Convert Exameter to Nanometer
Convert exameters to nanometers instantly. 1 exameter = 1e+27 nanometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Nanometer to Exameter converter for the reverse conversion.
Units explained
Exameter
An exameter is a metric unit of length equal to one quintillion meters (1×10¹⁸ m). It is among the largest defined SI prefix units of length and appears almost exclusively in astrophysical contexts.
The exameter uses the SI prefix exa- (from Greek hex, six, related to the exponent's powers-of-thousand grouping), adopted by the CGPM in 1975 to denote 10¹⁸.
Exameters could be used to express galactic-scale distances. One kiloparsec is approximately 30.9 Em. Astronomy generally uses parsecs, kiloparsecs, and megaparsecs instead.
SI prefix exa- adopted in 1975; the exameter has very limited practical use because galactic-scale astronomy has its own well-established unit system.
Nanometer
A nanometer is a metric unit of length equal to one billionth of a meter (1×10⁻⁹ m). It is the standard unit for measuring atomic and molecular dimensions and is widely used in physics, chemistry, and electronics.
Defined using the SI prefix nano- (from Greek nanos, "dwarf") to denote one-billionth, adopted by the General Conference on Weights and Measures (CGPM) in 1960.
Nanometers are used to measure wavelengths of visible light (400–700 nm), semiconductor transistor sizes (currently 3–5 nm process nodes), DNA double helix width (2 nm), and atomic radii. The 2019 SI redefinition fixed the meter to the speed of light, making nanometer definitions exact to atomic precision.
SI prefix nano- adopted by the CGPM in 1960; nanometer became the standard unit for nanotechnology and optical wavelengths during the late 20th century.
Exameter to Nanometer conversion formula
The relationship between exameters and nanometers:
To convert exameters to nanometers, multiply the value in exameters by 1e+27. To reverse, multiply nanometers by 1e-27.
How to use this converter
Type a value into the calculator. The result in nanometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Nanometer to Exameter converter for the reverse direction.
Step-by-step: convert exameters to nanometers
- Write down the value in exameters (Em).
- Multiply that value by the factor 1e+27.
- The product is the equivalent value in nanometers (nm).
- To reverse, multiply the nanometer value by 1e-27.
Worked examples
Example 1 — Convert 1 Em to nm:
1 × 1e+27 = 1e+27 nm
Example 2 — Convert 100 Em to nm:
100 × 1e+27 = 1e+29 nm
Exameter to Nanometer conversion table
Standard reference values for converting exameters to nanometers:
| Exameter [Em] | Nanometer [nm] |
|---|---|
| 0.01 | 1e+25 |
| 0.1 | 1e+26 |
| 1 | 1e+27 |
| 2 | 2e+27 |
| 3 | 3e+27 |
| 4 | 4e+27 |
| 5 | 5e+27 |
| 10 | 1e+28 |
| 20 | 2e+28 |
| 30 | 3e+28 |
| 40 | 4e+28 |
| 50 | 5e+28 |
| 100 | 1e+29 |
| 500 | 5e+29 |
| 1000 | 1e+30 |
Frequently asked questions
How many nanometers is 1 exameter?
How do I convert exameters to nanometers?
How do I convert nanometers back to exameters?
How many nanometers is 100 exameters?
Popular length unit conversions
Convert Exameter to other length units
Show all Exameter conversions
Metric / SI (17 units)
Imperial / US Customary (4 units)
Sources & references
Conversion factor (1 Em = 1e+27 nm) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.