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What is a Millimeter?

Definition

A millimeter (mm) is a unit of length in the metric system, equal to one thousandth of a meter. It is often used in various fields to measure small distances and dimensions. The millimeter is a crucial unit in scientific, engineering, and everyday contexts due to its precision and ease of use. To put it into perspective, a millimeter is approximately the thickness of a credit card or the width of a paper clip.

Historical Context

The concept of the millimeter originated from the metric system, which was first introduced in France in the late 18th century during the French Revolution. The metric system was designed to be a universal and decimal-based system of measurement to replace the diverse and inconsistent systems that were previously in use.

The metric system, including the millimeter, was formally defined in 1799, and it has since been adopted worldwide with the exception of a few countries. The system's adoption was driven by its simplicity and the logical progression of units based on powers of ten, making calculations straightforward. Today, the millimeter is widely used in many countries for everyday measurements, as well as in scientific and industrial applications.

Importance and Uses

Millimeters play a vital role in various fields. In engineering and manufacturing, precise measurements are crucial for the production of high-quality products. For instance, components of machinery and electronic devices often require dimensions specified to the nearest millimeter to ensure proper functionality and assembly.

In the construction industry, accurate measurements in millimeters are essential for designing and building structures. Architectural plans and blueprints frequently use millimeters to convey detailed dimensions and specifications.

Additionally, millimeters are used in the healthcare sector, particularly in medical imaging and equipment calibration, where precise measurements can significantly impact diagnostics and treatment outcomes.

What is an Inch?

Definition

An inch (in) is a unit of length in the imperial and US customary systems of measurement. One inch is defined as exactly 25.4 millimeters, making it a convenient unit for converting between metric and imperial measurements. The inch is widely used in the United States, Canada, and the United Kingdom, particularly in industries such as construction, manufacturing, and design. For instance, common items like a standard paperclip and the diameter of a quarter coin are typically measured in inches.

Historical Context

The inch has a long and varied history, dating back to ancient civilizations. The earliest records of the inch as a unit of measurement can be traced to the Roman Empire, where it was based on the width of a man's thumb. In medieval England, the inch was defined as the length of three barleycorns placed end-to-end, a standard that was widely accepted for many centuries.

During the 14th century, King Edward II of England formalized the inch by decreeing that one inch should equal three grains of barley, dry and round, placed end-to-end lengthwise. This definition, although rudimentary, provided a basis for more standardized measurements.

The modern definition of the inch, as 25.4 millimeters, was established in the 20th century to facilitate international trade and communication. In 1959, countries such as the United States, the United Kingdom, and Canada agreed upon this definition to harmonize their measurement systems with the metric system. This agreement ensured consistency and accuracy in measurements across different countries and industries.

Importance and Uses

Inches are predominantly used in the United States and other countries that still rely on the imperial system. They are essential for various applications, including:

  • Construction and Engineering: Measurements in inches are crucial for building and infrastructure projects. Blueprints and technical drawings often use inches to specify dimensions.
  • Consumer Goods: Many household items and consumer products, such as screens, furniture, and tools, are measured in inches. For example, the diagonal measurement of television and monitor screens is commonly expressed in inches.
  • Manufacturing: In manufacturing processes, especially in the automotive and aerospace industries, precise measurements in inches ensure the compatibility and functionality of parts and components.
  • Textiles and Fashion: In the textile industry, inches are used to measure fabric, clothing dimensions, and patterns, providing a standard for sizing and fitting.

Transition to Conversion

Understanding both millimeters and inches is essential for effective unit conversion, especially in a globalized world where metric and imperial systems coexist. The next section will delve into how to convert millimeters to inches accurately, providing formulas and practical examples to facilitate easy and precise conversions.

Millimeters to Inches Conversion

To convert millimeters to inches, use the following formula:

inches = millimeters ÷ 25.4

Example: Convert 100 millimeters to inches.

100 mm ÷ 25.4 = 3.937 inches

Therefore, 100 millimeters is approximately 3.937 inches.

How to Convert mm to Inches?

Understanding Millimeters to Inches Conversion

Understanding how to convert millimeters to inches is essential for various applications, from engineering and manufacturing to everyday tasks. This section will provide you with a clear formula and example calculations to help you perform accurate conversions effortlessly.

