1 Millimeter equals 0.0393701 Inches.
| Millimeter (mm) | Inch (in) |
|---|---|
| 0.001 mm | 3.93701e-5 in |
| 0.01 mm | 0.000393701 in |
| 0.1 mm | 0.00393701 in |
| 1 mm | 0.0393701 in |
| 2 mm | 0.0787402 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.93701 in |
| 500 mm | 19.685 in |
| 1,000 mm | 39.3701 in |
To convert Millimeters to Inches, multiply the value by 0.0393701. This factor comes from the ratio of the two units' definitions: one Millimeter equals 0.0393701 Inches.
For example: 1 Millimeter = 0.0393701 Inches, and 10 Millimeters = 0.393701 Inches.
To convert in the reverse direction — from Inches to Millimeters — multiply by 25.4.
The millimeter (mm) is one thousandth of a meter and one of the most familiar metric units in daily life. The thickness of a credit card is about 0.76 mm; a standard fingernail grows roughly 3 mm per month; and the gap a mechanic sets on a spark plug is typically between 0.6 and 1.8 mm. It is the smallest unit on most everyday rulers and measuring tapes.
In meteorology, rainfall is universally measured in millimeters (or inches in the United States). One millimeter of rain means one liter of water fell on every square meter of ground — a fact that connects the unit neatly to the liter and the square meter. Snowfall depth is also recorded in millimeters in most countries.
Millimeters are the lingua franca of engineering drawings worldwide. Even in countries that still use inches for road signs and grocery shopping, technical standards for machine parts, plumbing fittings, and screw threads are overwhelmingly written in millimeters. The ISO metric fastener system, for example, specifies thread pitch and bolt diameter entirely in millimeters.
The inch is a unit of length in the imperial and US customary systems, historically defined as the width of a man's thumb at the base of the nail. Other traditions rooted it in three barleycorns laid end to end. The word itself comes from the Latin "uncia," meaning one-twelfth — because the inch was one-twelfth of a foot. Today it is defined exactly as 25.4 millimeters.
Inches remain the primary unit of length for everyday measurement in the United States, and are still used alongside metric units in the United Kingdom and Canada. Screen sizes worldwide — televisions, laptops, smartphones, monitors — are almost universally described in diagonal inches, even in countries that otherwise use the metric system. Similarly, photographic film was measured in inches (35 mm film being 1.38 inches wide).
Pipe diameters and lumber dimensions in the US and Canada are specified in inches, though the "nominal" inch size of lumber rarely matches its actual measured dimension — a piece of "2×4" lumber is actually about 1.5 × 3.5 inches. Aviation altimeters in the US report barometric pressure in inches of mercury (inHg). The inch's persistence in a metric world speaks to the deep entrenchment of legacy standards in established industries.
1 Millimeter equals 0.0393701 Inches.
To convert Millimeters to Inches, multiply by 0.0393701. For example, 1 Millimeter = 0.0393701 Inches.
1 Inch equals 25.4 Millimeters.