Online Conversion of Inch To Mm

1 Inch is equal to 25.40 Millimeter

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Inch and millimeters both belong to the standards imperial system and metric measurement system respectively. You can create a conversion between inch to mm with the help of a simple mathematical formula. One should be mindful of the fact that the metric system is indicated in units of 10, and define the gap between millimeters, centimeters and meters. This factor makes it easy to create a conversion of inches to mm. In this blog, we will walk you through the formula and equation of conversion for inches to mm along with the history and current use of these measurement units.

What are Inches?

Inch is a unit of the United States and British Imperial Customary measure, equivalent to 1/36 of a yard. This measurement turns out to be derived from the Old English ynce or ince which came from the Latin unit uncia. It was sourced from “one-twelfth” of a Roman foot, or pes. Moreover, the Latin word uncia was derived from another English unit named ounce.

  • Current Use of Inches

Inch is a popular measurement unit, widely used in the United States, Canada and even in the United Kingdom. This metric is a significant part of continental Europe. Inch is informally used for measuring various electronic devices, including display screens. Moreover, this metric is also popular in Asian countries like Japan, India and so on.

The international standard symbol is denoted by a double prime. The foot is represented by a single prime. For example, three feet and two inches can be written as 6’4”. This is comparable to how the prime and double prime symbols are used in the first and second cuts of the degree.

  • History of Inches

King David l of Scotland defined old English ynceI about 1150 as the breadth of a man’s thumb at the base of the nail. In order to maintain the consistency of this measurement unit, it was usually achieved by adding the thumb’s breadth of three men: one large, one medium and one small. After adding the numbers it was divided by three.

The earliest reference that we look up to is from England. This memory of inches comes from the Laws of Æthelberht, back in the early 7th century. The Textus Roffensis form 1120 talks about various depths including shilling, two shillings, one inch and two inches. Moreover, it is a single sustaining manuscript to feature this information.

In the UK and a few other countries of the British Commonwealth, the definition of an inch was recapitulated in terms of Imperial Standard Yard. Later in 1866, the USA adopted the measurement factor to define an inch. In this definition, 1 inch was equivalent to 39.37 inches. This definition resulted in the inch being expressed as 25.4000508 mm

In addition, the British Standard Institution accepted the measurement value of an inch as 1 inch equivalent to 25.4 mm in 1930. Moreover, the American Standard Association also followed in 1933. By the end of 1935, this measurement became the standard unit of measurement in around 16 countries.

What are Millimeters?

The Millimeter is a measurement unit belonging to the International System of Units. It is defined as one-thousandth of a meter. Its expression in terms of meters makes it more feasible because of being a SI Unit. Since an inch is officially defined as 25.4 mm, a millimeter is equivalent to 5/127 (0.03937) of an inch.

  • Current Use of Millimeters

The millimeter is the smallest unit of measurement in the metric system. Moreover, it is used to measure wavelengths and to measure something as thin as paper or hair. This unit of measurement is primarily used in the metric system. Refer to the information below to get a better understanding of the current use of millimeters:

    • The smallest unit for measuring distance can be measured up to 0.02 to 0.04 mm.
    • The wavelength of a microwave is about 1 mm and the frequency is about 300 GHz.
    • Some of the thinnest items such as paper and hair can be measured using mm as 0.18 mm and 0.07 mm respectively.
  • History of Millimeters

The history of the millimeter can be traced from the year 1799 during the initial epiphany of the metric system came during the French Revolution. Almost within half a century, the measurement system spread across Europe. There were other unity ratios for measurement that were added to the system. Later, the unit ratios were adopted across the world. 

In addition, James Clerk Maxwell optimised a coherent system in the mid-19th century. At that period, a single base unit was used that would later derive other units. Such units were called “derived units. He came up with three basic units for length, mass and time. In the 19th century more units were included, adding more units to make the metric system more adjustable and compatible during the advancement in electromagnetism.

This later gathered an integrated system of measurement, including electromagnetic units. As a result, the millimeter started getting used in several industries as a primary unit of measurement.