Conversion Formula

The conversion from millimeters to inches is straightforward, thanks to the established relationship between these two units. One inch is exactly 25.4 millimeters. Therefore, to convert millimeters to inches, you can use the following formula:

Inches = Millimeters × 0.0393701

This formula uses the conversion factor of 0.0393701, which is derived from dividing 1 by 25.4. This factor allows you to accurately convert any given value in millimeters to its equivalent in inches.

Example Calculation

Let's walk through a practical example to demonstrate how to use this formula.

Example 1: Converting 50 Millimeters to Inches

To convert 50 millimeters to inches, you simply multiply the value in millimeters by the conversion factor.

50 mm × 0.0393701 = 1.9685 inches

So, 50 millimeters is equal to approximately 1.9685 inches.

Example 2: Converting 100 Millimeters to Inches

Similarly, to convert 100 millimeters to inches, you apply the same formula.

100 mm × 0.0393701 = 3.9370 inches

Therefore, 100 millimeters is equivalent to 3.9370 inches.

These calculations can be easily performed using our "mm to inches" conversion tool, which automates the process and ensures accuracy.

Practical Application of Conversion

Knowing how to convert millimeters to inches is incredibly useful in various fields:

  • Engineering and Manufacturing: Precision is crucial, and measurements often need to be converted between metric and imperial units to ensure compatibility and accuracy in production.
  • Construction: Blueprints and material specifications may use both millimeters and inches, requiring frequent conversions for clarity and accuracy.
  • Daily Life: Whether you're working on a DIY project, purchasing materials, or setting up equipment, understanding these conversions can be very handy.

Visualizing the Conversion

To better understand the size of an inch compared to a millimeter, consider the following visual comparison:

The image shows a visual comparison between millimeters and inches, illustrating how 1 inch compares to millimeters.

How to Convert Inches to mm?

Converting Inches to Millimeters

Converting inches to millimeters is a common requirement in many fields, especially when precision is key. This section will provide a clear formula for conversion and walk you through example calculations to ensure accurate and effortless conversions.

Conversion Formula

To convert inches to millimeters, you need to understand the relationship between these two units. One inch is defined as exactly 25.4 millimeters. Therefore, the formula to convert inches to millimeters is:

Millimeters = Inches × 25.4

This formula uses the conversion factor of 25.4, ensuring that your calculations are precise and reliable.

Example Calculation

Let's go through a couple of examples to illustrate how this formula works in practice.

Example 1: Converting 2 Inches to Millimeters

To convert 2 inches to millimeters, you simply multiply the number of inches by the conversion factor.

2 inches × 25.4 = 50.8 mm

Thus, 2 inches is equal to 50.8 millimeters.

Example 2: Converting 5 Inches to Millimeters

Similarly, for converting 5 inches to millimeters, you apply the same formula.

5 inches × 25.4 = 127 mm

So, 5 inches is equivalent to 127 millimeters.

These straightforward calculations can be easily performed using our "inches to millimeters" conversion tool, ensuring accuracy and efficiency.

Practical Application of Conversion

Knowing how to convert inches to millimeters is vital for many practical applications:

  • Engineering and Manufacturing: Precision in measurements is crucial for the design and fabrication of parts. Engineers often need to convert between inches and millimeters to ensure components fit correctly.
  • Construction: Construction projects frequently require conversions between imperial and metric systems. Accurate conversions are necessary for adhering to building codes and standards.
  • Healthcare: Medical professionals often convert measurements in inches to millimeters when interpreting radiographs or designing medical devices.
  • Daily Life: Whether you're measuring for a home improvement project or checking the size of a purchased item, knowing how to convert inches to millimeters is useful.

Visualizing the Conversion

To better understand the size of an inch compared to a millimeter, consider the following visual comparison:

Inches to Millimeters Comparison

The image shows a visual comparison between inches and millimeters, illustrating how 1 inch compares to millimeters.

Summary

Converting inches to millimeters is a crucial skill for various tasks, from professional engineering projects to everyday activities. By using the conversion formula and understanding its practical applications, you can ensure accurate and effective measurements in both metric and imperial systems.

mm to Inches Conversion Table

Millimeters to Inches Conversion Table

A conversion table is a handy reference that provides quick and accurate conversions from millimeters to inches. This section offers a detailed mm to inches conversion table to help you easily find the corresponding value without needing to perform calculations. Whether you are working on a construction project, engineering design, or any other task requiring precise measurements, this table will be invaluable.

