Conversion Form

IN
MM

About the Unit

Inch (in): The inch (in) is an absolute unit of measurement representing a physical inch, equal to 2.54 cm. In CSS, using the inch unit is particularly useful when you are creating documents or layouts for print, such as paper templates or physical charts. Using the in unit ensures that the layout will be printed with the exact dimensions specified, regardless of the screen resolution or the device used to view the page. The inch is a standard measure in many printing systems, so it is crucial when you need to create documents that will be printed or exported to other physical formats like PDFs. However, for digital web design, relative units (like px, em, or rem) usually offer greater flexibility, though the in unit may be the best choice for documents that need to be converted to physical formats.

Pro Tip: in → mm

1in = 25.4mm. Convert inches to mm for precise print measurements.

Quick Reference: Unit Conversion by Tens

INMM
10in254mm
20in508mm
30in762mm
40in1016mm
50in1270mm
60in1524mm
70in1778mm
80in2032mm
90in2286mm
100in2540mm
110in2794mm
120in3048mm
130in3302mm
140in3556mm
150in3810mm
160in4064mm
170in4318mm
180in4572mm
190in4826mm
200in5080mm
210in5334mm
220in5588mm
230in5842mm
240in6096mm
250in6350mm

Live Unit Preview

See how different CSS units affect the size of the box below:

10px

10rem

10em

10%

10vw

10vh

Common Mistake

Be cautious when mixing in and mm without testing on different screen sizes.

Real Code Example

/* Mobile-first card with in → mm */
.card {
  padding: 0in;     /* undefinedmm */
  font-size: 1.5rem;
  width: min(90vw, 40ch);
}
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Keyboard Shortcuts

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  • Esc: Reset values

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