Convert Femtogram to Slug
Convert femtograms to slugs instantly. 1 femtogram = 6.852177e-20 slug — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Slug 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.
Slug
The slug is the mass that accelerates at 1 ft/s^2 under a force of one pound-force, about 14.59 kg.
Coined in the early 20th century for the British gravitational (engineering) system.
US and British engineering dynamics.
Introduced in the British gravitational system of units.
Femtogram to Slug conversion formula
The relationship between femtograms and slugs:
To convert femtograms to slugs, multiply the value in femtograms by 6.852177e-20. To reverse, multiply slugs by 1.45939e+19.
How to use this converter
Type a value into the calculator. The result in slugs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Slug to Femtogram converter for the reverse direction.
Step-by-step: convert femtograms to slugs
- Write down the value in femtograms (fg).
- Multiply that value by the factor 6.852177e-20.
- The product is the equivalent value in slugs (slug).
- To reverse, multiply the slug value by 1.45939e+19.
Worked examples
Example 1 — Convert 1 fg to slug:
1 × 6.852177e-20 = 6.852177e-20 slug
Example 2 — Convert 100 fg to slug:
100 × 6.852177e-20 = 6.852177e-18 slug
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 × 6.852177e-20 = 1.370435e-19 slug
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 slugs for direct comparison with another instrument's calibration data sheet.
800 fg × 6.852177e-20 = 5.481741e-17 slug
Femtogram to Slug conversion table
Standard reference values for converting femtograms to slugs:
| Femtogram [fg] | Slug [slug] |
|---|---|
| 0.01 | 6.852177e-22 |
| 0.1 | 6.852177e-21 |
| 1 | 6.852177e-20 |
| 2 | 1.370435e-19 |
| 3 | 2.055653e-19 |
| 4 | 2.740871e-19 |
| 5 | 3.426088e-19 |
| 10 | 6.852177e-19 |
| 20 | 1.370435e-18 |
| 30 | 2.055653e-18 |
| 40 | 2.740871e-18 |
| 50 | 3.426088e-18 |
| 100 | 6.852177e-18 |
| 500 | 3.426088e-17 |
| 1000 | 6.852177e-17 |
Frequently asked questions
How many slugs is 1 femtogram?
How do I convert femtograms to slugs?
How do I convert slugs back to femtograms?
How many slugs is 100 femtograms?
Popular weight unit conversions
Convert Femtogram to other weight units
Show all Femtogram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
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 = 6.852177e-20 slug) 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.