Why Use a Conversion Table?

Conversion tables save time and reduce the potential for errors when converting between units. Instead of manually calculating each value, you can quickly look up the measurement you need. This is especially useful in fields like engineering, construction, manufacturing, and even daily tasks where precision is crucial.

Millimeters (mm)Inches (in)
1 mm0.0393701 in
2 mm0.0787402 in
3 mm0.118110 in
4 mm0.157480 in
5 mm0.196850 in
10 mm0.393701 in
15 mm0.590551 in
20 mm0.787402 in
25 mm0.984252 in
30 mm1.18110 in
40 mm1.57480 in
50 mm1.96850 in
60 mm2.36220 in
70 mm2.75591 in
80 mm3.14961 in
90 mm3.54331 in
100 mm3.93701 in
200 mm7.87402 in
300 mm11.811 in
400 mm15.748 in
500 mm19.685 in
600 mm23.622 in
700 mm27.5591 in
800 mm31.4961 in
900 mm35.4331 in
1000 mm39.3701 in

Using the Conversion Table

To use this conversion table, simply locate the value in millimeters in the left column and read the corresponding value in inches in the right column. This table makes it easy to find precise conversions for a wide range of measurements, ensuring accuracy in your projects.

How to Read the Table

Find the millimeter value you need to convert on the left side of the table, and read across to the right to find the equivalent measurement in inches. This straightforward approach allows you to quickly access the conversion results without manual calculations.

Example Conversions

Here are a couple of examples to illustrate how to use the table:

  • Example 1: If you need to convert 75 mm to inches, locate 75 mm in the left column. The equivalent value is approximately 2.95276 inches.
  • Example 2: To convert 150 mm to inches, find 150 mm in the table. The corresponding value is 5.90551 inches.

Practical Applications

By utilizing this conversion table, you can streamline your work and avoid the hassle of manual calculations. This tool ensures that your measurements are accurate and reliable for various tasks.

  • Engineering: Quickly convert component dimensions from millimeters to inches for design and production.
  • Construction: Use the table to check measurements for blueprints and materials.
  • Manufacturing: Ensure parts meet specifications by converting measurements for quality control.
  • Daily Tasks: Easily convert measurements for DIY projects or when shopping for items.

Summary

A millimeters to inches conversion table is a valuable tool for various professional and everyday tasks. It allows for quick and accurate conversions, helping you to streamline your work processes and achieve precise results.

How to Use Hirequotient mm to Inches Converter

Using the Hirequotient mm to Inches Converter Tool

The Hirequotient mm to inches converter is a simple and efficient way to get accurate conversions quickly. This user-friendly tool is designed to make the conversion process effortless, ensuring precision whether you are converting millimeters to inches or vice versa. Here’s a step-by-step guide to help you navigate the converter tool:

Converting Millimeters to Inches

Step 1: Enter the Value in Millimeters
Start by entering the value you wish to convert in the designated millimeters (mm) field. For instance, if you want to convert 100 millimeters to inches, type "100" in the input box.

Step 2: Hit the ‘Convert’ Button
Once you have entered the millimeter value, click the 'Convert' button. The tool will instantly calculate the equivalent value in inches using the precise conversion factor of 0.0393701. The result will be displayed in the inches field. For example, 100 mm will convert to approximately 3.93701 inches.

Example Calculation:

Input: 100 mm
Output: 3.93701 inches

Converting Inches to Millimeters

Step 1: Enter the Value in Inches
To convert inches to millimeters, enter the value in the designated inches (in) field. For example, if you want to convert 4 inches to millimeters, type "4" in the input box.

Step 2: Hit the ‘Convert’ Button
Click the 'Convert' button after entering the inch value. The tool will use the conversion factor of 25.4 to calculate the equivalent value in millimeters. The result will be displayed in the millimeters field. For instance, 4 inches will convert to exactly 101.6 millimeters.

Example Calculation:

Input: 4 inches
Output: 101.6 mm

Benefits of Using Hirequotient Converter Tool

Using the Hirequotient mm to inches converter offers several advantages:

  • Efficiency: The tool provides instant results, making it ideal for quick conversions.
  • Accuracy: It uses precise conversion factors, ensuring accurate and reliable results.
  • Ease of Use: The simple interface makes it accessible for users of all skill levels.
  • Versatility: The tool supports both mm to inches and inches to mm conversions, catering to various needs.

