Convert Pennyweight to Troy Ounce
Convert pennyweights to troy ounces instantly. 1 pennyweight = 0.0499999987 troy ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Troy 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.
Troy Ounce
The troy ounce (ozt) equals about 31.103 grams, one-twelfth of a troy pound.
From the Troy system of weights associated with Troyes, France.
The global standard for pricing gold, silver, platinum, and palladium.
Established in the medieval Troy system and retained for precious metals.
Pennyweight to Troy Ounce conversion formula
The relationship between pennyweights and troy ounces:
To convert pennyweights to troy ounces, multiply the value in pennyweights by 0.0499999987. To reverse, multiply troy ounces by 20.0000005144.
How to use this converter
Type a value into the calculator. The result in troy 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 Troy Ounce to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to troy ounces
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 0.0499999987.
- The product is the equivalent value in troy ounces (oz t).
- To reverse, multiply the troy ounce value by 20.0000005144.
Worked examples
Example 1 — Convert 1 dwt to oz t:
1 × 0.0499999987 = 0.0499999987 oz t
Example 2 — Convert 100 dwt to oz t:
100 × 0.0499999987 = 4.9999998714 oz t
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to troy ounces is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 0.0499999987 = 0.2499999936 oz t
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to troy ounces — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 0.0499999987 = 1.4999999614 oz t
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 troy ounces daily when mixing metric and imperial tools.
10 dwt × 0.0499999987 = 0.4999999871 oz t
Pennyweight to Troy Ounce conversion table
Standard reference values for converting pennyweights to troy ounces:
| Pennyweight [dwt] | Troy Ounce [oz t] |
|---|---|
| 0.01 | 0.0005 |
| 0.1 | 0.0049999999 |
| 1 | 0.0499999987 |
| 2 | 0.0999999974 |
| 3 | 0.1499999961 |
| 4 | 0.1999999949 |
| 5 | 0.2499999936 |
| 10 | 0.4999999871 |
| 20 | 0.9999999743 |
| 30 | 1.4999999614 |
| 40 | 1.9999999486 |
| 50 | 2.4999999357 |
| 100 | 4.9999998714 |
| 500 | 24.999999357 |
| 1000 | 49.999998714 |
Frequently asked questions
How many troy ounces is 1 pennyweight?
How do I convert pennyweights to troy ounces?
How do I convert troy ounces back to pennyweights?
How many troy 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 = 0.0499999987 oz t) 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.