Content

• Steps
• Part 1 of 4: Basic Equality
• Part 2 of 4: Quick Solutions
• Part 3 of 4: Related Tasks
• Part 4 of 4: Examples
• What do you need

Converting inches to millimeters is a fairly straightforward math problem. It is performed as follows.

Steps

Part 1 of 4: Basic Equality

1. 1 The ratio of an inch to a millimeter. In the international system of units, one inch is equal to 25.4 millimeters.
   • Written in the form of equality, this ratio looks as follows: 1inch = 25.4mm
   • This officially standardized measurement was introduced into the international system of units in 1959.
   • Both inch and millimeter are units of length. Inches belongs to the English system of units, and millimeters to the metric system.
   • Although inches are used in the US, UK, and Canada, you will often need to convert this unit to metric (such as millimeters) for scientific purposes.
   • The inverse ratio looks like this: 1 millimeter is equal to 0.0393700787402 inches.
2. 2 Record the measurement in inches. To convert a measurement in inches to millimeters, you first need to record the original measurement.
   • We will then convert this measurement to millimeters using the inch to millimeter ratio.
   • Example: 7 inches
3. 3 Multiply this value by 25.4. You need to multiply the original value in inches by the ratio of a millimeter to one inch: 25.4 mm / 1 inch.
   • The value of the inch must be put in the denominator so that it is mutually exclusive with the value of the inch in the original measurement. When inches are mutually exclusive, millimeters become the only measurement.
   • Example: 7 inches * (25.4 mm / 1 inch) = 177.8 mm * (inch / inch) = 177.8 mm
4. 4 Write down the result. If everything is done correctly, the result will be in millimeters.
   • Example: 177.8 mm

Part 2 of 4: Quick Solutions

1. 1 Use a ruler. The middle ruler is 12 inches long, or 1 foot. Many rulers have length marks in inches on one side and in centimeters and millimeters on the other. If your original measurement is 12 inches or less, you can use a ruler to measure the same distance in millimeters.
   • Note that millimeters are marked on the ruler with small stripes between large centimeter marks. There are 10 millimeters in one centimeter.
2. 2 Use a website that automatically converts units. If you urgently need to determine the value equal to the original value in inches, you can use the online service that automatically converts the units of measurement.
   • Go to the site and find the field for entering measurements to convert.
   • Enter the numbers in the appropriate fields and select the units of measure between which you are going to find the ratio.
   • Click on the button "Calculate", "Convert", "Convert" or another appropriate button to view the result.
   • Sites that allow you to calculate the ratio of units of measure:
     • allcalc.ru
     • convert-me.com
     • You can also enter the text of the task (for example, 7 inches = mm) directly into the search field of any major search engine (eg Google and Yandex). The search engine will be able to convert the units and the answer will be displayed on the results page.
3. 3 Graph of common conversions. For small measurements, you can use a conversion graph, for example, the table below. Determine the value in inches and find the corresponding value in millimeters in the graph.
   • 1/64 in = 0.3969 mm
   • 1/32 in = 0.7938 mm
   • 1/16 in = 1.5875 mm
   • 1/8 in = 3.1750 mm
   • 1/4 in = 6.3500 mm
   • 1/2 in = 12.7000 mm
   • 3/4 in = 19.0500 mm
   • 7/8 inches = 22.2250 mm
   • 15/16 inches = 23.8125 mm
   • 31/32 inches = 24.6062 mm
   • 63/64 in = 25.0031 mm
   • 1 inch = 25.4001 mm
   • 1 1/8 in = 28.5750 mm
   • 1 1/4 in = 31.7500 mm
   • 1 3/8 in = 34.9250 mm
   • 1 1/2 in = 38.1000 mm
   • 1 5/8 in = 41.2750 mm
   • 1 3/4 in = 44.4500 mm
   • 2 in = 50.8000 mm
   • 2 1/4 in = 57.1500 mm
   • 2 1/2 in = 63.5000 mm
   • 2 3/4 in = 69.8500 mm
   • 3 in = 76.2000 mm
   • 3 1/4 in = 82.5500 mm
   • 3 1/2 in = 88.9000 mm
   • 3 3/4 in = 95.2500 mm
   • 4 in = 101.6000 mm
   • 4 1/2 in = 114.3000 mm
   • 5 inches = 127 mm
   • 5 1/2 in = 139.7000 mm
   • 6 inches = 152.4000 mm
   • 8 inches = 203.2000 mm
   • 10 inches = 254 mm

Part 3 of 4: Related Tasks

1. 1 Convert inches to centimeters. One inch is 2.54 centimeters. To convert inches to centimeters, multiply the original value in inches by 2.54.
   • Example: 7 inches * (2.54 cm / 1 inch) = 17.78 cm
   • Please note that the value in centimeters will be 10 times less than the value in millimeters. With a value in millimeters, you can calculate its equivalent in centimeters by dividing by 10.
2. 2 Convert inches to meters. One inch is 0.0254 meters. To convert inches to meters, multiply the original value in inches by 0.0254.
   • Example: 7 inches * (0.0254 m / 1 in) = 0.1778 m
   • Please note that the value in meters will be 1000 times less than the value in millimeters. Given the value in millimeters, you can calculate its equivalent in meters by dividing by 1000.
3. 3 Transformation millimeters to inches. Given the original value in millimeters, you can calculate the equivalent in inches by multiplying the value in millimeters by 0.0393700787 inches or dividing it by 25.4 millimeters.
   • Example: 177.8 mm * (0.0393700787 in / 1 mm) = 7 in
   • Example: 177.8 mm * (1 inch / 25.4 mm) = 7 inches

Part 4 of 4: Examples

1. 1 Answer the question: how many millimeters are in 4.78 inches? To find the answer, multiply 4.78 inches by 25.4 millimeters.
   • 4.78 in. * (25.4 mm / 1 in.) = 121.412 mm
2. 2 Convert 117 inches to millimeters. To do this, multiply 117 inches by 25.4 millimeters.
   • 177 inches * (25.4 mm / 1 inch) = 4495.8 mm
3. 3 Determine how many millimeters are in 93.6 inches. The answer can be obtained by multiplying 93.6 inches by 25.4 millimeters.
   • 93.6 in. * (25.4 mm / 1 in.) = 2377.44 mm
4. 4 Determine how to convert 15.101 inches to millimeters. The answer can be obtained by multiplying 15.101 inches by 25.4 millimeters.
   • 15.101 in. * (25.4 mm / 1 in.) = 383.5654 mm

What do you need

• Calculator
• Pencil
• Paper
• Ruler or other measuring tool