Meters to Nanometers
Type a value in either box to convert between meters and nanometers. The factor is 1e+09.
| Meters | Nanometers |
|---|---|
| 1 m | 1000000000 nm |
| 2 m | 2000000000 nm |
| 3 m | 3000000000 nm |
| 5 m | 4999999999.999999 nm |
| 10 m | 9999999999.999998 nm |
| 25 m | 24999999999.999996 nm |
| 50 m | 49999999999.999992 nm |
| 100 m | 99999999999.999985 nm |
How to use
- Enter a value in the Meters field.
- The Nanometers figure appears immediately — no button to press.
- Typing in the Nanometers field converts back to Meters the same way.
- Use the reference table for the values that come up most often.
Meters to Nanometers formula
Converting meters to nanometers is a single multiplication by 1e+09.
nm = m × 1e+09
Why this factor: the meter and the nanometer are both defined against the meter, so dividing one definition by the other gives 1e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 1e+09 — or use the Nanometers to Meters converter, which is the same calculation reversed.
Worked example
Take 12 m and multiply by the factor 1e+09: the result is 11999999999.999998 nm.
12 m × 1e+09 = 11999999999.999998 nm
The converter above does this for any value you type, in either direction.
What is a meter?
The meter is the SI base unit of length — the reference every other length unit is now defined against.
Definition: Since 1983 the meter has been defined by fixing the speed of light in vacuum at exactly 299,792,458 meters per second, so a meter is the distance light travels in 1/299,792,458 of a second.
Where it is used: Universal in science, engineering and everyday measurement everywhere except the United States.
What is a nanometer?
A nanometer is one billionth of a meter — the scale of molecules and visible light wavelengths.
Definition: Exactly 1×10⁻⁹ meter by SI prefix definition.
Where it is used: Semiconductor process nodes, optical coatings, and wavelengths (visible light is roughly 380–750 nm).
Meters vs Nanometers
The meter is an SI unit while the nanometer is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many nanometers are in a meter?
One meter equals 1e+09 nanometers.
What is the formula to convert meters to nanometers?
Multiply the number of meters by 1e+09. To reverse it, divide by 1e+09 instead.
How do I convert nanometers back to meters?
Divide by 1e+09, which is the same as multiplying by 1e-09.
How many nanometers are in 10 meters?
10 m works out to 9999999999.999998 nm.
How is the meter defined?
Since 1983 the meter has been defined by fixing the speed of light in vacuum at exactly 299,792,458 meters per second, so a meter is the distance light travels in 1/299,792,458 of a second.