Convert Hectogram to Femtogram
Convert hectograms to femtograms instantly. 1 hectogram = 1e+17 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Hectogram converter for the reverse conversion.
Units explained
Hectogram
A hectogram (hg) equals 0.1 kilogram, or 100 grams.
From the SI prefix 'hecto-' (from Greek 'hekaton', hundred).
Common in continental European food retail, especially Italy ('etto').
The hecto- prefix dates to 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.
Hectogram to Femtogram conversion formula
The relationship between hectograms and femtograms:
To convert hectograms to femtograms, multiply the value in hectograms by 1e+17. To reverse, multiply femtograms by 1e-17.
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 Hectogram converter for the reverse direction.
Step-by-step: convert hectograms to femtograms
- Write down the value in hectograms (hg).
- Multiply that value by the factor 1e+17.
- The product is the equivalent value in femtograms (fg).
- To reverse, multiply the femtogram value by 1e-17.
Worked examples
Example 1 — Convert 1 hg to fg:
1 × 1e+17 = 1e+17 fg
Example 2 — Convert 100 hg to fg:
100 × 1e+17 = 1e+19 fg
Real-world example — Meter to nanoscale
One hectogram equals one billion femtograms. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.
1 hg × 1e+17 = 1e+17 fg
Real-world example — Human-scale to atomic dimensions
One hectogram equals one billion femtograms — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.
1 hg × 1e+17 = 1e+17 fg
Hectogram to Femtogram conversion table
Standard reference values for converting hectograms to femtograms:
| Hectogram [hg] | Femtogram [fg] |
|---|---|
| 0.01 | 1e+15 |
| 0.1 | 1e+16 |
| 1 | 1e+17 |
| 2 | 2e+17 |
| 3 | 3e+17 |
| 4 | 4e+17 |
| 5 | 5e+17 |
| 10 | 1e+18 |
| 20 | 2e+18 |
| 30 | 3e+18 |
| 40 | 4e+18 |
| 50 | 5e+18 |
| 100 | 1e+19 |
| 500 | 5e+19 |
| 1000 | 1e+20 |
Frequently asked questions
How many femtograms is 1 hectogram?
How do I convert hectograms to femtograms?
How do I convert femtograms back to hectograms?
How many femtograms is 100 hectograms?
Popular weight unit conversions
Convert Hectogram to other weight units
Show all Hectogram 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 hg = 1e+17 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 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.