Practical Applications

By understanding how to use this converter tool, you can seamlessly perform unit conversions, enhancing your productivity and accuracy in projects. Whether you are working in engineering, construction, or any field requiring precise measurements, this tool is an invaluable resource.

What are the Advantages of Using Our Unit Converter?

Why Choose the Hirequotient mm to Inches Converter?

Choosing the right tool for unit conversion can significantly impact your workflow and accuracy. The Hirequotient mm to inches converter offers numerous advantages, making it the ideal choice for all your conversion needs. This section highlights why our unit converter stands out in terms of efficiency, accuracy, and ease of use.

Efficiency

One of the primary advantages of using our unit converter is its efficiency. The tool is designed to provide instant results, saving you valuable time. Whether you are converting millimeters to inches or vice versa, you can expect immediate and precise outputs without any delay. This efficiency is crucial for professionals in fields like engineering, manufacturing, and construction, where time-sensitive projects demand quick and reliable conversions.

Example: If you're working on an engineering project and need to convert multiple measurements rapidly, our converter ensures you can do so without interrupting your workflow. This tool can handle a high volume of conversions seamlessly, making it an indispensable asset in fast-paced environments.

Accuracy

Accuracy is another critical benefit of our unit converter. The tool uses precise conversion factors—0.0393701 for converting millimeters to inches and 25.4 for converting inches to millimeters—ensuring that all results are exact and reliable. This level of accuracy is essential for tasks that require precise measurements, such as component manufacturing and architectural design.

Example: Inaccurate conversions can lead to significant errors, which can be costly and time-consuming to rectify. By using our highly accurate converter, you can minimize the risk of errors, ensuring your measurements are correct and dependable every time.

Easy to Use

Our unit converter is incredibly user-friendly, designed with a straightforward interface that makes it accessible for users of all skill levels. Whether you are a seasoned professional or a novice, you can use the tool with ease. Simply enter the value you wish to convert, select the appropriate unit (mm or inches), and click the 'Convert' button. The tool does the rest, providing you with accurate results instantly.

Example: The intuitive design eliminates the need for complex calculations, reducing the potential for mistakes and making the conversion process hassle-free. This ease of use ensures that anyone can perform conversions efficiently, enhancing productivity across various tasks.

Practical Applications

The practical applications of our unit converter extend across numerous fields:

  • Engineering and Manufacturing: Ensuring precise measurements for designing and fabricating components.
  • Construction: Converting measurements in blueprints and material specifications accurately.
  • Healthcare: Interpreting radiographic measurements and calibrating medical equipment.
  • Everyday Use: Measuring items for DIY projects, purchasing materials, and setting up equipment.

Summary

The Hirequotient mm to inches converter offers unparalleled efficiency, accuracy, and ease of use. These advantages make it the perfect tool for anyone needing reliable unit conversions. By incorporating this tool into your workflow, you can enhance your productivity, reduce errors, and achieve precise results effortlessly.

Practical Applications

Understanding the Practical Applications of Converting Millimeters to Inches

Understanding the practical applications of converting millimeters to inches is essential for various industries. Accurate unit conversions ensure precision, efficiency, and reliability across numerous fields. This section explores the critical roles of millimeter to inch conversions in engineering and manufacturing, construction, consumer products, healthcare, science and research, and the automotive industry.

Engineering and Manufacturing

In engineering and manufacturing, precision is paramount. Components must fit together perfectly to ensure the proper functioning of machines and products. Millimeter to inch conversions are crucial when working with designs and specifications that may use both metric and imperial units. For example, in the production of electronic devices, accurate conversions ensure that parts fit seamlessly, avoiding costly errors and delays. According to a study by the National Institute of Standards and Technology, even minor inaccuracies in measurements can lead to significant issues in product assembly and performance.

Construction

The construction industry relies heavily on accurate measurements for everything from building plans to material specifications. Converting millimeters to inches is often necessary when working with international suppliers or different construction standards. For instance, architectural blueprints may use millimeters, while on-site measurements are taken in inches. Ensuring accurate conversions helps maintain consistency and precision, preventing structural issues and ensuring the safety and integrity of buildings.

