Convert Pennyweight to Ounce
Convert pennyweights to ounces instantly. 1 pennyweight = 0.0548571415 ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ounce 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.
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
Pennyweight to Ounce conversion formula
The relationship between pennyweights and ounces:
To convert pennyweights to ounces, multiply the value in pennyweights by 0.0548571415. To reverse, multiply ounces by 18.2291671195.
How to use this converter
Type a value into the calculator. The result in ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ounce to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to ounces
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 0.0548571415.
- The product is the equivalent value in ounces (oz).
- To reverse, multiply the ounce value by 18.2291671195.
Worked examples
Example 1 — Convert 1 dwt to oz:
1 × 0.0548571415 = 0.0548571415 oz
Example 2 — Convert 100 dwt to oz:
100 × 0.0548571415 = 5.4857141495 oz
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to ounces — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 0.0548571415 = 1.6457142448 oz
Real-world example — Hardware-scale dimensions
A 10-pennyweight fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between pennyweights and ounces daily when mixing metric and imperial tools.
10 dwt × 0.0548571415 = 0.5485714149 oz
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to ounces is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 0.0548571415 = 0.2742857075 oz
Pennyweight to Ounce conversion table
Standard reference values for converting pennyweights to ounces:
| Pennyweight [dwt] | Ounce [oz] |
|---|---|
| 0.01 | 0.0005485714 |
| 0.1 | 0.0054857141 |
| 1 | 0.0548571415 |
| 2 | 0.109714283 |
| 3 | 0.1645714245 |
| 4 | 0.219428566 |
| 5 | 0.2742857075 |
| 10 | 0.5485714149 |
| 20 | 1.0971428299 |
| 30 | 1.6457142448 |
| 40 | 2.1942856598 |
| 50 | 2.7428570747 |
| 100 | 5.4857141495 |
| 500 | 27.4285707473 |
| 1000 | 54.8571414946 |
Frequently asked questions
How many ounces is 1 pennyweight?
How do I convert pennyweights to ounces?
How do I convert ounces back to pennyweights?
How many ounces 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 = 0.0548571415 oz) 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.