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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Millimeter to Nautical Mile (international)

Millimeter to Mile (statute)

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Millimeter to Mile (Roman)

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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)

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Millimeter to Famn

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Millimeter to Centiinch

Millimeter to Ken

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Millimeter to Roman Actus

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Millimeter to Vara Conuquera

Millimeter to Vara Castellana

Millimeter to Cubit (Greek)

Millimeter to Long Reed

Millimeter to Reed

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Convert mm to inches (2024)

FAQs

How many mm is 1 ⁄ 4 inch? ›

6.35 mm

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.

What is the conversion factor for mm to inches? ›

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 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)
1/2 ″12.7 mm
1 ″25.4 mm
2 ″50.8 mm
3 ″76.2 mm
23 more rows

How big is 10 mm compared to 1 inch? ›

10mm = just over 3/8 inch. 11mm = almost 7/16 inch. 12mm = almost 15/32 inch (= almost 1/2 inch) 13mm = just over 1/2 inch.

What does 5 mm look like? ›

Tumor sizes are often measured in millimeters (mm) or centimeters. 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).

Is 25 mm longer than 1 inch? ›

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

How wide is 50 mm in inches? ›

MM to Inches Formula and Example
MMInches
20 MM is equal to 20* 0.0390.787 Inches
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
5 more rows

What is 1 inch equal to in mm? ›

1 Inches = 25.4 MM.

What is 20 mm in inches to inches? ›

To convert millimeters (mm) to inches, you can use the conversion factor that 1 inch is equal to 25.4 millimeters. Therefore, 20 mm is approximately 0.7874 inches.

How large is 1mm? ›

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.

What size is 4 mm? ›

Millimeters to Inches Conversion Chart
MillimetersInches
4 mm0.1575"
5 mm0.1969"
6 mm0.2362"
7 mm0.2756"
30 more rows

What is 1 inch in mm exactly? ›

In summary, 1 inch is equal to 25.4 millimeters.

How close is 5mm to 1 4 inch? ›

4mm = 5/32 inch (= a bit over 1/8 inch) 5mm = just over 3/16 inch. 6mm = almost 1/4 inch. 7mm = almost 9/32 inch (= a bit over 1/4 inch)

Is a quarter of an inch 5 mm? ›

A quarter of an inch is 6.35mm.

What is 1mm as an inch? ›

1 MM = 0.0393701 Inches.

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