Convert Attometer to Micrometer
Convert attometers to micrometers instantly. 1 attometer = 1e-12 micrometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Micrometer to Attometer converter for the reverse conversion.
Units explained
Attometer
An attometer is a metric unit of length equal to one quintillionth of a meter (1×10⁻¹⁸ m). It is among the smallest length units in the SI system and is used almost exclusively in particle physics and theoretical work involving sub-nuclear dimensions.
The attometer was defined using the SI prefix atto- (from Danish atten, meaning eighteen), adopted by the Conférence Générale des Poids et Mesures (CGPM) in 1964 to denote one quintillionth (10⁻¹⁸).
Attometers appear in particle physics literature when describing distances comparable to or smaller than nuclear dimensions, including the range of weak nuclear interactions and theoretical Planck-scale ratios. They are rarely encountered outside specialised scientific work.
SI prefix atto- adopted in 1964; the attometer became the standard unit for sub-femtometer measurements in high-energy physics from the late 20th century onward.
Micrometer
A micrometer (also called a micron) is a metric unit of length equal to one millionth of a meter (1×10⁻⁶ m). It is the standard unit for measuring microscopic dimensions in biology, materials science, and semiconductor manufacturing.
Defined alongside the meter when France adopted the metric system in 1795, using the SI prefix micro- (from Greek mikros, "small") to denote one-millionth.
Micrometers are used to measure cell sizes, bacteria, semiconductor process nodes, fiber diameters, dust particles, and wavelengths of infrared radiation. The diameter of a human hair is about 70 μm.
Defined in 1795 as part of the original French metric system; the name "micron" was officially deprecated by the BIPM in 1967 in favor of micrometer.
Attometer to Micrometer conversion formula
The relationship between attometers and micrometers:
To convert attometers to micrometers, multiply the value in attometers by 1e-12. To reverse, multiply micrometers by 1e+12.
How to use this converter
Type a value into the calculator. The result in micrometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Micrometer to Attometer converter for the reverse direction.
Step-by-step: convert attometers to micrometers
- Write down the value in attometers (am).
- Multiply that value by the factor 1e-12.
- The product is the equivalent value in micrometers (μm).
- To reverse, multiply the micrometer value by 1e+12.
Worked examples
Example 1 — Convert 1 am to μm:
1 × 1e-12 = 1e-12 μm
Example 2 — Convert 100 am to μm:
100 × 1e-12 = 1e-10 μm
Real-world example — Sub-visible-light wavelength
500 attometers (the green-yellow visible band) equals 0.5 micrometers — the canonical conversion in optics between wavelength specifications and micron-scale lens-coating thicknesses.
500 am × 1e-12 = 5e-10 μm
Real-world example — Spanning sub-micron to micron scale
Crossing from attometers to micrometers is the everyday workflow of microscopy and semiconductor engineering — a measurement of 1000 attometers translates to a much more compact value in micrometers that fits the scale of biological cells and process nodes.
1000 am × 1e-12 = 1e-9 μm
Attometer to Micrometer conversion table
Standard reference values for converting attometers to micrometers:
| Attometer [am] | Micrometer [μm] |
|---|---|
| 0.01 | 1e-14 |
| 0.1 | 1e-13 |
| 1 | 1e-12 |
| 2 | 2e-12 |
| 3 | 3e-12 |
| 4 | 4e-12 |
| 5 | 5e-12 |
| 10 | 1e-11 |
| 20 | 2e-11 |
| 30 | 3e-11 |
| 40 | 4e-11 |
| 50 | 5e-11 |
| 100 | 1e-10 |
| 500 | 5e-10 |
| 1000 | 1e-9 |
Frequently asked questions
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Sources & references
Conversion factor (1 am = 1e-12 μm) 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.