Convert Micrometer to Attometer
Convert micrometers to attometers instantly. 1 micrometer = 1e+12 attometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attometer to Micrometer converter for the reverse conversion.
Units explained
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
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 to Attometer conversion formula
The relationship between micrometers and attometers:
To convert micrometers to attometers, multiply the value in micrometers by 1e+12. To reverse, multiply attometers by 1e-12.
How to use this converter
Type a value into the calculator. The result in attometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Attometer to Micrometer converter for the reverse direction.
Step-by-step: convert micrometers to attometers
- Write down the value in micrometers (μm).
- Multiply that value by the factor 1e+12.
- The product is the equivalent value in attometers (am).
- To reverse, multiply the attometer value by 1e-12.
Worked examples
Example 1 — Convert 1 μm to am:
1 × 1e+12 = 1e+12 am
Example 2 — Convert 100 μm to am:
100 × 1e+12 = 1e+14 am
Real-world example — Infrared to visible-spectrum mapping
A 10-micrometer thermal infrared wavelength corresponds to a much larger number in attometers, the unit favoured for ultraviolet and visible-light specifications.
10 μm × 1e+12 = 1e+13 am
Real-world example — Mid-micron to nanometer
3 micrometers equals 3,000 attometers — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 μm × 1e+12 = 3e+12 am
Real-world example — From microns to sub-micron features
One micrometer equals one thousand attometers — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 μm × 1e+12 = 1e+12 am
Micrometer to Attometer conversion table
Standard reference values for converting micrometers to attometers:
| Micrometer [μm] | Attometer [am] |
|---|---|
| 0.01 | 1e+10 |
| 0.1 | 1e+11 |
| 1 | 1e+12 |
| 2 | 2e+12 |
| 3 | 3e+12 |
| 4 | 4e+12 |
| 5 | 5e+12 |
| 10 | 1e+13 |
| 20 | 2e+13 |
| 30 | 3e+13 |
| 40 | 4e+13 |
| 50 | 5e+13 |
| 100 | 1e+14 |
| 500 | 5e+14 |
| 1000 | 1e+15 |
Frequently asked questions
How many attometers is 1 micrometer?
How do I convert micrometers to attometers?
How do I convert attometers back to micrometers?
How many attometers is 100 micrometers?
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Sources & references
Conversion factor (1 μm = 1e+12 am) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.