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

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Millimeter to Picometer

Millimeter to Femtometer

Millimeter to Attometer

Millimeter to Kiloparsec

Millimeter to Parsec

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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

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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

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Convert mm to inches (2024)

FAQs

Convert mm to inches? ›

How can you estimate the conversion from millimeters to inches? There are 25.4 millimeters in an inch. For a quick conversion and estimation, we can divide the length in millimeters by 25. For example, 100 mm is approximately equal to 100 ÷ 25 = 4 inches.

How do you convert millimeters into inches? ›

To convert millimeters to inches, simply divide the millimeters by 25.4.

What is 1 inch in mm exactly? ›

1 inch = 25.4 millimeters. 1 inch = 2.54 centimeters. 1 centimeter = 10 millimeters. 100 centimeters = 1 meter.

Is 30 mm one 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.

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? ›

3.18 mm

What is the proper conversion factor to convert inches to millimeters? ›

To convert inches to mm, you must multiply the unit by 25.4. For instance, if you have to convert 10 inches to mm, you need to multiply 10 with 25.4. Here are some popular metrics related to 1 inch.

How many mm is 1 ⁄ 4 inch? ›

To convert 1/4 inch to mm, divide 1 by 4 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 1/4 inch to millimeters is 6.35 mm.

What mm is close to an inch? ›

25mm = almost 1 inch.

How do you divide mm to inches? ›

Ans : Because one inch is 25.4 millimetres long, the length in inches is millimetres divided by 25.4. The length divided by 25.4 is the formula for converting millimetres to inches.

How wide is 50 mm in inches? ›

MM to Inches Formula and Example
MMInches
50 MM is equal to 50* 0.0391.969 Inches
75 MM is equal to 75* 0.0392.953 Inches
100 MM is equal to 100* 0.0393.937 Inches
150 MM is equal to 150* 0.0395.906 Inches
5 more rows

How thick is 10 mm in inches? ›

The conversion factor between millimeters and inches is 0.0393701, meaning that 1 millimeter is approximately equal to 0.0393701 inches. Therefore, 10 millimeters are approximately equal to 0.393701 inches.

What does 1mm look like? ›

Common items that can be used to show tumor size in mm include: a sharp pencil point (1 mm), a new crayon point (2 mm), a pencil-top eraser (5 mm), a pea (10 mm), a peanut (20 mm), and a lime (50 mm).

What does 5 mm look like? ›

5 mm is a very small length measurement, roughly equivalent to 0.2 inches. It is about the thickness of a pencil lead or the width of a small paperclip. It is roughly the size of the end of a pinky finger. It is small enough that it can be difficult to see with the naked eye.

How do you convert millimeters to inches? ›

How do I calculate mm to inches accurately? One millimeter is approximately equal to 0.0394 inches. There are 25.4 millimeters in an inch. To convert millimeters into inches, divide the length in millimeters by 25.4.

How big is 1 mm actual size? ›

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

Is 10 mm the same as 1 inch? ›

10mm = just over 3/8 inch. 11mm = almost 7/16 inch.

What size is 32mm in inches? ›

Example #2: If an item measures 5mm wide... so 5mm is about 3/16" wide. Example #3: If an item measures 32mm tall... so 32mm is about 1-1/4" tall.

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