How to Convert Millimetres to Nanometres (mm to nm)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert millimetres into nanometres by hand, with examples and a quick-reference table.
The conversion
To convert millimetres to nanometres, multiply the value by 1,000,000. To go the other way, divide by the same number (or multiply by 1.000000e-06). For a quick estimate, multiply by about 1,000,000.
Nanometres = millimetres × 1,000,000
Worked examples
- 3 mm = 3,000,000 nm
- 12.5 mm = 12,500,000 nm
- 75 mm = 75,000,000 nm
Millimetres to Nanometres table
| Millimetres | Nanometres |
|---|---|
| 1 mm | 1,000,000 nm |
| 2 mm | 2,000,000 nm |
| 5 mm | 5,000,000 nm |
| 10 mm | 10,000,000 nm |
| 20 mm | 20,000,000 nm |
| 25 mm | 25,000,000 nm |
| 50 mm | 50,000,000 nm |
| 100 mm | 100,000,000 nm |
| 250 mm | 250,000,000 nm |
| 500 mm | 500,000,000 nm |
| 1,000 mm | 1,000,000,000 nm |
Common questions
Is mm to nm exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Nanometres to Millimetres converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Millimetres to Nanometres Converter or browse all length converters.
Run your own numbers: Millimetres to Nanometres Converter