Convert Inches (in) to Millimeters (mm)
Enter a value below to convert Inches (in) to Millimeters (mm).
Conversion:
1 Inches (in) = 25.4 Millimeters (mm)
How to Convert Inches (in) to Millimeters (mm)
1 in = 25.4 mm
1 mm = 0.03937007874 in
Example: convert 15 Inches (in) to Millimeters (mm):
25 in = 635 mm
Inches (in) to Millimeters (mm) Conversion Table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.01 in | 0.254 mm |
| 0.1 in | 2.54 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
| 1000 in | 25400 mm |
Inches (in)
Definition
An inch (in) is an imperial unit of length equal to 1/12 of a foot or exactly 25.4 millimeters.
History
The inch has ancient origins, historically defined as the width of a man's thumb. It was standardized internationally in 1959 to exactly 25.4 mm. The word 'inch' derives from the Latin 'uncia' meaning one-twelfth.
Current use
Inches are widely used in the United States, Canada, and the United Kingdom for everyday measurements: screen sizes, paper dimensions, height measurements, pipe diameters, and construction specifications.
Millimeters (mm)
Definition
A millimeter (mm) is a metric unit of length equal to one thousandth of a meter (0.001 m). There are 10 millimeters in a centimeter.
History
The millimeter derives from the metric system established in France in 1795. It became widely used in engineering and manufacturing as precision requirements increased during the Industrial Revolution.
Current use
Millimeters are standard in engineering drawings, precision machining, medical measurements (tumor sizes), rainfall measurement, and small-scale construction specifications worldwide.