Mass and Weight · Unit Converter

Convert Attogram to Momme

Convert attograms to mommes instantly. 1 attogram = 2.666667e-19 momme — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Momme to Attogram converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.
Mass and Weight category 2 min read Published Last reviewed Updated

Units explained

Metric / SI

Attogram

What is a attogram?

An attogram (ag) equals 10^-21 kilogram.

Origin of the attogram

From the SI prefix 'atto-' (from Danish 'atten', eighteen).

Where it is used

Frontier nanoscience and single-molecule mass detection.

When and where it was developed

The atto- prefix was adopted by the CGPM in 1975.

Troy & Apothecary

Momme

What is a momme?

The momme (mom) equals 3.75 grams.

Origin of the momme

A traditional Japanese mass unit (Japanese 'monme').

Where it is used

Pearls, and as the standard weight grade for silk fabric.

When and where it was developed

Part of the traditional Japanese shakkanho system.

Attogram 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 attograms and mommes:

1 ag = 2.666667e-19 mom
1 mom = 3.75e+18 ag

To convert attograms to mommes, multiply the value in attograms by 2.666667e-19. To reverse, multiply mommes by 3.75e+18.

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 Attogram converter for the reverse direction.

Step-by-step: convert attograms to mommes

  1. Write down the value in attograms (ag).
  2. Multiply that value by the factor 2.666667e-19.
  3. The product is the equivalent value in mommes (mom).
  4. To reverse, multiply the momme value by 3.75e+18.

Worked examples

Example 1 — Convert 1 ag to mom:
1 × 2.666667e-19 = 2.666667e-19 mom

Example 2 — Convert 100 ag to mom:
100 × 2.666667e-19 = 2.666667e-17 mom

Real-world example — Sub-micron to millimeter

500,000 attograms converts to a small everyday quantity in mommes — useful when relating optical-wavelength specifications to physical mounting hardware.

500000 ag × 2.666667e-19 = 1.333333e-13 mom

Real-world example — From wavelengths to millimeter-scale objects

A value of one million attograms sounds vast at the atomic scale but converts to a small everyday quantity in mommes — useful when relating optical-wavelength specifications to physical mounting hardware.

1000000 ag × 2.666667e-19 = 2.666667e-13 mom

Attogram to Momme conversion table

Standard reference values for converting attograms to mommes:

Attogram [ag]Momme [mom]
0.012.666667e-21
0.12.666667e-20
12.666667e-19
25.333333e-19
38e-19
41.066667e-18
51.333333e-18
102.666667e-18
205.333333e-18
308e-18
401.066667e-17
501.333333e-17
1002.666667e-17
5001.333333e-16
10002.666667e-16

Frequently asked questions

How many mommes is 1 attogram?
1 attogram equals 2.666667e-19 momme.
How do I convert attograms to mommes?
Multiply the value in attograms by 2.666667e-19 to get mommes.
How do I convert mommes back to attograms?
Multiply the value in mommes by 3.75e+18, or use the Momme to Attogram converter.
How many mommes is 100 attograms?
100 attograms equals 2.666667e-17 mommes, because 100 × 2.666667e-19 = 2.666667e-17.

Convert Attogram to other weight units

Show all Attogram conversions
Metric / SI (17 units)
Attogram to Femtogram (fg) Attogram to Picogram (pg) Attogram to Nanogram (ng) Attogram to Microgram (µg) Attogram to Milligram (mg) Attogram to Centigram (cg) Attogram to Decigram (dg) Attogram to Gram (g) Attogram to Dekagram (dag) Attogram to Hectogram (hg) Attogram to Kilogram (kg) Attogram to Quintal (metric) (q) Attogram to Metric Ton (t) Attogram to Gigagram (Gg) Attogram to Teragram (Tg) Attogram to Petagram (Pg) Attogram to Exagram (Eg)
Avoirdupois (15 units)
Attogram to Grain (gr) Attogram to Dram (avoirdupois) (dr) Attogram to Ounce (oz) Attogram to Pound (lb) Attogram to Clove (clove) Attogram to Stone (US) (st) Attogram to Stone (UK) (st) Attogram to Quarter (US) (qr) Attogram to Quarter (UK) (qr) Attogram to Hundredweight (US) (cwt) Attogram to Hundredweight (UK) (cwt) Attogram to Wey (wey) Attogram to Kilopound (kip) (kip) Attogram to Ton (short, US) (sh tn) Attogram to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Attogram to Point (1/100 carat) (pt) Attogram to Carat (metric) (ct) Attogram to Scruple (apothecary) (s ap) Attogram to Pennyweight (dwt) Attogram to Momme (mom) Attogram to Mace (mace) Attogram to Dram (apothecary/troy) (dr ap) Attogram to Troy Ounce (oz t) Attogram to Tael (tael) Attogram to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Attogram to Ratti (ratti) Attogram to Masha (masha) Attogram to Tola (tola) Attogram to Chittack (Chatank) (chittack) Attogram to Seer (Ser) (seer) Attogram to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Attogram to Electron Mass (rest) (me) Attogram to MeV/c2 (MeV/c²) Attogram to Muon Mass (mµ) Attogram to Atomic Mass Unit (u) Attogram to Proton Mass (mp) Attogram to Neutron Mass (mn) Attogram to Deuteron Mass (md) Attogram to Carbon-12 Atom Mass (C-12) Attogram to Planck Mass (mP)
Astronomical (4 units)
Attogram to Lunar Mass (Moon) (M☾) Attogram to Earth's Mass (M⊕) Attogram to Jupiter Mass (MJ) Attogram to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Attogram to Lepton (Biblical Roman) (lepton) Attogram to Quadrans (Biblical Roman) (quadrans) Attogram to Assarion (Biblical Roman) (assarion) Attogram to Gerah (Biblical Hebrew) (gerah) Attogram to Drachma (Biblical Greek) (drachma) Attogram to Denarius (Biblical Roman) (denarius) Attogram to Bekan (Biblical Hebrew) (bekah) Attogram to Didrachma (Biblical Greek) (didrachma) Attogram to Shekel (Biblical Hebrew) (shekel) Attogram to Tetradrachma (Biblical Greek) (tetra) Attogram to Mina (Biblical Greek) (mina) Attogram to Mina (Biblical Hebrew) (mina) Attogram to Talent (Biblical Greek) (talent) Attogram to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Attogram to Poundal (pdl) Attogram to Ton (assay) (US) (AT) Attogram to Ton (assay) (UK) (AT) Attogram to Kilogram-force square second/meter (hyl) Attogram to Slug (slug)

Sources & references

Conversion factor (1 ag = 2.666667e-19 mom) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.