Consumer Products

Consumer products, from home appliances to clothing, often require precise measurements for manufacturing and fitting. Accurate conversions between millimeters and inches are essential to ensure products meet design specifications and customer expectations. For example, a furniture designer may need to convert millimeter measurements to inches when designing products for different markets. Accurate conversions ensure that the final products are of high quality and fit for their intended use.

Healthcare

In healthcare, precise measurements are critical for diagnostics, treatment, and equipment calibration. Medical professionals often need to convert measurements in millimeters to inches for various applications, such as interpreting radiographic images or designing medical devices. For example, the dimensions of a prosthetic limb must be accurately converted to ensure proper fit and functionality. Inaccurate conversions can lead to significant health risks, underscoring the importance of precision in this field.

Science and Research

In scientific research, accurate measurements are crucial for experiments and data analysis. Researchers frequently convert millimeters to inches when working with equipment or interpreting data from international sources. For example, a biologist might convert the size of microorganisms measured in millimeters to inches for a publication intended for a global audience. Accurate conversions ensure that scientific findings are reliable and universally understood.

Automotive Industry

The automotive industry relies on precise measurements for the design and manufacturing of vehicles. Converting millimeters to inches is often necessary when working with parts and specifications that use different measurement systems. For example, a car manufacturer might need to convert the dimensions of engine components from millimeters to inches to ensure compatibility with suppliers' parts. Accurate conversions are essential to maintain the quality and performance of vehicles, preventing potential safety issues.

Summary

Converting millimeters to inches is a fundamental skill that has wide-ranging applications across various industries. Whether you are working in engineering, construction, consumer products, healthcare, science, or the automotive industry, accurate conversions ensure precision, efficiency, and reliability. By using our mm to inches conversion tool, you can achieve these conversions effortlessly, enhancing your productivity and ensuring the accuracy of your measurements.

FAQs

How to Convert mm to Inches

To convert millimeters to inches, multiply the number of millimeters by 0.0393701. For example, to convert 10 mm to inches, you multiply 10 by 0.0393701, which equals approximately 0.393701 inches.

How to Convert Inches to mm

To convert inches to millimeters, multiply the number of inches by 25.4. For instance, if you want to convert 2 inches to mm, you multiply 2 by 25.4, which equals 50.8 mm.

What is mm to Inches?

Millimeters (mm) to inches (in) conversion is a process of converting the metric unit of length (mm) to the imperial unit (in). One millimeter is equal to 0.0393701 inches.

How to Change Units in AutoCAD from Inches to mm

In AutoCAD, to change units from inches to millimeters, type “UNITS” in the command line, select millimeters under the insertion scale, and press OK.

What is 10 mm to Inches?

10 millimeters is equal to approximately 0.393701 inches.

How Many mm to Inches?

To find out how many millimeters make up an inch, you divide 1 by 0.0393701, which is approximately 25.4 mm per inch.

How to Measure mm in Inches

To measure millimeters in inches, use a conversion factor of 0.0393701. Measure the length in millimeters and multiply by this factor to get the length in inches.

How to Change mm to Inches in Fusion 360

In Fusion 360, to change units from millimeters to inches, go to Document Settings, click on the units dropdown, and select inches.

What is the Conversion from mm to Inches?

The conversion factor from millimeters to inches is 0.0393701. Multiply the number of millimeters by this factor to get the equivalent measurement in inches.

How many inches is 10 mm?

10 mm = 0.393701 inches.

How many mm are there in an inch?

1 inch = 25.4 mm.

What is 5 mm in inches?

5 mm = 0.19685 inches.

How do you convert 50 mm to inches?

50 mm × 0.0393701 = 1.9685 inches.

What is 100 mm in inches?

100 mm = 3.93701 inches.

How many inches is 1 mm?

1 mm = 0.0393701 inches.

Is 25.4 mm equal to 1 inch?

Yes, 25.4 mm is exactly 1 inch.

What is the easiest way to convert mm to inches?

Multiply mm by 0.0393701.

How many inches is 200 mm?

200 mm = 7.87402 inches.

How do you convert 1 inch to mm?

Multiply inches by 25.4.

How many mm is 0.5 inch?

0.5 inch = 12.7 mm.

What is 250 mm in inches?

250 mm = 9.84252 inches.

How many mm is 2 inches?

2 inches = 50.8 mm.

