Convert Square Attometer to Square Femtometer
Convert square attometers to square femtometers instantly. 1 square attometer = 1e-6 square femtometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Femtometer to Square Attometer converter for the reverse conversion.
Units explained
Square Attometer
A square attometer is a metric unit of area equal to 10⁻³⁶ m². It is used in theoretical particle physics when discussing cross-sections at the sub-femtometer scale.
Derived by squaring the attometer (10⁻¹⁸ m). The atto- prefix was adopted by the CGPM in 1964 from the Danish 'atten' (eighteen), denoting 10⁻¹⁸.
Square attometers can appear in particle physics literature comparing extremely small interaction cross-sections, though more often barns (10⁻²⁸ m²) are used at this scale.
SI prefix atto- adopted in 1964; remains a defined unit, rarely used in practice.
Square Femtometer
A square femtometer is a metric unit of area equal to 10⁻³⁰ m². It is used in nuclear and particle physics to describe interaction cross-sections at the nuclear scale.
Derived by squaring the femtometer (10⁻¹⁵ m), historically known as the fermi after physicist Enrico Fermi.
Square femtometers are equivalent to 0.01 barn. They appear in particle physics literature comparing strong interaction cross-sections and hadron sizes.
Femtometer adopted into SI in 1964; the fermi nomenclature predates this from mid-20th century nuclear physics.
Square Attometer to Square Femtometer conversion formula
The relationship between square attometers and square femtometers:
To convert square attometers to square femtometers, multiply the value in square attometers by 1e-6. To reverse, multiply square femtometers by 1000000.
How to use this converter
Type a value into the calculator. The result in square femtometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Femtometer to Square Attometer converter for the reverse direction.
Step-by-step: convert square attometers to square femtometers
- Write down the value in square attometers (am²).
- Multiply that value by the factor 1e-6.
- The product is the equivalent value in square femtometers (fm²).
- To reverse, multiply the square femtometer value by 1000000.
Worked examples
Example 1 — Convert 1 am² to fm²:
1 × 1e-6 = 1e-6 fm²
Example 2 — Convert 100 am² to fm²:
100 × 1e-6 = 1e-4 fm²
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 square attometers) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 am² × 1e-6 = 2e-6 fm²
Real-world example — Wavelengths across the spectrum
Optical and atomic-scale phenomena are routinely cross-converted between sub-micron units. A photon of wavelength 800 square attometers can be re-expressed in square femtometers for direct comparison with another instrument's calibration data sheet.
800 am² × 1e-6 = 0.0008 fm²
Square Attometer to Square Femtometer conversion table
Standard reference values for converting square attometers to square femtometers:
| Square Attometer [am²] | Square Femtometer [fm²] |
|---|---|
| 0.01 | 1e-8 |
| 0.1 | 1e-7 |
| 1 | 1e-6 |
| 2 | 2e-6 |
| 3 | 3e-6 |
| 4 | 4e-6 |
| 5 | 5e-6 |
| 10 | 1e-5 |
| 20 | 2e-5 |
| 30 | 3e-5 |
| 40 | 4e-5 |
| 50 | 5e-5 |
| 100 | 1e-4 |
| 500 | 0.0005 |
| 1000 | 0.001 |
Frequently asked questions
How many square femtometers is 1 square attometer?
How do I convert square attometers to square femtometers?
How do I convert square femtometers back to square attometers?
How many square femtometers is 100 square attometers?
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Metric / SI (15 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 am² = 1e-6 fm²) 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.