Convert Pennyweight to Wey
Convert pennyweights to weys instantly. 1 pennyweight = 1.360544e-5 wey — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Wey 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.
Wey
The wey was an English bulk weight, here taken as 252 pounds (about 114.3 kg).
From Old English 'waege', a weighing or balance.
Obsolete English unit for wool, cheese, and salt.
Used in medieval and early-modern English trade.
Pennyweight to Wey conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between pennyweights and weys:
To convert pennyweights to weys, multiply the value in pennyweights by 1.360544e-5. To reverse, multiply weys by 73500.0018904639.
How to use this converter
Type a value into the calculator. The result in weys updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Wey to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to weys
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 1.360544e-5.
- The product is the equivalent value in weys (wey).
- To reverse, multiply the wey value by 73500.0018904639.
Worked examples
Example 1 — Convert 1 dwt to wey:
1 × 1.360544e-5 = 1.360544e-5 wey
Example 2 — Convert 100 dwt to wey:
100 × 1.360544e-5 = 0.0013605442 wey
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 weys daily when mixing metric and imperial tools.
10 dwt × 1.360544e-5 = 0.0001360544 wey
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to weys is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 1.360544e-5 = 6.802721e-5 wey
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to weys — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 1.360544e-5 = 0.0004081633 wey
Pennyweight to Wey conversion table
Standard reference values for converting pennyweights to weys:
| Pennyweight [dwt] | Wey [wey] |
|---|---|
| 0.01 | 1.360544e-7 |
| 0.1 | 1.360544e-6 |
| 1 | 1.360544e-5 |
| 2 | 2.721088e-5 |
| 3 | 4.081633e-5 |
| 4 | 5.442177e-5 |
| 5 | 6.802721e-5 |
| 10 | 0.0001360544 |
| 20 | 0.0002721088 |
| 30 | 0.0004081633 |
| 40 | 0.0005442177 |
| 50 | 0.0006802721 |
| 100 | 0.0013605442 |
| 500 | 0.0068027209 |
| 1000 | 0.0136054418 |
Frequently asked questions
How many weys is 1 pennyweight?
How do I convert pennyweights to weys?
How do I convert weys back to pennyweights?
How many weys is 100 pennyweights?
Popular weight unit conversions
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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 = 1.360544e-5 wey) 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.