Convert Attogram to Pennyweight
Convert attograms to pennyweights instantly. 1 attogram = 6.430149e-19 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight 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.
Pennyweight
The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).
From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.
Jewelry making and precious-metal scrap valuation in the US.
Derived from the medieval English coinage system.
Attogram to Pennyweight conversion formula
The relationship between attograms and pennyweights:
To convert attograms to pennyweights, multiply the value in attograms by 6.430149e-19. To reverse, multiply pennyweights by 1.555174e+18.
How to use this converter
Type a value into the calculator. The result in pennyweights updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Pennyweight to Attogram converter for the reverse direction.
Step-by-step: convert attograms to pennyweights
- Write down the value in attograms (ag).
- Multiply that value by the factor 6.430149e-19.
- The product is the equivalent value in pennyweights (dwt).
- To reverse, multiply the pennyweight value by 1.555174e+18.
Worked examples
Example 1 — Convert 1 ag to dwt:
1 × 6.430149e-19 = 6.430149e-19 dwt
Example 2 — Convert 100 ag to dwt:
100 × 6.430149e-19 = 6.430149e-17 dwt
Real-world example — Sub-micron to millimeter
500,000 attograms converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 ag × 6.430149e-19 = 3.215075e-13 dwt
Real-world example — From wavelengths to millimeter-scale objects
A value of one million attograms sounds vast at the atomic scale but converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.
1000000 ag × 6.430149e-19 = 6.430149e-13 dwt
Attogram to Pennyweight conversion table
Standard reference values for converting attograms to pennyweights:
| Attogram [ag] | Pennyweight [dwt] |
|---|---|
| 0.01 | 6.430149e-21 |
| 0.1 | 6.430149e-20 |
| 1 | 6.430149e-19 |
| 2 | 1.28603e-18 |
| 3 | 1.929045e-18 |
| 4 | 2.57206e-18 |
| 5 | 3.215075e-18 |
| 10 | 6.430149e-18 |
| 20 | 1.28603e-17 |
| 30 | 1.929045e-17 |
| 40 | 2.57206e-17 |
| 50 | 3.215075e-17 |
| 100 | 6.430149e-17 |
| 500 | 3.215075e-16 |
| 1000 | 6.430149e-16 |
Frequently asked questions
How many pennyweights is 1 attogram?
How do I convert attograms to pennyweights?
How do I convert pennyweights back to attograms?
How many pennyweights is 100 attograms?
Popular weight unit conversions
Convert Attogram to other weight units
Show all Attogram 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 ag = 6.430149e-19 dwt) 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.