Millimeters to inches converter
Provide a length below to convert millimeters (mm) to inches (in). For the reverse direction, visit the inches to millimeters converter.
1 millimeter equals approximately 0.0393701 inches. This conversion is derived from the exact relationship where 1 inch equals 25.4 millimeters.
To convert millimeters to inches, divide the measurement in millimeters by 25.4. To convert inches to millimeters, multiply the value in inches by 25.4.
Millimeter
Definition: A millimeter (symbol: mm) is a metric length unit equal to one-thousandth of a meter, or 0.001 meters. It is part of the International System of Units (SI).
History: The millimeter derives from the meter with the prefix "milli-" denoting one-thousandth. This systematic approach to units was established with the development of the metric system in France during the late 18th century.
Current use: Millimeters are widely used worldwide for small-scale measurements, particularly in engineering, manufacturing, and technical drawings. They provide precision for dimensions that require accuracy beyond what centimeters offer.
Inch
Definition: An inch (symbol: in) is a length unit in the imperial and US customary systems. It is defined as exactly 25.4 millimeters, with 12 inches forming one foot.
History: The inch has historical roots dating back to ancient civilizations. Various definitions existed until 1959 when the international inch was standardized at exactly 25.4 millimeters to ensure consistency across nations.
Current use: Inches remain commonly used in the United States, Canada, and the United Kingdom for everyday measurements, particularly in construction, manufacturing, and consumer products. They also appear in screen sizes and hardware dimensions globally.
| Millimeter [mm] | Inch [in] |
|---|---|
| 0.01 mm | 0.000394 in |
| 0.1 mm | 0.003937 in |
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 20 mm | 0.787402 in |
| 50 mm | 1.968504 in |
| 100 mm | 3.937008 in |
| 1000 mm | 39.370079 in |