How to Convert Mm to Inches Using Fractions
Inches and millimeters measure distance. In the metric system, the meter is the standard unit and the prefix "milli-" represents 1/1000th. Each inch equals exactly 25.4 millimeters. Using conversion factors expressed as fractions, you can easily convert between millimeters and inches. You many need to convert if you have a ruler that only has metric units, but you need to measure a distance in inches.
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Instructions
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Measure the distance you want to convert from millimeters to inches using a ruler.
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Multiply the distance in millimeters by 5/127 to convert to inches. For example, if you had 50 millimeters, you would multiply 50 by 5/127 to get 1.9685 inches.
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Divide the distance in millimeters by 127/5 to check your answer. Finishing the example, you would divide 50 by 127/5 to get 1.9685.
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References
- Photo Credit the ruler image by timur1970 from Fotolia.com