What is 300 mm in inches?

300 mm = 11.811 inches.

How many inches is 30 mm?

30 mm = 1.1811 inches.

What is 400 mm in inches?

400 mm = 15.748 inches.

How many mm is 3 inches?

3 inches = 76.2 mm.

What is 500 mm in inches?

500 mm = 19.685 inches.

How many inches is 40 mm?

40 mm = 1.5748 inches.

What is 600 mm in inches?

600 mm = 23.622 inches.

How many mm is 4 inches?

4 inches = 101.6 mm.

What is 700 mm in inches?

700 mm = 27.5591 inches.

How many inches is 50 mm?

50 mm = 1.9685 inches.

What is 800 mm in inches?

800 mm = 31.4961 inches.

How many mm is 5 inches?

5 inches = 127 mm.

What is 900 mm in inches?

900 mm = 35.4331 inches.

How many inches is 60 mm?

60 mm = 2.3622 inches.

What is 1000 mm in inches?

1000 mm = 39.3701 inches.

How many mm is 6 inches?

6 inches = 152.4 mm.

What is 25 mm in inches?

25 mm = 0.984252 inches.

How many inches is 70 mm?

70 mm = 2.75591 inches.

What is 150 mm in inches?

150 mm = 5.90551 inches.

How many mm is 7 inches?

7 inches = 177.8 mm.

What is 20 mm in inches?

20 mm = 0.787402 inches.

How many inches is 80 mm?

80 mm = 3.14961 inches.

What is 75 mm in inches?

75 mm = 2.95276 inches.

How many mm is 8 inches?

8 inches = 203.2 mm.

What is 35 mm in inches?

35 mm = 1.37795 inches.

How many inches is 90 mm?

90 mm = 3.54331 inches.

What is 45 mm in inches?

45 mm = 1.77165 inches.

How many mm is 9 inches?

9 inches = 228.6 mm.

What is 3000 mm in inches?

3000 mm = 118.11 inches.

How many inches is 120 mm?

120 mm = 4.72441 inches.

What is 15 mm in inches?

15 mm = 0.590551 inches.

How many mm is 10 inches?

10 inches = 254 mm.

What is 180 mm in inches?

180 mm = 7.08661 inches.

How many inches is 110 mm?

110 mm = 4.33071 inches.

What is 40 mm in inches?

40 mm = 1.5748 inches.

How many mm is 11 inches?

11 inches = 279.4 mm.

What is 240 mm in inches?

240 mm = 9.44882 inches.

How many inches is 130 mm?

130 mm = 5.11811 inches.

What is 60 mm in inches?

60 mm = 2.3622 inches.

How many mm is 12 inches?

12 inches = 304.8 mm.

What is 220 mm in inches?

220 mm = 8.66142 inches.

How many inches is 140 mm?

140 mm = 5.51181 inches.

What is 55 mm in inches?

55 mm = 2.16535 inches.

How many mm is 13 inches?

13 inches = 330.2 mm.

What is 260 mm in inches?

260 mm = 10.2362 inches.

How many inches is 150 mm?

150 mm = 5.90551 inches.

What is 85 mm in inches?

85 mm = 3.34646 inches.

How many mm is 14 inches?

14 inches = 355.6 mm.

What is 280 mm in inches?

280 mm = 11.0236 inches.

How many inches is 160 mm?

160 mm = 6.29921 inches.

What is 95 mm in inches?

95 mm = 3.74016 inches.

How many mm is 15 inches?

15 inches = 381 mm.

What is 320 mm in inches?

320 mm = 12.5984 inches.

How many inches is 170 mm?

170 mm = 6.69291 inches.

What is 105 mm in inches?

105 mm = 4.13386 inches.

How many mm is 16 inches?

16 inches = 406.4 mm.

What is 340 mm in inches?

340 mm = 13.3858 inches.

How many inches is 180 mm?

180 mm = 7.08661 inches.

What is 115 mm in inches?

115 mm = 4.52756 inches.

How many mm is 17 inches?

17 inches = 431.8 mm.

What is 360 mm in inches?

360 mm = 14.1732 inches.

How many inches is 190 mm?

190 mm = 7.48031 inches.

What is 125 mm in inches?

125 mm = 4.92126 inches.

How many mm is 18 inches?

18 inches = 457.2 mm.