Convert Millimeters to Inches

Enter your millimeter value in the form below to get the value calculated in inches.

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1 mm = 0.03937 in

How to Convert Millimeters to Inches Using an Easy Conversion Formula

Tape measures can be used to measure units of length, and a calculator can be used to convert to another unit

Convert millimeters to inches with this simple formula:

inches = millimeters × 0.03937

Converting a millimeter length measurement to an inch measurement involves multiplying your length by the conversion ratio to find the result. A millimeter is equal to 0.03937 inches, so to convert simply multiply by 0.03937.

For example:
5 mm = (5 × 0.03937) = 0.19685"

Our inch fraction calculator can add millimeters and inches together and it also automatically converts the results to both imperial and metric values.

Millimeters and inches are both units used to measure length. Learn more about length and find more length measurement conversion calculators. A millimeter is a metric measurement and can be abbreviated as mm, for example 1 mm. An inch is an imperial measurement and can be abbreviated as in, for example 1 in. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

Millimeter is spelled millimetre internationally, and it is equal in length to .1 centimeters, 1000 micrometers, or 5/127 inch. They are represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a dime is 1.35mm.

To get an idea of how small a millimeter is, a dime is 1.35mm thick.

The actual length of an inch has varied because of variances of the length of a foot. Throughout history it has been equal to 1/12 - 1/16 of a foot, but there are now exactly 12 inches in a foot. In 1959 the world agreed to the exact length of the national yard, .9144 meters. As such a foot is equal to .3048 meters and an inch is equal to 2.54 centimeters.

A quarter is .955" in diameter, which is just smaller than 1"

The standard ruler has 12", and metric combinations have 30 cm. Inches are also often measured using tape measures which commonly come in lengths from 6' - 35'. Other types of measuring devices include scales, calipers, measuring wheels, micrometers, yardsticks, and even lasers.

We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs. If you need a ruler you can also download and print our free printable rulers which include both imperial and metric measurements.

millimeters and inches are units used to measure length
Convert Inches to Millimeters

Millimeter Measurements and Equivalent Inch Conversions

Common millimeter values converted to the equivalent inch value
Millimeters Inches
1 mm 0.03937"
2 mm 0.07874"
3 mm 0.11811"
4 mm 0.15748"
5 mm 0.19685"
6 mm 0.23622"
7 mm 0.275591"
8 mm 0.314961"
9 mm 0.354331"
10 mm 0.393701"
11 mm 0.433071"
12 mm 0.472441"
13 mm 0.511811"
14 mm 0.551181"
15 mm 0.590551"
16 mm 0.629921"
17 mm 0.669291"
18 mm 0.708661"
19 mm 0.748031"
20 mm 0.787402"
21 mm 0.826772"
22 mm 0.866142"
23 mm 0.905512"
24 mm 0.944882"
25 mm 0.984252"
26 mm 1.0236"
27 mm 1.063"
28 mm 1.1024"
29 mm 1.1417"
30 mm 1.1811"
31 mm 1.2205"
32 mm 1.2598"
33 mm 1.2992"
34 mm 1.3386"
35 mm 1.378"
36 mm 1.4173"
37 mm 1.4567"
38 mm 1.4961"
39 mm 1.5354"
40 mm 1.5748"

More Length Conversions

Convert to Miles Length
1 mm is equal to 6.2137E-7 miles
Convert to Yards Length
1 mm is equal to 0.001094 yards
Convert to Feet Length
1 mm is equal to 0.003281 feet
Convert to Kilometers Length
1 mm is equal to 1.0E-6 kilometers
Convert to Meters Length
1 mm is equal to 0.001 meters
Convert to Centimeters Length
1 mm is equal to 0.1 centimeters
Convert to Micrometers Length
1 mm is equal to 1,000 micrometers
Convert to Nanometers Length
1 mm is equal to 1,000,000 nanometers