Convert Femtogram to Atomic Mass Unit
Convert femtograms to atomic mass unit instantly. 1 femtogram = 6.022137e+8 atomic mass unit — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Atomic Mass Unit to Femtogram converter for the reverse conversion.
Units explained
Femtogram
A femtogram (fg) equals 10^-18 kilogram.
From the SI prefix 'femto-' (from Danish/Norwegian 'femten', fifteen).
Nanotechnology and high-sensitivity mass spectrometry.
The femto- prefix was adopted by the CGPM in 1975.
Atomic Mass Unit
One unified atomic mass unit (u) is defined as 1/12 the mass of a carbon-12 atom, about 1.6605E-27 kg.
Introduced to give atomic and molecular masses convenient numerical values.
Atomic, molecular, and nuclear physics and chemistry.
The unified (carbon-12) scale was adopted by IUPAC and IUPAP in 1960-1961.
Femtogram to Atomic Mass Unit conversion formula
The relationship between femtograms and atomic mass unit:
To convert femtograms to atomic mass unit, multiply the value in femtograms by 6.022137e+8. To reverse, multiply atomic mass unit by 1.66054e-9.
How to use this converter
Type a value into the calculator. The result in atomic mass unit updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Atomic Mass Unit to Femtogram converter for the reverse direction.
Step-by-step: convert femtograms to atomic mass unit
- Write down the value in femtograms (fg).
- Multiply that value by the factor 6.022137e+8.
- The product is the equivalent value in atomic mass unit (u).
- To reverse, multiply the atomic mass unit value by 1.66054e-9.
Worked examples
Example 1 — Convert 1 fg to u:
1 × 6.022137e+8 = 6.022137e+8 u
Example 2 — Convert 100 fg to u:
100 × 6.022137e+8 = 6.022137e+10 u
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 femtograms can be re-expressed in atomic mass unit for direct comparison with another instrument's calibration data sheet.
800 fg × 6.022137e+8 = 4.817709e+11 u
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 femtograms) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 fg × 6.022137e+8 = 1.204427e+9 u
Femtogram to Atomic Mass Unit conversion table
Standard reference values for converting femtograms to atomic mass unit:
| Femtogram [fg] | Atomic Mass Unit [u] |
|---|---|
| 0.01 | 6022136.65167516 |
| 0.1 | 6.022137e+7 |
| 1 | 6.022137e+8 |
| 2 | 1.204427e+9 |
| 3 | 1.806641e+9 |
| 4 | 2.408855e+9 |
| 5 | 3.011068e+9 |
| 10 | 6.022137e+9 |
| 20 | 1.204427e+10 |
| 30 | 1.806641e+10 |
| 40 | 2.408855e+10 |
| 50 | 3.011068e+10 |
| 100 | 6.022137e+10 |
| 500 | 3.011068e+11 |
| 1000 | 6.022137e+11 |
Frequently asked questions
How many atomic mass unit is 1 femtogram?
How do I convert femtograms to atomic mass unit?
How do I convert atomic mass unit back to femtograms?
How many atomic mass unit is 100 femtograms?
Popular weight unit conversions
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Metric / SI (17 units)
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Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 fg = 6.022137e+8 u) 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.