Convert inches to millimeters and millimeters to inches with precise, unit-accurate formulas. No PPI required.
Formula: mm = inches × 25.4
Formula: inches = mm ÷ 25.4
| Inches (in) | Millimeters (mm) |
|---|---|
| 1.00 in | 25.4000 mm |
| 2.00 in | 50.8000 mm |
| 2.50 in | 63.5000 mm |
| 4.00 in | 101.6000 mm |
| 8.50 in (US Letter width) | 215.9000 mm |
| 11.00 in (US Letter height) | 279.4000 mm |
Constant relationship: 1 inch = 25.4 mm. This doesn’t depend on display PPI or DPI.
Common Inches to MM sizes…
0.1 inch to mm is 2.54 mm
0.25 inch to mm is 6.35 mm
0.3 inches to mm is 7.62 mm
0.5 inch to millimeters is 12.7 mm
0.75 inch to mm is 19.05 mm
1 inch to millimeters is 25.4 mm
1.2 inches to mm is 30.48 mm
1.5 inch to mm is 38.1 mm
Common Inch to MM sizes…
2 inches to mm is 50.8 mm
2.5 inch to millimeters is 63.5 mm
3 inches into mm is 76.2 mm
3.5 inch to mm is 88.9 mm
4 inches to millimeters is 101.6 mm
4.5 inch to mm is 114.3 mm
5 inches into mm is 127 mm
6 inch to millimeters is 152.4 mm
Common Inch MM sizes…
7 inches to mm is 177.8 mm
8 inch to millimeters is 203.2 mm
8.5 inches to mm is 215.9 mm
9 inch to mm is 228.6 mm
10 inches to mm is 254 mm
11 inch to millimeters is 279.4 mm
12 inches to mm is 304.8 mm
14 inch to millimeters is 355.6 mm
Common Inch to MM sizes…
15 inch to mm is 381 mm
16 inches to mm is 406.4 mm
18 inch to mm is 457.2 mm
20 inches to mm is 508 mm
22 inch to millimeters is 558.8 mm
24 inches to mm is 609.6 mm
30 inch to millimeters is 762 mm
36 inches to mm is 914.4 mm
Here are some of the frequently asked questions about conversions…
If you work with CSS, responsive layouts, or UI design, these converters will help you switch between different units quickly.
Each tool solves a specific use case – whether you're adjusting font sizes, spacing, or converting print measurements to screen pixels. Explore the full set below to speed up your workflow…
PX to CM Converter – Convert pixels into centimeters for print-friendly layouts and accurate sizing.
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REM to PX Converter – Convert rem values back to fixed pixel units for precise layout control.
PX to Inches Converter – Convert pixels into inches for print sizes or physical measurements.
Inches to PX Converter – Convert inches into pixel dimensions based on standard screen density.
MM to PX Converter – Convert millimeters to pixels for UI, print, and product mockups.
PX to MM Converter – Convert pixels to millimeters with accurate unit mapping.
MM to Inches Converter – Convert millimeters into inch values for sizing and print design.
Inches to MM Converter – Convert inches into millimeters for exact physical measurements.
VW to PX Converter – Convert viewport-width units into pixel values for responsive layouts.
PX to VW Converter – Convert pixel values into viewport-width units for fluid UI scaling.
The Inches to MM Converter is one of those deceptively simple tools that solves real, everyday problems for designers, developers, engineers, and product teams. It translates imperial measurements into the metric system with perfect precision, helping you maintain consistency across print, digital, UI, CAD, and manufacturing workflows.
As an agency founder, I know how essential accurate unit conversions are. A small sizing mistake can impact printing, manufacturing, or layout alignment—so tools like this are part of our daily workflow. Whether you’re designing packaging, preparing print materials, sizing physical assets, or converting measurements for CAD, this tool gives you the precise mm value you need instantly.
Bookmark this page, share it with your team, and make the Inches to MM Converter a reliable part of your design toolkit.
Cheers,
Kuldeep