Convert Atomic Mass Unit to Attogram
Convert atomic mass unit to attograms instantly. 1 atomic mass unit = 1.66054e-6 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram to Atomic Mass Unit converter for the reverse conversion.
Units explained
Atomic Mass Unit
One unified atomic mass unit (u) is defined as 1/12 the mass of a carbon-12 atom, about 1.6605E-27 kg.
Introduced to give atomic and molecular masses convenient numerical values.
Atomic, molecular, and nuclear physics and chemistry.
The unified (carbon-12) scale was adopted by IUPAC and IUPAP in 1960-1961.
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.
Atomic Mass Unit to Attogram conversion formula
The relationship between atomic mass unit and attograms:
To convert atomic mass unit to attograms, multiply the value in atomic mass unit by 1.66054e-6. To reverse, multiply attograms by 602213.6651675159.
How to use this converter
Type a value into the calculator. The result in attograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Attogram to Atomic Mass Unit converter for the reverse direction.
Step-by-step: convert atomic mass unit to attograms
- Write down the value in atomic mass unit (u).
- Multiply that value by the factor 1.66054e-6.
- The product is the equivalent value in attograms (ag).
- To reverse, multiply the attogram value by 602213.6651675159.
Worked examples
Example 1 — Convert 1 u to ag:
1 × 1.66054e-6 = 1.66054e-6 ag
Example 2 — Convert 100 u to ag:
100 × 1.66054e-6 = 0.000166054 ag
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 atomic mass unit) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 u × 1.66054e-6 = 3.32108e-6 ag
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 atomic mass unit can be re-expressed in attograms for direct comparison with another instrument's calibration data sheet.
800 u × 1.66054e-6 = 0.0013284322 ag
Atomic Mass Unit to Attogram conversion table
Standard reference values for converting atomic mass unit to attograms:
| Atomic Mass Unit [u] | Attogram [ag] |
|---|---|
| 0.01 | 1.66054e-8 |
| 0.1 | 1.66054e-7 |
| 1 | 1.66054e-6 |
| 2 | 3.32108e-6 |
| 3 | 4.981621e-6 |
| 4 | 6.642161e-6 |
| 5 | 8.302701e-6 |
| 10 | 1.66054e-5 |
| 20 | 3.32108e-5 |
| 30 | 4.981621e-5 |
| 40 | 6.642161e-5 |
| 50 | 8.302701e-5 |
| 100 | 0.000166054 |
| 500 | 0.0008302701 |
| 1000 | 0.0016605402 |
Frequently asked questions
How many attograms is 1 atomic mass unit?
How do I convert atomic mass unit to attograms?
How do I convert attograms back to atomic mass unit?
How many attograms is 100 atomic mass unit?
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Sources & references
Conversion factor (1 u = 1.66054e-6 ag) 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.