Millimeter is 0.001 meter units.
Millimeters to Nanometers Converter — mm to nm
Convert Millimeter (mm) to Nanometer (nm) using the exact conversion factor (1 millimeter = 1,000,000 nanometer). See the formula, worked examples, conversion table, history, and common uses.
Millimeters to Nanometers converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Nanometer is 1e-9 meter units.
Result = input x 0.001 / 1e-9.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millimeters to Nanometers
Millimeter and Nanometer both measure length. Millimeter is most often used for engineering drawings and manufacturing tolerances worldwide (including in the us).
Formula
nanometers = millimeters × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 millimeter equals 0.001 base units, and 1 nanometer equals 1e-9 base units, so dividing one by the other gives the direct millimeter-to-nanometer factor of 1000000.
Simple example
1 mm × 1000000 = 1,000,000 nm
1 millimeter = 1,000,000 nanometers.
Real-world example
10 mm × 1000000 = 10,000,000 nm
10 millimeters = 10,000,000 nanometers.
Conversion table
| Millimeter (mm) | Nanometer (nm) |
|---|---|
| 1 mm | 1,000,000 nm |
| 5 mm | 5,000,000 nm |
| 10 mm | 10,000,000 nm |
| 21.0975 mm | 21,097,500 nm |
| 42.195 mm | 42,195,000 nm |
| 100 mm | 100,000,000 nm |
Reverse conversion: Nanometer to Millimeter
1 nm × 0.000001 = 0.000001 mm
1 nanometer = 0.000001 millimeters.
millimeters = nanometers × 0.000001
For a page dedicated to this direction, see Nanometer to Millimeter.
Understanding the Millimeter
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small/precision length unit worldwide, including in US engineering and manufacturing
Uses of the Millimeter today
- Engineering drawings and manufacturing tolerances worldwide (including in the US)
- Rainfall measurement in most countries
- Small-scale everyday measurement (screen sizes, hardware)
History of the Millimeter
The millimeter follows from the meter via the 'milli-' SI prefix (10⁻³). It is notable as one of the few metric units in routine US technical/engineering use, since precision manufacturing and electronics are often specified in millimeters even in the US.
Historical origin. Millimeter was not the invention of a single named person; it developed through the process described above.
Understanding the Nanometer (nm)
Nanometer is 1e-9 meter units.
Millimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'milli-' as the prefix for 10⁻³.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanometers are in 1 millimeter?
1 millimeter equals 1,000,000 nanometers, using the exact defined conversion factor rather than an estimate.
How do I convert millimeter to nanometer?
Multiply the millimeter value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert nanometer back to millimeter?
Use the reverse factor: 1 nanometer equals 0.000001 millimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a millimeter?
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
What is a nanometer?
Nanometer (nm) is a unit of length.
Is the millimeter to nanometer conversion exact?
Yes. Both millimeter and nanometer are defined by fixed standards rather than physical artifacts, so the factor of 1000000 used above is exact to as many digits as you choose to display.
Where is the millimeter still used today?
Standard small/precision length unit worldwide, including in US engineering and manufacturing