 24 | ≈ 90.70866 |
| 32 | ≈ 120.9449 |
| 36 | ≈ 136.063 |
| 48 | ≈ 181.4173 |
| 64 | ≈ 241.8898 |
| 72 | ≈ 272.126 |
| 96 | ≈ 362.8346 |
Unit definitions
- Pixels (CSS) px
- The CSS reference pixel: exactly 1/96 of an inch.
- Millimetres mm
- One thousandth of a metre; 25.4 mm make an inch.
Questions people ask
Pixels (CSS) to Millimetres: what is the conversion factor?
One px is ≈ 0.2645833333 mm.
How do I convert Pixels (CSS) to Millimetres?
Use the formula above. For example, 16 px = ≈ 4.233333333 mm.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.