Convert Millimeters to Inches
Enter your millimeter value in the form below to get the value calculated in inches.
How to Convert Millimeters to Inches
Convert millimeters to inches with this simple formula:
Converting a millimeter length measurement to an inch measurement involves multiplying the length by the conversion ratio to find the result. One millimeter is equal to 0.03937 inches, so to convert simply multiply by 0.03937.
Our inch fraction calculator can add millimeters and inches together and it also automatically converts the results to US customary, imperial and SI metric values.
Millimeters and inches are both units used to measure length. Learn more about length and find more length measurement conversion calculators. Millimeters are a metric measurement and can be abbreviated as mm, for example 1 mm. Inches are an imperial measurement and can be abbreviated as in, for example 1 in. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.
Millimeter is spelled millimetre internationally, and it is equal in length to .1 centimeters, 1000 micrometers, or 5/127 inch. They are represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a dime is 1.35mm.
The actual length of an inch has varied because of variances of the length of a foot. Throughout history it has been equal to 1/12 - 1/16 of a foot, but there are now exactly 12 inches in a foot. In 1959 the world agreed to the exact length of the national yard, .9144 meters. As such a foot is equal to .3048 meters and an inch is equal to 2.54 centimeters.
The standard ruler has 12", and metric combinations have 30 cm. Inches are also often measured using tape measures which commonly come in lengths from 6' - 35'. Other types of measuring devices include scales, calipers, measuring wheels, micrometers, yardsticks, and even lasers.
We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs. If you need a ruler you can also download and print our free printable rulers which include both imperial and metric measurements.
Millimeter Measurements and Equivalent Inch Conversions
More Millimeter Length Conversions
- Convert to Miles
- 1 mm is equal to 6.2137E-7 miles
- Convert to Yards
- 1 mm is equal to 0.001094 yards
- Convert to Feet
- 1 mm is equal to 0.003281 feet
- Convert to Kilometers
- 1 mm is equal to 1.0E-6 kilometers
- Convert to Meters
- 1 mm is equal to 0.001 meters
- Convert to Centimeters
- 1 mm is equal to 0.1 centimeters
- Convert to Micrometers
- 1 mm is equal to 1,000 micrometers
- Convert to Nanometers
- 1 mm is equal to 1,000,000 nanometers