Convert mm to inches (2024)

Convert mm to inches (1)

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Please provide values below to convert millimeter [mm] to inch [in], or vice versa.


Millimeter

Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI). It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458 000 of a second.

History/origin: The milli- prefix is one of many metric prefixes. It indicates one thousandth of the base unit, in this case the meter. The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar. In 2019, the meter has been re-defined based on the changes made to the definition of a second.

Inch

Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. There are 12 inches in a foot and 36 inches in a yard.

History/origin: The term "inch" was derived from the Latin unit "uncia" which equated to "one-twelfth" of a Roman foot.

There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.

Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.

Millimeter to Inch Conversion Table

Millimeter [mm]Inch [in]
0.01 mm0.0003937008 in
0.1 mm0.0039370079 in
1 mm0.0393700787 in
2 mm0.0787401575 in
3 mm0.1181102362 in
5 mm0.1968503937 in
10 mm0.3937007874 in
20 mm0.7874015748 in
50 mm1.968503937 in
100 mm3.937007874 in
1000 mm39.3700787402 in

How to Convert Millimeter to Inch

1 mm = 0.0393700787 in
1 in = 25.4 mm

Example: convert 15 mm to in:
15 mm = 15 × 0.0393700787 in = 0.5905511811 in

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Convert Millimeter to Other Length Units

mm to m

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mm to cm

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mm to feet

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Millimeter to Break

Millimeter to Exameter

Millimeter to Petameter

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Millimeter to Dekameter

Millimeter to Micron

Millimeter to Picometer

Millimeter to Femtometer

Millimeter to Attometer

Millimeter to Megaparsec

Millimeter to Kiloparsec

Millimeter to Parsec

Millimeter to Astronomical Unit

Millimeter to League

Millimeter to Nautical League (UK)

Millimeter to Nautical League (int.)

Millimeter to League (statute)

Millimeter to Nautical Mile (UK)

Millimeter to Nautical Mile (international)

Millimeter to Mile (statute)

Millimeter to Mile (US Survey)

Millimeter to Mile (Roman)

Millimeter to Kiloyard

Millimeter to Furlong

Millimeter to Furlong (US Survey)

Millimeter to Chain

Millimeter to Chain (US Survey)

Millimeter to Rope

Millimeter to Rod

Millimeter to Rod (US Survey)

Millimeter to Perch

Millimeter to Pole

Millimeter to Fathom

Millimeter to Fathom (US Survey)

Millimeter to Ell

Millimeter to Foot (US Survey)

Millimeter to Link

Millimeter to Link (US Survey)

Millimeter to Cubit (UK)

Millimeter to Hand

Millimeter to Span (cloth)

Millimeter to Finger (cloth)

Millimeter to Nail (cloth)

Millimeter to Inch (US Survey)

Millimeter to Barleycorn

Millimeter to Mil

Millimeter to Microinch

Millimeter to Angstrom

Millimeter to A.u. Of Length

Millimeter to X-unit

Millimeter to Fermi

Millimeter to Arpent

Millimeter to Pica

Millimeter to Point

Millimeter to Twip

Millimeter to Aln

Millimeter to Famn

Millimeter to Caliber

Millimeter to Centiinch

Millimeter to Ken

Millimeter to Russian Archin

Millimeter to Roman Actus

Millimeter to Vara De Tarea

Millimeter to Vara Conuquera

Millimeter to Vara Castellana

Millimeter to Cubit (Greek)

Millimeter to Long Reed

Millimeter to Reed

Millimeter to Long Cubit

Millimeter to Handbreadth

Millimeter to Fingerbreadth

Millimeter to Planck Length

Millimeter to Electron Radius (classical)

Millimeter to Bohr Radius

Millimeter to Earth's Equatorial Radius

Millimeter to Earth's Polar Radius

Millimeter to Earth's Distance From Sun

Millimeter to Sun's Radius

Convert mm to inches (2024)

FAQs

How many mm is 1 ⁄ 4 inch? ›

6.35 mm

Is 12 mm the same as 1 inch? ›

11mm = almost 7/16 inch. 12mm = almost 15/32 inch (= almost 1/2 inch)

Is 20 mm the same as 1 inch? ›

Answer: 20 millimeters is equal to approximately 0.7874 inches. Here's how the calculation is done: Given Measurement: 20 mm. Conversion Factor: 1 inch = 25.4 mm.

How many mm is 1 ⁄ 8 inch? ›

To convert 1/8 inch to mm, divide 1 by 8 to convert the fraction to a decimal. Then, multiply that by 25.4 since there are 25.4 millimeters in one inch. That's the formula that our calculator uses to find that 1/8 inch to millimeters is 3.175 mm.

How many mm is 1 ⁄ 2 inch? ›

Inches to millimeters conversion table
Inches (")Millimeters (mm)
1/4 ″6.35 mm
1/2 ″12.7 mm
1 ″25.4 mm
2 ″50.8 mm
23 more rows

How big is 10 mm compared to 1 inch? ›

Millimeter Conversion Chart
MMApproximate Size In InchesExact Size In Inches
10mmLittle over 3/8 Inch0.39370 Inches
11mm7/16 Inch0.43307 Inches
12mmJust short of 1/2 Inch0.47244 Inches
13mmLittle over 1/2 Inch0.51181 Inches
21 more rows

What does 10 mm look like? ›

To give you an idea of what 10 millimeters look like, it's roughly the width of a standard paperclip or about the diameter of a large staple. It's a very small measurement, and often objects of this size are challenging to perceive with the naked eye.

What is the actual size of 5 mm? ›

For Americans, 5mm is little less than 1/4 of an inch, and an inch is the length of a man's thumb, the conventional definition of an inch.

How thick is 15 mm in inches? ›

5/8 inch

What is 1 inch in mm exactly? ›

One inch is equal to 25.4 millimeters.

How thick is 7 mm in inches? ›

Millimeters to inches conversion table
Millimeters (mm)Inches (") (decimal)Inches (") (fraction)
7 mm0.2756 ″9/32 ″
8 mm0.3150 ″5/16 ″
9 mm0.3543 ″23/64 ″
10 mm0.3937 ″25/64 ″
17 more rows

Is 30 mm equal to 1 inch? ›

How do you convert millimeters to inches? Since there are 25.4 millimeters in one inch, the length in inches is equal to millimeters divided by 25.4.

How big is 1 mm actual size? ›

One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch.

How big is 15 mm on a ruler? ›

Millimeter Conversion Chart
MMApproximate Size In InchesExact Size In Inches
14mm9/16 Inch0.55118 Inches
15mmJust short of 5/8 Inch0.59055 Inches
16mm5/8 Inch0.62992 Inches
17mmJust short of 11/16 Inch0.66929 Inches
21 more rows

What is bigger, 5mm or 1/4 inch? ›

So, 1/4 inch is approximately 6.35 millimeters, not 5mm. There is a slight difference between the two measurements, which can be significant when precision is required, especially in fields such as engineering, construction, and manufacturing.

What is 1mm as an inch? ›

1mm = (1/25.4)″ = 0.03937007874″
Millimetre (mm)Inch ( " )
6.5mm1/4"
7mm9/32"
8.0mm5/16"
9.5mm3/8"
15 more rows
Jul 7, 2021

How many mm is a quarter? ›

It has a diameter of 0.955 inch (24.26 mm) and a thickness of 0.069 inch (1.75 mm).

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