Millimeter to Inch (mm to in)
Convert mm to in — Typography converter
One millimeter equals 0.03937008 in, so to convert millimeters to inches you multiply the value by 0.03937008. A millimeter is smaller than a inch — going the other way, 1 in = 25.4 mm. For example, 10 mm = 0.39370079 in and 50 mm = 1.968504 in.
1 mm = 0.03937008 in
Millimeter to Inch formula
1 Millimeter = 0.03937008 in
Worked examples
- 25 mm = 0.98425197 in
- 100 mm = 3.937008 in
Millimeter to Inch conversion table
| Millimeter (mm) | Inch (in) |
|---|---|
| 1 | 0.03937008 |
| 8 | 0.31496063 |
| 10 | 0.39370079 |
| 11 | 0.43307087 |
| 12 | 0.47244094 |
| 14 | 0.5511811 |
| 16 | 0.62992126 |
| 18 | 0.70866142 |
| 20 | 0.78740157 |
| 24 | 0.94488189 |
| 32 | 1.259843 |
| 36 | 1.417323 |
| 48 | 1.889764 |
| 64 | 2.519685 |
| 72 | 2.834646 |
Why 16 px equals 12 pt
Two fixed definitions drive every conversion on this page. A typographic point is 1/72 of an inch. A CSS reference pixel is 1/96 of an inch. That makes 1 px exactly 0.75 pt, and 16 px exactly 12 pt — which is why 16 px became the default body size on the web: it matches the 12 pt that print had already settled on.
A pica is 12 points, so 1 pica = 16 px. InDesign, Quark and most print workflows measure column widths and gutters in picas; CSS has no pica unit, so those measurements have to be converted before they reach a stylesheet. On this page, 1 mm = 0.03937008 in.
The CSS pixel is a reference unit, not a hardware pixel. On a 2× or 3× display, one CSS px still occupies 1/96 inch of visual space — the device simply renders it with more physical pixels. Converting CSS px to physical pixels requires the device pixel ratio, which is a separate calculation from anything on this page.
Metric print specs go through the inch: 1 in = 25.4 mm = 96 px = 72 pt. A 210 mm A4 page width is therefore about 794 px at 96 dpi — useful when matching a web layout to a printed one.
Frequently asked questions
How many inches are in one millimeter?
One millimeter equals 0.03937008 inches (in).
How many millimeters are in one inch?
One inch equals 25.4 millimeters (mm).
How do you convert millimeters to inches?
1 Millimeter = 0.03937008 in. Use the calculator above for any value.
What is 5 mm in in?
5 mm = 0.19685039 in.
What is 100 mm in in?
100 mm = 3.937008 in.
What is 12 mm in in?
12 mm = 0.47244094 in.
What is 14 mm in in?
14 mm = 0.5511811 in.
What is 16 mm in in?
16 mm = 0.62992126 in.
What is 18 mm in in?
18 mm = 0.70866142 in.
What is 24 mm in in?
24 mm = 0.94488189 in.
Is a millimeter bigger than a inch?
No. A millimeter is smaller — one millimeter equals 0.03937008 inches, while one inch equals 25.4 millimeters.