Millimeter Converter
Unit ConversionConvert millimeters to centimeters, meters, kilometers, inches, feet, yards, and miles. Type any value into any field and every other unit updates instantly.
Millimeter
Metric
Imperial / US
1 Millimeter = 1,000 Micrometers ⟷ 1 Micrometer = 0.001 Millimeters
1 Millimeter = 0.1 Centimeters ⟷ 1 Centimeter = 10 Millimeters
1 Millimeter = 0.001 Meters ⟷ 1 Meter = 1,000 Millimeters
1 Millimeter = 0.000001 Kilometers ⟷ 1 Kilometer = 1,000,000 Millimeters
1 Millimeter = 0.0393701 Inches ⟷ 1 Inch = 25.4 Millimeters
1 Millimeter = 0.00328084 Feet ⟷ 1 Foot = 304.8 Millimeters
1 Millimeter = 0.00109361 Yards ⟷ 1 Yard = 914.4 Millimeters
1 Millimeter = 0.000000621371 Miles ⟷ 1 Mile = 1,609,344 Millimeters
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Unit Conversion calculators
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SponsoredThis mm converter shows a length in millimeters next to every other common unit. Type millimeters, or any other unit, and the micrometers, centimeters, meters, kilometers, inches, feet, yards and miles boxes update as you type.
A millimeter (mm) is one thousandth of a meter. It is the working unit for engineering drawings, tools, screws, jewelry, rainfall and anything small enough that centimeters are too coarse. The inch is defined as exactly 25.4 mm, so converting between the two never needs rounding.
The micrometer box covers lengths a thousand times smaller still, used for filters, coatings and fine tolerances. Lengths cannot be negative, so a negative entry clears the other boxes.
How Many Millimeters in an Inch
There are exactly 25.4 millimeters in an inch. The value was fixed on July 1, 1959, when the United States and other English-speaking nations agreed on a common inch, as NIST explains. To convert, multiply inches by 25.4, or divide millimeters by 25.4.
Why the Exact 25.4 Factor Matters
Some converters multiply by a rounded 0.03937 instead of dividing by 25.4. The difference looks tiny, but 152.4 mm then comes out as 5.999988 inches instead of exactly 6. Over many parts or long runs the error adds up, so this converter always uses the exact definition.
Inch to MM Chart for Fractions
Fractional inches from 1/16 to 1 inch, as decimals and in millimeters. Every value is exact.
| Fraction | Decimal Inches | Millimeters |
|---|---|---|
| 1/16 in | 0.0625 in | 1.5875 mm |
| 1/8 in | 0.125 in | 3.175 mm |
| 3/16 in | 0.1875 in | 4.7625 mm |
| 1/4 in | 0.25 in | 6.35 mm |
| 5/16 in | 0.3125 in | 7.9375 mm |
| 3/8 in | 0.375 in | 9.525 mm |
| 7/16 in | 0.4375 in | 11.1125 mm |
| 1/2 in | 0.5 in | 12.7 mm |
| 9/16 in | 0.5625 in | 14.2875 mm |
| 5/8 in | 0.625 in | 15.875 mm |
| 11/16 in | 0.6875 in | 17.4625 mm |
| 3/4 in | 0.75 in | 19.05 mm |
| 13/16 in | 0.8125 in | 20.6375 mm |
| 7/8 in | 0.875 in | 22.225 mm |
| 15/16 in | 0.9375 in | 23.8125 mm |
| 1 in | 1 in | 25.4 mm |
To turn a decimal inch reading back into the nearest fraction, the Decimal Inches to Fraction Converter rounds to 1/16 or finer. Tire widths are given in millimeters, and the Tire Size Calculator works with them directly, while thin coatings and sheet stock are often specified in mils, covered by the Mils to Millimeters Converter.
Micrometers and Millimeters
A micrometer (µm), often called a micron, is exactly 0.001 millimeter, according to NIST Handbook 44. So 1 mm is 1,000 µm, and converting µm to mm means dividing by 1,000. The unit appears in filter ratings, paint and coating thickness and machining tolerances.
Millimeters to Other Units
Single conversions from millimeters to one other unit, one page per pair.
- Millimeters to Feet Converter: 1 foot equals exactly 304.8 millimeters
- Millimeters to Inches Converter: 1 inch equals exactly 25.4 millimeters
- Millimeters to Kilometers Converter: 1 kilometer equals 1,000,000 millimeters
- Millimeters to Meters Converter: 1 meter equals 1,000 millimeters
- Centimeters to Millimeters Converter: 1 centimeter equals 10 millimeters
Other Length Converters
Each converter below shows one length in every common unit at once, starting from a different unit.
- Kilometer Converter: kilometers to miles, meters and nautical miles
- Centimeter Converter: centimeters to inches, feet and millimeters
- Mile Converter: miles to kilometers, feet, yards and nautical miles
- Feet Converter: feet to inches, meters and centimeters
- Inch Converter: inches to centimeters and millimeters, with an inch fraction chart
- Meter Converter: meters to feet, inches and centimeters, with metric prefixes
- Yard Converter: yards to feet, meters and miles
- Distance Converter: travel and race distances in miles and kilometers
- Height Converter: heights in feet and inches, centimeters and meters
- Length Converter: pick any common length unit and convert it
Frequently Asked Questions
How many centimeters is 1 mm?
1 millimeter is 0.1 centimeter. There are 10 mm in a centimeter, so divide millimeters by 10 to get centimeters.
How many mm are in a meter?
There are exactly 1,000 millimeters in a meter, since milli means one thousandth.
Is a micron the same as a micrometer?
Yes. Micron is the common name for the micrometer, symbol µm, equal to one thousandth of a millimeter.
How do I write millimeters?
The symbol is mm, in lowercase with no period and no s for plurals: 5 mm, not 5 mms.
Can I type into a box other than millimeters?
Yes. Every box is an input. Type inches, micrometers or meters and every other box, including millimeters, updates.
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