Convert Momme to Attogram
Convert mommes to attograms instantly. 1 momme = 3.75e+18 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram 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.
Attogram
An attogram (ag) equals 10^-21 kilogram.
From the SI prefix 'atto-' (from Danish 'atten', eighteen).
Frontier nanoscience and single-molecule mass detection.
The atto- prefix was adopted by the CGPM in 1975.
Momme to Attogram 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 attograms:
To convert mommes to attograms, multiply the value in mommes by 3.75e+18. To reverse, multiply attograms by 2.666667e-19.
How to use this converter
Type a value into the calculator. The result in attograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Attogram to Momme converter for the reverse direction.
Step-by-step: convert mommes to attograms
- Write down the value in mommes (mom).
- Multiply that value by the factor 3.75e+18.
- The product is the equivalent value in attograms (ag).
- To reverse, multiply the attogram value by 2.666667e-19.
Worked examples
Example 1 — Convert 1 mom to ag:
1 × 3.75e+18 = 3.75e+18 ag
Example 2 — Convert 100 mom to ag:
100 × 3.75e+18 = 3.75e+20 ag
Real-world example — Small-scale to atomic-scale
One momme equals 10 million attograms — useful for physics curricula that relate everyday measurements to atomic and optical scales.
1 mom × 3.75e+18 = 3.75e+18 ag
Real-world example — Centimeter to wavelength scale
One momme equals 10 million attograms. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.
1 mom × 3.75e+18 = 3.75e+18 ag
Momme to Attogram conversion table
Standard reference values for converting mommes to attograms:
| Momme [mom] | Attogram [ag] |
|---|---|
| 0.01 | 3.75e+16 |
| 0.1 | 3.75e+17 |
| 1 | 3.75e+18 |
| 2 | 7.5e+18 |
| 3 | 1.125e+19 |
| 4 | 1.5e+19 |
| 5 | 1.875e+19 |
| 10 | 3.75e+19 |
| 20 | 7.5e+19 |
| 30 | 1.125e+20 |
| 40 | 1.5e+20 |
| 50 | 1.875e+20 |
| 100 | 3.75e+20 |
| 500 | 1.875e+21 |
| 1000 | 3.75e+21 |
Frequently asked questions
How many attograms is 1 momme?
How do I convert mommes to attograms?
How do I convert attograms back to mommes?
How many attograms is 100 mommes?
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 mom = 3.75e+18 ag) 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.