Inches to mm ►
* The inches fraction result is rounded to the nearest 1/64 fraction.
How to convert millimeters to inches
1 millimeter is equal to 0.03937007874 inches:
1mm = (1/25.4)″ = 0.03937007874″
The distance d in inches (″) is equal to the distance d in millimeters (mm) divided by 25.4:
d(″) = d(mm) / 25.4
Example
Convert 20 mm to inches:
d(″) = 20mm / 25.4 = 0.7874″
How many inches in a millimeter
One millimeter is equal to 0.03937 inches:
1mm = 1mm / 25.4mm/in = 0.03937in
How many millimeters in an inch
One inch is equal to 25.4 millimeters:
1in = 25.4mm/in × 1in = 25.4mm
How to convert 10mm to inches
Divide 10 millimeters by 25.4 to get inches:
10mm = 10mm / 25.4mm/in = 0.3937in
Millimeters to inches conversion table
The fraction inches are rounded to 1/64 resolution.
| 0.01 mm | 0.0004 ″ | 0 ″ |
| 0.1 mm | 0.0039 ″ | 0 ″ |
| 1 mm | 0.0394 ″ | 3/64 ″ |
| 2 mm | 0.0787 ″ | 5/64 ″ |
| 3 mm | 0.1181 ″ | 1/8 ″ |
| 4 mm | 0.1575 ″ | 5/32 ″ |
| 5 mm | 0.1969 ″ | 13/64 ″ |
| 6 mm | 0.2362 ″ | 15/64 ″ |
| 7 mm | 0.2756 ″ | 9/32 ″ |
| 8 mm | 0.3150 ″ | 5/16 ″ |
| 9 mm | 0.3543 ″ | 23/64 ″ |
| 10 mm | 0.3937 ″ | 25/64 ″ |
| 20 mm | 0.7874 ″ | 25/32 ″ |
| 30 mm | 1.1811 ″ | 1 3/16 ″ |
| 40 mm | 1.5784 ″ | 1 37/64 ″ |
| 50 mm | 1.9685 ″ | 1 31/32 ″ |
| 60 mm | 2.3622 ″ | 2 23/64 ″ |
| 70 mm | 2.7559 ″ | 2 3/4 ″ |
| 80 mm | 3.1496 ″ | 3 5/32 ″ |
| 90 mm | 3.5433 ″ | 3 35/64 ″ |
| 100 mm | 3.9370 ″ | 3 15/16 ″ |
Inches to mm ►
See also
- Inches to mm
- cm to inches
- Inches to cm
Definitions
Table of contents
Unit of millimeter
The millimeter or millimetre [mm] is a unit of length from the SI system of units. It is defined as one thousandth (1/1000) of the meter. The meter [m], is the base unit of length in SI system, and is currently established as the distance traveled by light in vacuum in \frac{1}{299\,792\,458} seconds.
Common multiple and fraction units of the metre are defined through the decimal SI prefixes, as presented in the following table:
| Nanometer | nm | 10-9 |
| Micrometer | μm | 10-6 |
| Millimeter | mm | 0.001 |
| Centimeter | cm | 0.01 |
| Hectometer | hm | 100 |
| Kilometer | km | 1000 |
| Megameter | Mm | 106 |
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Unit of inch
Inch [in] is a unit of length in the Imperial and US customary system of units. It was historically conceived as the length of 3 barley-corns. Today, it is defined through the meter SI unit as: 1 in = 0.0254 m (= 2.54 cm = 25.4 mm).
Multiple units of the inch are defined as shown in the table:
| Foot | ft | 12 |
| Yard | yd | 36 |
| Mile | mi | 63360 |
How to convert inches to mm
- Multiply distance in [in] with 25.4
- The result is the distance in mm
For example, to convert 1/2 inches to mm, do: 0.5\times 25.4 = 12.7 mm
How to convert mm to inches
- Divide distance in [mm] by 25.4
- The result is the distance in inches
For example, to convert 150 mm to inches, do: 150/25.4 \approx 5.91 inches
Conversion table from mm to inches
In the following table some typical distances in millimeters are converted to inches:
| 0.5 | 0.01969 |
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.1181 |
| 5 | 0.1969 |
| 10 | 0.3937 |
| 12 | 0.4724 |
| 20 | 0.7874 |
| 30 | 1.181 |
| 40 | 1.575 |
| 50 | 1.969 |
| 100 | 3.937 |
| 200 | 7.874 |
| 300 | 11.81 |
| 400 | 15.75 |
| 500 | 19.69 |
| 600 | 23.62 |
| 700 | 27.56 |
| 800 | 31.5 |
| 900 | 35.43 |
| 1000 | 39.37 |
Conversion table from inches to mm
In the following table some typical distances in inches are converted to millimeters:
| 0.125 | 3.175 |
| 0.25 | 6.35 |
| 0.375 | 9.525 |
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 5 | 127 |
| 10 | 254 |
| 12 | 304.8 |
| 20 | 508 |
| 30 | 762 |
| 50 | 1270 |