Convert Attogram to Femtogram
Convert attograms to femtograms instantly. 1 attogram = 0.001 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Attogram converter for the reverse conversion.
Units explained
Attogram
An attogram (ag) equals 10^-21 kilogram.
From the SI prefix 'atto-' (from Danish 'atten', eighteen).
Frontier nanoscience and single-molecule mass detection.
The atto- prefix was adopted by the CGPM in 1975.
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.
Attogram to Femtogram conversion formula
The relationship between attograms and femtograms:
To convert attograms to femtograms, multiply the value in attograms by 0.001. To reverse, multiply femtograms by 1000.
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 Attogram converter for the reverse direction.
Step-by-step: convert attograms to femtograms
- Write down the value in attograms (ag).
- Multiply that value by the factor 0.001.
- The product is the equivalent value in femtograms (fg).
- To reverse, multiply the femtogram value by 1000.
Worked examples
Example 1 — Convert 1 ag to fg:
1 × 0.001 = 0.001 fg
Example 2 — Convert 100 ag to fg:
100 × 0.001 = 0.1 fg
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 attograms can be re-expressed in femtograms for direct comparison with another instrument's calibration data sheet.
800 ag × 0.001 = 0.8 fg
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 attograms) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 ag × 0.001 = 0.002 fg
Attogram to Femtogram conversion table
Standard reference values for converting attograms to femtograms:
| Attogram [ag] | Femtogram [fg] |
|---|---|
| 0.01 | 1e-5 |
| 0.1 | 1e-4 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Frequently asked questions
How many femtograms is 1 attogram?
How do I convert attograms to femtograms?
How do I convert femtograms back to attograms?
How many femtograms is 100 attograms?
Popular weight unit conversions
Convert Attogram to other weight units
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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 ag = 0.001 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.