Convert Microgram to Pennyweight
Convert micrograms to pennyweights instantly. 1 microgram = 6.430149e-7 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight 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.
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.
Microgram to Pennyweight conversion formula
The relationship between micrograms and pennyweights:
To convert micrograms to pennyweights, multiply the value in micrograms by 6.430149e-7. To reverse, multiply pennyweights by 1555173.7999999998.
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 Microgram converter for the reverse direction.
Step-by-step: convert micrograms to pennyweights
- Write down the value in micrograms (µg).
- Multiply that value by the factor 6.430149e-7.
- The product is the equivalent value in pennyweights (dwt).
- To reverse, multiply the pennyweight value by 1555173.7999999998.
Worked examples
Example 1 — Convert 1 µg to dwt:
1 × 6.430149e-7 = 6.430149e-7 dwt
Example 2 — Convert 100 µg to dwt:
100 × 6.430149e-7 = 6.430149e-5 dwt
Real-world example — Sub-micron to millimeter
500,000 micrograms converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 µg × 6.430149e-7 = 0.321507474 dwt
Real-world example — From wavelengths to millimeter-scale objects
A value of one million micrograms 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 µg × 6.430149e-7 = 0.6430149479 dwt
Microgram to Pennyweight conversion table
Standard reference values for converting micrograms to pennyweights:
| Microgram [µg] | Pennyweight [dwt] |
|---|---|
| 0.01 | 6.430149e-9 |
| 0.1 | 6.430149e-8 |
| 1 | 6.430149e-7 |
| 2 | 1.28603e-6 |
| 3 | 1.929045e-6 |
| 4 | 2.57206e-6 |
| 5 | 3.215075e-6 |
| 10 | 6.430149e-6 |
| 20 | 1.28603e-5 |
| 30 | 1.929045e-5 |
| 40 | 2.57206e-5 |
| 50 | 3.215075e-5 |
| 100 | 6.430149e-5 |
| 500 | 0.0003215075 |
| 1000 | 0.0006430149 |
Frequently asked questions
How many pennyweights is 1 microgram?
How do I convert micrograms to pennyweights?
How do I convert pennyweights back to micrograms?
How many pennyweights is 100 micrograms?
Popular weight unit conversions
Convert Microgram 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 µg = 6.430149e-7 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.