Convert Pennyweight to Microgram
Convert pennyweights to micrograms instantly. 1 pennyweight = 1555173.8 microgram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Microgram to Pennyweight converter for the reverse conversion.
Units explained
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
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 to Microgram conversion formula
The relationship between pennyweights and micrograms:
To convert pennyweights to micrograms, multiply the value in pennyweights by 1555173.8. To reverse, multiply micrograms by 6.430149e-7.
How to use this converter
Type a value into the calculator. The result in micrograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Microgram to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to micrograms
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 1555173.8.
- The product is the equivalent value in micrograms (µg).
- To reverse, multiply the microgram value by 6.430149e-7.
Worked examples
Example 1 — Convert 1 dwt to µg:
1 × 1555173.8 = 1555173.8 µg
Example 2 — Convert 100 dwt to µg:
100 × 1555173.8 = 1.555174e+8 µg
Real-world example — Small-scale to atomic-scale
One pennyweight equals 10 million micrograms — useful for physics curricula that relate everyday measurements to atomic and optical scales.
1 dwt × 1555173.8 = 1555173.8 µg
Real-world example — Centimeter to wavelength scale
One pennyweight equals 10 million micrograms. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.
1 dwt × 1555173.8 = 1555173.8 µg
Pennyweight to Microgram conversion table
Standard reference values for converting pennyweights to micrograms:
| Pennyweight [dwt] | Microgram [µg] |
|---|---|
| 0.01 | 15551.738 |
| 0.1 | 155517.38 |
| 1 | 1555173.8 |
| 2 | 3110347.6000000001 |
| 3 | 4665521.4000000004 |
| 4 | 6220695.2000000002 |
| 5 | 7775869 |
| 10 | 1.555174e+7 |
| 20 | 3.110348e+7 |
| 30 | 4.665521e+7 |
| 40 | 6.220695e+7 |
| 50 | 7.775869e+7 |
| 100 | 1.555174e+8 |
| 500 | 7.775869e+8 |
| 1000 | 1.555174e+9 |
Frequently asked questions
How many micrograms is 1 pennyweight?
How do I convert pennyweights to micrograms?
How do I convert micrograms back to pennyweights?
How many micrograms is 100 pennyweights?
Popular weight unit conversions
Convert Pennyweight to other weight units
Show all Pennyweight 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 dwt = 1555173.8 µg) 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.