Millimeter (mm)
One thousandth of a meter.
What is a millimeter?
- Symbol
- mm
- Quantity
- Length
- Unit system
- SI
- Definition
- One thousandth of a meter.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
The standard unit on engineering drawings in most of the world, and common for rainfall, sheet thickness and small parts.
Millimeter in other length units
- 1 mm = 1000000 nmNanometer
- 1 mm = 1000 µmMicrometer
- 1 mm = 0.1 cmCentimeter
- 1 mm = 0.001 mMeter
- 1 mm = 0.000001 kmKilometer
- 1 mm = 10000000 ÅÅngström
- 1 mm ≈ 39.37007874 milMillimeter to Mil (thou) converter
- 1 mm ≈ 0.03937007874 inMillimeter to Inch converter
- 1 mm ≈ 0.003280839895 ftFoot
- 1 mm ≈ 0.001093613298 ydYard
- 1 mm ≈ 6.213711922e-7 miMile
- 1 mm ≈ 5.399568035e-7 nmiNautical mile
Millimeter quick reference
| Millimeter | Mil (thou) | Inch | Meter |
|---|---|---|---|
| 1 mm | ≈ 39.37007874 mil | ≈ 0.03937007874 in | = 0.001 m |
| 10 mm | ≈ 393.7007874 mil | ≈ 0.3937007874 in | = 0.01 m |
| 100 mm | ≈ 3937.007874 mil | ≈ 3.937007874 in | = 0.1 m |
| 1000 mm | ≈ 39370.07874 mil | ≈ 39.37007874 in | = 1 m |
Where the millimeter fits
The next smaller length unit is the mil (mil). 1 mm ≈ 39.37007874 mil, and 1 mil = 0.0254 mm.
The next larger length unit is the centimeter (cm). 1 mm = 0.1 cm, and 1 cm = 10 mm.
Frequently asked questions
- How many mils are in one millimeter?
- One millimeter ≈ 39.37007874 mil (mils).
- How many inches are in one millimeter?
- One millimeter ≈ 0.03937007874 in (inches).
- How many meters are in one millimeter?
- One millimeter = 0.001 m (meters).