Convert Square Femtometer to Square Micrometer
Convert square femtometers to square micrometers instantly. 1 square femtometer = 1e-18 square micrometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Micrometer to Square Femtometer converter for the reverse conversion.
Units explained
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 Micrometer
A square micrometer is a metric unit of area equal to 10⁻¹² m² (1 µm × 1 µm). It is widely used in microscopy, semiconductor manufacturing, and cell biology.
Derived by squaring the micrometer (10⁻⁶ m). The micro- prefix comes from the Greek 'mikros' (small).
Square micrometers express the cross-sectional area of cells, semiconductor features, microfluidic channels, and microscopy fields of view. Modern CPU transistors have feature areas of a few nm² to tens of nm².
Micrometer adopted into SI in 1960.
Square Femtometer to Square Micrometer conversion formula
The relationship between square femtometers and square micrometers:
To convert square femtometers to square micrometers, multiply the value in square femtometers by 1e-18. To reverse, multiply square micrometers by 1e+18.
How to use this converter
Type a value into the calculator. The result in square 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 Square Micrometer to Square Femtometer converter for the reverse direction.
Step-by-step: convert square femtometers to square micrometers
- Write down the value in square femtometers (fm²).
- Multiply that value by the factor 1e-18.
- The product is the equivalent value in square micrometers (µm²).
- To reverse, multiply the square micrometer value by 1e+18.
Worked examples
Example 1 — Convert 1 fm² to µm²:
1 × 1e-18 = 1e-18 µm²
Example 2 — Convert 100 fm² to µm²:
100 × 1e-18 = 1e-16 µm²
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 square femtometers) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 fm² × 1e-18 = 2e-18 µm²
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 femtometers can be re-expressed in square micrometers for direct comparison with another instrument's calibration data sheet.
800 fm² × 1e-18 = 8e-16 µm²
Square Femtometer to Square Micrometer conversion table
Standard reference values for converting square femtometers to square micrometers:
| Square Femtometer [fm²] | Square Micrometer [µm²] |
|---|---|
| 0.01 | 1e-20 |
| 0.1 | 1e-19 |
| 1 | 1e-18 |
| 2 | 2e-18 |
| 3 | 3e-18 |
| 4 | 4e-18 |
| 5 | 5e-18 |
| 10 | 1e-17 |
| 20 | 2e-17 |
| 30 | 3e-17 |
| 40 | 4e-17 |
| 50 | 5e-17 |
| 100 | 1e-16 |
| 500 | 5e-16 |
| 1000 | 1e-15 |
Frequently asked questions
How many square micrometers is 1 square femtometer?
How do I convert square femtometers to square micrometers?
How do I convert square micrometers back to square femtometers?
How many square micrometers is 100 square femtometers?
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Metric / SI (15 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 fm² = 1e-18 µm²) 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.