Convert Atomic Mass Unit to Pennyweight
Convert atomic mass unit to pennyweights instantly. 1 atomic mass unit = 1.067752e-24 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight to Atomic Mass Unit converter for the reverse conversion.
Units explained
Atomic Mass Unit
One unified atomic mass unit (u) is defined as 1/12 the mass of a carbon-12 atom, about 1.6605E-27 kg.
Introduced to give atomic and molecular masses convenient numerical values.
Atomic, molecular, and nuclear physics and chemistry.
The unified (carbon-12) scale was adopted by IUPAC and IUPAP in 1960-1961.
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.
Atomic Mass Unit to Pennyweight conversion formula
The relationship between atomic mass unit and pennyweights:
To convert atomic mass unit to pennyweights, multiply the value in atomic mass unit by 1.067752e-24. To reverse, multiply pennyweights by 9.365469e+23.
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 Atomic Mass Unit converter for the reverse direction.
Step-by-step: convert atomic mass unit to pennyweights
- Write down the value in atomic mass unit (u).
- Multiply that value by the factor 1.067752e-24.
- The product is the equivalent value in pennyweights (dwt).
- To reverse, multiply the pennyweight value by 9.365469e+23.
Worked examples
Example 1 — Convert 1 u to dwt:
1 × 1.067752e-24 = 1.067752e-24 dwt
Example 2 — Convert 100 u to dwt:
100 × 1.067752e-24 = 1.067752e-22 dwt
Real-world example — From wavelengths to millimeter-scale objects
A value of one million atomic mass unit 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 u × 1.067752e-24 = 1.067752e-18 dwt
Real-world example — Sub-micron to millimeter
500,000 atomic mass unit converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 u × 1.067752e-24 = 5.338761e-19 dwt
Atomic Mass Unit to Pennyweight conversion table
Standard reference values for converting atomic mass unit to pennyweights:
| Atomic Mass Unit [u] | Pennyweight [dwt] |
|---|---|
| 0.01 | 1.067752e-26 |
| 0.1 | 1.067752e-25 |
| 1 | 1.067752e-24 |
| 2 | 2.135504e-24 |
| 3 | 3.203257e-24 |
| 4 | 4.271009e-24 |
| 5 | 5.338761e-24 |
| 10 | 1.067752e-23 |
| 20 | 2.135504e-23 |
| 30 | 3.203257e-23 |
| 40 | 4.271009e-23 |
| 50 | 5.338761e-23 |
| 100 | 1.067752e-22 |
| 500 | 5.338761e-22 |
| 1000 | 1.067752e-21 |
Frequently asked questions
How many pennyweights is 1 atomic mass unit?
How do I convert atomic mass unit to pennyweights?
How do I convert pennyweights back to atomic mass unit?
How many pennyweights is 100 atomic mass unit?
Popular weight unit conversions
Convert Atomic Mass Unit to other weight units
Show all Atomic Mass Unit conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (8 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 u = 1.067752e-24 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 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.