Inches To Millimeters Conversion Table

Refer to the tabulated data to know more about the inches to millimeters conversion table:

Inches (“)

Millimeters (Mm)

0.01 ″

0.254000 mm

1/64 ″

0.396875 mm

1/32 ″

0.793750 mm

1/16 ″

1.587500 mm

0.1 ″

2.540000 mm

1/8 ″

3.175 mm

1/4 ″

6.35 mm

1/2 ″

12.7 mm

1 ″

25.4 mm

2 ″

50.8 mm

3 ″

76.2 mm

4 ″

101.6 mm

5 ″

127.0 mm

6 ″

152.4 mm

7 ″

177.8 mm

8 ″

203.2 mm

9 ″

228.6 mm

10 ″

254.0 mm

20 ″

508.0 mm

30 ″

762.0 mm

40 ″

1016.0 mm

50 ″

1270.0 mm

60 ″

1524.0 mm

70 ″

1778.0 mm

80 ″

2032.0 mm

90 ″

2286.0 mm

100 ″

2540.0 mm

Procedure To Convert Inches To Mm?

The value of 1 inch is equivalent to 25.4 mm. In order to convert inches to mms use the simple formula. Suppose we need to convert 30 inches to millimeters. For this conversion, you need to put the value in this formula.

Desired inches that need to be converted x value mm in inches will help you carry out the conversion.

Inches to MM Formula and Example

Refer to the information below to get an understanding of inches to MM conversion with the help of an example by applying the formula.

Here we are converting 30 inches to mm

Putting the same into the formula: 30 x 25.4 = 762

Now, creating another conversion with the same formula

Converting 21 inches to mm

With the help of the same formula: 21 x 25.4 = 533.4

Converting 50 inches to mm

By applying the formula: 50 x 25.4 = 1270

Relationship of Inches to Millimeters

The measurement unit inch belongs to the metric system of measurement, whereas the millimeters lie in the metric measurement system. The standard ratio between these two measurement units is 1 inch = 25.4 mm. 

In addition, we can create a conversion between inches and millimeters by computing the relationship between these measurement units. You need to get an understanding of the metric system, as there are numerous methodologies to create such simple conversions. As per the standards, 1 inch to mm is equivalent to 25.4 m with the help of the same value you can create a conversion.

Difference Between Inches and Millimeters

The basic difference between inches and millimeters is one belongs to the imperial units of measurement and the other to the metric measurement system respectively. Both of these measurement units are used in numerous industry standards and also establish a common ground. It also allows us to create a conversion between inches and millimeters. The standard ratio between inches and millimeters is:

1 inch equivalent to 25.4 mm (Conversion of inch to mm)

Some More Useful Articles for you :

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Mm To Inches

Know Inches To Cm

Inches To Cm

Guide To Cm To Feet Inch

Cm To Feet Inch

How To Convert Square Meter To Square Feet

Square Meter To Square Feet

Frequently Asked Question (FAQs)

How many Mm in Inches?

According to the standards of metric conversion, 1 inch is equivalent to 25.4 mm

How many Inches in Mm?

There is 0.0393701 mm in one inch. To calculate the value to need to divide the length value by 25.4.

What units are inches used to measure?

Inch is informally used for measuring electronic devices, including display screens.

What size is 5 inches in mm?

n order to convert 5 inches to mm, you need to multiply the value of inches by the vale of mm in inches. 5 x 25.4 will be equivalent to 5 inches in mm = 127.

What size is 2 inches in mm?

In order to convert 2 inches to mm, you need to multiply the value of inch with the value of mm in inches. 2 x 25.4 will be equivalent to 2 inches in mm = 50.8.

How do you convert inches to millimeters?

You need to use the simple mathematical formula Inches x 25.4 (1 mm’s value in inch) equivalent to the conversion you are looking for. For example, suppose we need to convert 6 inches to mm. By applying the simple formula 6 x 25.4 = 152.4

Shivam Singh Shivam Singh has a positive approach with keen observation skills. He is a journalist, athlete, and photographer who loves to seize the moment. He reads staggeringly to hold credibility in his writing before he initiates. Shivam is more into creative work because exploration and expression are the two things he truly desires. While not working, you can find him on a junket around the course. Writing in various genres makes him a complete package.
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