Convert Femtogram to Microgram
Convert femtograms to micrograms instantly. 1 femtogram = 1e-9 microgram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Microgram 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.
Microgram
A microgram (ug) equals 10^-9 kilogram, or one-millionth of a gram.
From the SI prefix 'micro-' (from Greek 'mikros', small).
Trace nutrients, potent drug doses, and environmental contaminant levels.
The micro- prefix was incorporated into the SI in 1960.
Femtogram to Microgram conversion formula
The relationship between femtograms and micrograms:
To convert femtograms to micrograms, multiply the value in femtograms by 1e-9. To reverse, multiply micrograms by 1e+9.
How to use this converter
Type a value into the calculator. The result in micrograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Microgram to Femtogram converter for the reverse direction.
Step-by-step: convert femtograms to micrograms
- Write down the value in femtograms (fg).
- Multiply that value by the factor 1e-9.
- The product is the equivalent value in micrograms (µg).
- To reverse, multiply the microgram value by 1e+9.
Worked examples
Example 1 — Convert 1 fg to µg:
1 × 1e-9 = 1e-9 µg
Example 2 — Convert 100 fg to µg:
100 × 1e-9 = 1e-7 µg
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 micrograms for direct comparison with another instrument's calibration data sheet.
800 fg × 1e-9 = 8e-7 µg
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 × 1e-9 = 2e-9 µg
Femtogram to Microgram conversion table
Standard reference values for converting femtograms to micrograms:
| Femtogram [fg] | Microgram [µg] |
|---|---|
| 0.01 | 1e-11 |
| 0.1 | 1e-10 |
| 1 | 1e-9 |
| 2 | 2e-9 |
| 3 | 3e-9 |
| 4 | 4e-9 |
| 5 | 5e-9 |
| 10 | 1e-8 |
| 20 | 2e-8 |
| 30 | 3e-8 |
| 40 | 4e-8 |
| 50 | 5e-8 |
| 100 | 1e-7 |
| 500 | 5e-7 |
| 1000 | 1e-6 |
Frequently asked questions
How many micrograms is 1 femtogram?
How do I convert femtograms to micrograms?
How do I convert micrograms back to femtograms?
How many micrograms 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 = 1e-9 µg) 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.