Convert Momme to Wey
Convert mommes to weys instantly. 1 momme = 3.280688e-5 wey — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Wey to Momme converter for the reverse conversion.
Units explained
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.
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.
Momme 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 mommes and weys:
To convert mommes to weys, multiply the value in mommes by 3.280688e-5. To reverse, multiply weys by 30481.407264.
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 Momme converter for the reverse direction.
Step-by-step: convert mommes to weys
- Write down the value in mommes (mom).
- Multiply that value by the factor 3.280688e-5.
- The product is the equivalent value in weys (wey).
- To reverse, multiply the wey value by 30481.407264.
Worked examples
Example 1 — Convert 1 mom to wey:
1 × 3.280688e-5 = 3.280688e-5 wey
Example 2 — Convert 100 mom to wey:
100 × 3.280688e-5 = 0.0032806884 wey
Real-world example — Ruler-scale measurements
A 30-momme school ruler converts cleanly to weys — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 mom × 3.280688e-5 = 0.0009842065 wey
Real-world example — Hardware-scale dimensions
A 10-momme fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between mommes and weys daily when mixing metric and imperial tools.
10 mom × 3.280688e-5 = 0.0003280688 wey
Real-world example — Postcard and small-object dimensions
A postcard is about 5 mommes wide. Converting to weys is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 mom × 3.280688e-5 = 0.0001640344 wey
Momme to Wey conversion table
Standard reference values for converting mommes to weys:
| Momme [mom] | Wey [wey] |
|---|---|
| 0.01 | 3.280688e-7 |
| 0.1 | 3.280688e-6 |
| 1 | 3.280688e-5 |
| 2 | 6.561377e-5 |
| 3 | 9.842065e-5 |
| 4 | 0.0001312275 |
| 5 | 0.0001640344 |
| 10 | 0.0003280688 |
| 20 | 0.0006561377 |
| 30 | 0.0009842065 |
| 40 | 0.0013122754 |
| 50 | 0.0016403442 |
| 100 | 0.0032806884 |
| 500 | 0.0164034421 |
| 1000 | 0.0328068843 |
Frequently asked questions
How many weys is 1 momme?
How do I convert mommes to weys?
How do I convert weys back to mommes?
How many weys is 100 mommes?
Popular weight unit conversions
Convert Momme to other weight units
Show all Momme 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 mom = 3.280688e-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.