Convert Pennyweight to Atomic Mass Unit
Convert pennyweights to atomic mass unit instantly. 1 pennyweight = 9.365469e+23 atomic mass unit — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Atomic Mass Unit 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.
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 to Atomic Mass Unit conversion formula
The relationship between pennyweights and atomic mass unit:
To convert pennyweights to atomic mass unit, multiply the value in pennyweights by 9.365469e+23. To reverse, multiply atomic mass unit by 1.067752e-24.
How to use this converter
Type a value into the calculator. The result in atomic mass unit updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Atomic Mass Unit to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to atomic mass unit
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 9.365469e+23.
- The product is the equivalent value in atomic mass unit (u).
- To reverse, multiply the atomic mass unit value by 1.067752e-24.
Worked examples
Example 1 — Convert 1 dwt to u:
1 × 9.365469e+23 = 9.365469e+23 u
Example 2 — Convert 100 dwt to u:
100 × 9.365469e+23 = 9.365469e+25 u
Real-world example — Centimeter to wavelength scale
One pennyweight equals 10 million atomic mass unit. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.
1 dwt × 9.365469e+23 = 9.365469e+23 u
Real-world example — Small-scale to atomic-scale
One pennyweight equals 10 million atomic mass unit — useful for physics curricula that relate everyday measurements to atomic and optical scales.
1 dwt × 9.365469e+23 = 9.365469e+23 u
Pennyweight to Atomic Mass Unit conversion table
Standard reference values for converting pennyweights to atomic mass unit:
| Pennyweight [dwt] | Atomic Mass Unit [u] |
|---|---|
| 0.01 | 9.365469e+21 |
| 0.1 | 9.365469e+22 |
| 1 | 9.365469e+23 |
| 2 | 1.873094e+24 |
| 3 | 2.809641e+24 |
| 4 | 3.746188e+24 |
| 5 | 4.682735e+24 |
| 10 | 9.365469e+24 |
| 20 | 1.873094e+25 |
| 30 | 2.809641e+25 |
| 40 | 3.746188e+25 |
| 50 | 4.682735e+25 |
| 100 | 9.365469e+25 |
| 500 | 4.682735e+26 |
| 1000 | 9.365469e+26 |
Frequently asked questions
How many atomic mass unit is 1 pennyweight?
How do I convert pennyweights to atomic mass unit?
How do I convert atomic mass unit back to pennyweights?
How many atomic mass unit is 100 pennyweights?
Popular weight unit conversions
Convert Pennyweight to other weight units
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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 = 9.365469e+23 u) 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.