Convert Carat (metric) to Attogram
Convert carats (metric) to attograms instantly. 1 carat (metric) = 2e+17 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram to Carat (metric) converter for the reverse conversion.
Units explained
Carat (metric)
The metric carat (ct) equals exactly 200 milligrams (0.0002 kg).
From Arabic 'qirat' and Greek 'keration', the carob seed once used as a counterweight.
The worldwide standard for gemstone and diamond mass.
The metric carat was fixed at 200 mg internationally in 1907.
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.
Carat (metric) to Attogram conversion formula
The relationship between carats (metric) and attograms:
To convert carats (metric) to attograms, multiply the value in carats (metric) by 2e+17. To reverse, multiply attograms by 5e-18.
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 Carat (metric) converter for the reverse direction.
Step-by-step: convert carats (metric) to attograms
- Write down the value in carats (metric) (ct).
- Multiply that value by the factor 2e+17.
- The product is the equivalent value in attograms (ag).
- To reverse, multiply the attogram value by 5e-18.
Worked examples
Example 1 — Convert 1 ct to ag:
1 × 2e+17 = 2e+17 ag
Example 2 — Convert 100 ct to ag:
100 × 2e+17 = 2e+19 ag
Real-world example — Mid-micron to nanometer
3 carats (metric) equals 3,000 attograms — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 ct × 2e+17 = 6e+17 ag
Real-world example — From microns to sub-micron features
One carat (metric) equals one thousand attograms — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 ct × 2e+17 = 2e+17 ag
Real-world example — Infrared to visible-spectrum mapping
A 10-carat (metric) thermal infrared wavelength corresponds to a much larger number in attograms, the unit favoured for ultraviolet and visible-light specifications.
10 ct × 2e+17 = 2e+18 ag
Carat (metric) to Attogram conversion table
Standard reference values for converting carats (metric) to attograms:
| Carat (metric) [ct] | Attogram [ag] |
|---|---|
| 0.01 | 2e+15 |
| 0.1 | 2e+16 |
| 1 | 2e+17 |
| 2 | 4e+17 |
| 3 | 6e+17 |
| 4 | 8e+17 |
| 5 | 1e+18 |
| 10 | 2e+18 |
| 20 | 4e+18 |
| 30 | 6e+18 |
| 40 | 8e+18 |
| 50 | 1e+19 |
| 100 | 2e+19 |
| 500 | 1e+20 |
| 1000 | 2e+20 |
Frequently asked questions
How many attograms is 1 carat (metric)?
How do I convert carats (metric) to attograms?
How do I convert attograms back to carats (metric)?
How many attograms is 100 carats (metric)?
Popular weight unit conversions
Convert Carat (metric) to other weight units
Show all Carat (metric) conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 ct = 2e+17 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 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.