Convert Microgram to Attogram
Convert micrograms to attograms instantly. 1 microgram = 1e+12 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram to Microgram converter for the reverse conversion.
Units explained
Microgram
A microgram (ug) equals 10^-9 kilogram, or one-millionth of a gram.
From the SI prefix 'micro-' (from Greek 'mikros', small).
Trace nutrients, potent drug doses, and environmental contaminant levels.
The micro- prefix was incorporated into the SI in 1960.
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.
Microgram to Attogram conversion formula
The relationship between micrograms and attograms:
To convert micrograms to attograms, multiply the value in micrograms by 1e+12. To reverse, multiply attograms by 1e-12.
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 Microgram converter for the reverse direction.
Step-by-step: convert micrograms to attograms
- Write down the value in micrograms (µg).
- Multiply that value by the factor 1e+12.
- The product is the equivalent value in attograms (ag).
- To reverse, multiply the attogram value by 1e-12.
Worked examples
Example 1 — Convert 1 µg to ag:
1 × 1e+12 = 1e+12 ag
Example 2 — Convert 100 µg to ag:
100 × 1e+12 = 1e+14 ag
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 micrograms) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 µg × 1e+12 = 2e+12 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 micrograms can be re-expressed in attograms for direct comparison with another instrument's calibration data sheet.
800 µg × 1e+12 = 8e+14 ag
Microgram to Attogram conversion table
Standard reference values for converting micrograms to attograms:
| Microgram [µg] | Attogram [ag] |
|---|---|
| 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 attograms is 1 microgram?
How do I convert micrograms to attograms?
How do I convert attograms back to micrograms?
How many attograms is 100 micrograms?
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Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 µg = 1e+12 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.