Convert Milligram to Femtogram
Convert milligrams to femtograms instantly. 1 milligram = 1e+12 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Milligram converter for the reverse conversion.
Units explained
Milligram
A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.
From the SI prefix 'milli-' (from Latin 'mille', thousand).
Standard for medicine dosing, nutrition labels, and fine jewelry.
Part of the original metric system of 1795.
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.
Milligram to Femtogram conversion formula
The relationship between milligrams and femtograms:
To convert milligrams to femtograms, multiply the value in milligrams by 1e+12. To reverse, multiply femtograms by 1e-12.
How to use this converter
Type a value into the calculator. The result in femtograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Femtogram to Milligram converter for the reverse direction.
Step-by-step: convert milligrams to femtograms
- Write down the value in milligrams (mg).
- Multiply that value by the factor 1e+12.
- The product is the equivalent value in femtograms (fg).
- To reverse, multiply the femtogram value by 1e-12.
Worked examples
Example 1 — Convert 1 mg to fg:
1 × 1e+12 = 1e+12 fg
Example 2 — Convert 100 mg to fg:
100 × 1e+12 = 1e+14 fg
Real-world example — Mid-micron to nanometer
3 milligrams equals 3,000 femtograms — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 mg × 1e+12 = 3e+12 fg
Real-world example — From microns to sub-micron features
One milligram equals one thousand femtograms — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 mg × 1e+12 = 1e+12 fg
Real-world example — Infrared to visible-spectrum mapping
A 10-milligram thermal infrared wavelength corresponds to a much larger number in femtograms, the unit favoured for ultraviolet and visible-light specifications.
10 mg × 1e+12 = 1e+13 fg
Milligram to Femtogram conversion table
Standard reference values for converting milligrams to femtograms:
| Milligram [mg] | Femtogram [fg] |
|---|---|
| 0.01 | 1e+10 |
| 0.1 | 1e+11 |
| 1 | 1e+12 |
| 2 | 2e+12 |
| 3 | 3e+12 |
| 4 | 4e+12 |
| 5 | 5e+12 |
| 10 | 1e+13 |
| 20 | 2e+13 |
| 30 | 3e+13 |
| 40 | 4e+13 |
| 50 | 5e+13 |
| 100 | 1e+14 |
| 500 | 5e+14 |
| 1000 | 1e+15 |
Frequently asked questions
How many femtograms is 1 milligram?
How do I convert milligrams to femtograms?
How do I convert femtograms back to milligrams?
How many femtograms is 100 milligrams?
Popular weight unit conversions
Convert Milligram to other weight units
Show all Milligram 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 mg = 1e+12 fg) 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.