Convert Pennyweight to Momme
Convert pennyweights to mommes instantly. 1 pennyweight = 0.4147130133 momme — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Momme 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.
Momme
The momme (mom) equals 3.75 grams.
A traditional Japanese mass unit (Japanese 'monme').
Pearls, and as the standard weight grade for silk fabric.
Part of the traditional Japanese shakkanho system.
Pennyweight to Momme 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 mommes:
To convert pennyweights to mommes, multiply the value in pennyweights by 0.4147130133. To reverse, multiply mommes by 2.4113060547.
How to use this converter
Type a value into the calculator. The result in mommes updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Momme to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to mommes
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 0.4147130133.
- The product is the equivalent value in mommes (mom).
- To reverse, multiply the momme value by 2.4113060547.
Worked examples
Example 1 — Convert 1 dwt to mom:
1 × 0.4147130133 = 0.4147130133 mom
Example 2 — Convert 100 dwt to mom:
100 × 0.4147130133 = 41.4713013333 mom
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to mommes — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 0.4147130133 = 12.4413904 mom
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 mommes daily when mixing metric and imperial tools.
10 dwt × 0.4147130133 = 4.1471301333 mom
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to mommes is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 0.4147130133 = 2.0735650667 mom
Pennyweight to Momme conversion table
Standard reference values for converting pennyweights to mommes:
| Pennyweight [dwt] | Momme [mom] |
|---|---|
| 0.01 | 0.0041471301 |
| 0.1 | 0.0414713013 |
| 1 | 0.4147130133 |
| 2 | 0.8294260267 |
| 3 | 1.24413904 |
| 4 | 1.6588520533 |
| 5 | 2.0735650667 |
| 10 | 4.1471301333 |
| 20 | 8.2942602667 |
| 30 | 12.4413904 |
| 40 | 16.5885205333 |
| 50 | 20.7356506667 |
| 100 | 41.4713013333 |
| 500 | 207.3565066667 |
| 1000 | 414.7130133333 |
Frequently asked questions
How many mommes is 1 pennyweight?
How do I convert pennyweights to mommes?
How do I convert mommes back to pennyweights?
How many mommes 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 = 0.4147130133 mom) 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.