Convert Femtogram to Metric Ton
Convert femtograms to metric tons instantly. 1 femtogram = 1e-21 metric ton — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Metric Ton 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.
Metric Ton
The metric ton (t) equals exactly 1,000 kilograms; it is also called the tonne.
From 'tun', a large medieval cask; 'metric' distinguishes it from imperial tons.
The global standard for trade, freight, and heavy industry.
Recognized internationally with the spread of the metric system in the late 19th century.
Femtogram to Metric Ton conversion formula
The relationship between femtograms and metric tons:
To convert femtograms to metric tons, multiply the value in femtograms by 1e-21. To reverse, multiply metric tons by 1e+21.
How to use this converter
Type a value into the calculator. The result in metric tons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Metric Ton to Femtogram converter for the reverse direction.
Step-by-step: convert femtograms to metric tons
- Write down the value in femtograms (fg).
- Multiply that value by the factor 1e-21.
- The product is the equivalent value in metric tons (t).
- To reverse, multiply the metric ton value by 1e+21.
Worked examples
Example 1 — Convert 1 fg to t:
1 × 1e-21 = 1e-21 t
Example 2 — Convert 100 fg to t:
100 × 1e-21 = 1e-19 t
Real-world example — Twelve orders of magnitude
A trillion femtograms maps to a single, recognizable distance in metric tons. This kind of conversion arises in cosmology and electromagnetic-spectrum exercises where atomic and astronomical scales sit side by side.
1e+12 fg × 1e-21 = 1e-9 t
Real-world example — Wavelength to road distance
A trillion femtograms equals one metric ton — the kind of conversion that appears in physics problems spanning the electromagnetic spectrum across many orders of magnitude.
1e+12 fg × 1e-21 = 1e-9 t
Femtogram to Metric Ton conversion table
Standard reference values for converting femtograms to metric tons:
| Femtogram [fg] | Metric Ton [t] |
|---|---|
| 0.01 | 1e-23 |
| 0.1 | 1e-22 |
| 1 | 1e-21 |
| 2 | 2e-21 |
| 3 | 3e-21 |
| 4 | 4e-21 |
| 5 | 5e-21 |
| 10 | 1e-20 |
| 20 | 2e-20 |
| 30 | 3e-20 |
| 40 | 4e-20 |
| 50 | 5e-20 |
| 100 | 1e-19 |
| 500 | 5e-19 |
| 1000 | 1e-18 |
Frequently asked questions
How many metric tons is 1 femtogram?
How do I convert femtograms to metric tons?
How do I convert metric tons back to femtograms?
How many metric tons 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-21 t) 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.