because there are 25.4 millimeter in one inch<1>, the length in millimeters is equal to inches times by 25.4. Thus, the formula to transform inches to millimeter is the length multiplied through 25.4.

You are watching: Convert 12 inches to millimeters (to the nearest tenth).

How many Millimeters room in an Inch?

There space 25.4 millimeter in one inch, which is why we use this value in the formula above.

1" = 25.4 mm

ours inch portion calculator can add inches and also millimeters together and it additionally automatically switch the outcomes to us customary, imperial and also SI metric values.

Inches and millimeters room both units used to measure up length. Keep analysis to learn more about every unit the measure.


What is an Inch?

An customs is a unit that linear length measure equal to 1/12 of a foot or 1/36 of a yard. Because the international yard is legally defined to be equal to precisely 0.9144 meters, one inch is same to 2.54 centimeters.<2>

The customs is a us customary and imperial unit that length. Inches deserve to be abbreviated as in; because that example, 1 inch deserve to be written as 1 in.

inch can additionally be denoted utilizing the symbol, otherwise well-known as a double-prime. Frequently a double-quote (") is used instead of a double-prime for convenience. A double-prime is commonly used come express 1 in together 1″.


The typical ruler has actually 12", and also is a typical measuring tool for measuring inches. They are also often measured making use of tape measures, which commonly come in lengths indigenous 6" - 35". Other types of measuring gadgets include scales, calipers, measure wheels, micrometers, yardsticks, and even lasers.

What is a Millimeter?

One millimeter is same to one-thousandth (1/1,000) that a meter, i beg your pardon is characterized as the street light travels in a vacuum in a 1/299,792,458 2nd time interval.

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The millimeter, or millimetre, is a many of the meter, i beg your pardon is the SI basic unit because that length. In the metric system, "milli" is the prefix because that 10-3. Millimeters deserve to be abbreviated together mm; for example, 1 millimeter have the right to be composed as 1 mm.

millimeters are frequently represented by the the smallest ticks on most metric rulers. To gain a reference suggest of the size, the thickness of a us dime is 1.35mm.<3>

we recommend making use of a leader or tape measure up for measure up length, which have the right to be discovered at a neighborhood retailer or house center. Rulers are obtainable in imperial, metric, or combination with both values, for this reason make certain you gain the correct form for her needs.

require a ruler? try our complimentary downloadable and also printable rulers, which encompass both imperial and metric measurements.

Inch to Millimeter switch Table

Inch dimensions converted to millimeter customs millimeters
1" 25.4 mm
2" 50.8 mm
3" 76.2 mm
4" 101.6 mm
5" 127 mm
6" 152.4 mm
7" 177.8 mm
8" 203.2 mm
9" 228.6 mm
10" 254 mm
11" 279.4 mm
12" 304.8 mm
13" 330.2 mm
14" 355.6 mm
15" 381 mm
16" 406.4 mm
17" 431.8 mm
18" 457.2 mm
19" 482.6 mm
20" 508 mm
21" 533.4 mm
22" 558.8 mm
23" 584.2 mm
24" 609.6 mm
25" 635 mm
26" 660.4 mm
27" 685.8 mm
28" 711.2 mm
29" 736.6 mm
30" 762 mm
31" 787.4 mm
32" 812.8 mm
33" 838.2 mm
34" 863.6 mm
35" 889 mm
36" 914.4 mm
37" 939.8 mm
38" 965.2 mm
39" 990.6 mm
40" 1,016 mm


National institute of Standards and also Technology, SI devices - Length, institute of Standards and also Technology, checking the Net components of Packaged Goods, Handbook 133 - 2019 Edition, says Mint, Coin Specifications,