Mass and Weight · Unit Converter

Convert Momme to Ratti

Convert mommes to rattis instantly. 1 momme = 30.8641975309 ratti — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ratti to Momme 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

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.

Indian / South Asian

Ratti

What is a ratti?

The ratti equals about 0.1215 gram, the smallest traditional South Asian weight.

Origin of the ratti

Based on the seed of the Gunja plant (Abrus precatorius), or 'raktika' in Sanskrit.

Where it is used

Gemstones and gold in Indian and South Asian jewelry.

When and where it was developed

One of the oldest weight units of the Indian subcontinent, later standardized.

Momme to Ratti 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 rattis:

1 mom = 30.8641975309 ratti
1 ratti = 0.0324 mom

To convert mommes to rattis, multiply the value in mommes by 30.8641975309. To reverse, multiply rattis by 0.0324.

How to use this converter

Type a value into the calculator. The result in rattis updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ratti to Momme converter for the reverse direction.

Step-by-step: convert mommes to rattis

  1. Write down the value in mommes (mom).
  2. Multiply that value by the factor 30.8641975309.
  3. The product is the equivalent value in rattis (ratti).
  4. To reverse, multiply the ratti value by 0.0324.

Worked examples

Example 1 — Convert 1 mom to ratti:
1 × 30.8641975309 = 30.8641975309 ratti

Example 2 — Convert 100 mom to ratti:
100 × 30.8641975309 = 3086.4197530864 ratti

Real-world example — Adjacent metric sub-units

One momme equals 1,000 rattis. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.

1 mom × 30.8641975309 = 30.8641975309 ratti

Real-world example — Adjacent small-scale precision

One momme equals 1,000 rattis — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).

1 mom × 30.8641975309 = 30.8641975309 ratti

Momme to Ratti conversion table

Standard reference values for converting mommes to rattis:

Momme [mom]Ratti [ratti]
0.010.3086419753
0.13.0864197531
130.8641975309
261.7283950617
392.5925925926
4123.4567901235
5154.3209876543
10308.6419753086
20617.2839506173
30925.9259259259
401234.5679012346
501543.2098765432
1003086.4197530864
50015432.0987654321
100030864.1975308642

Frequently asked questions

How many rattis is 1 momme?
1 momme equals 30.8641975309 ratti.
How do I convert mommes to rattis?
Multiply the value in mommes by 30.8641975309 to get rattis.
How do I convert rattis back to mommes?
Multiply the value in rattis by 0.0324, or use the Ratti to Momme converter.
How many rattis is 100 mommes?
100 mommes equals 3086.4197530864 rattis, because 100 × 30.8641975309 = 3086.4197530864.

Convert Momme to other weight units

Show all Momme conversions
Metric / SI (18 units)
Momme to Attogram (ag) Momme to Femtogram (fg) Momme to Picogram (pg) Momme to Nanogram (ng) Momme to Microgram (µg) Momme to Milligram (mg) Momme to Centigram (cg) Momme to Decigram (dg) Momme to Gram (g) Momme to Dekagram (dag) Momme to Hectogram (hg) Momme to Kilogram (kg) Momme to Quintal (metric) (q) Momme to Metric Ton (t) Momme to Gigagram (Gg) Momme to Teragram (Tg) Momme to Petagram (Pg) Momme to Exagram (Eg)
Avoirdupois (15 units)
Momme to Grain (gr) Momme to Dram (avoirdupois) (dr) Momme to Ounce (oz) Momme to Pound (lb) Momme to Clove (clove) Momme to Stone (US) (st) Momme to Stone (UK) (st) Momme to Quarter (US) (qr) Momme to Quarter (UK) (qr) Momme to Hundredweight (US) (cwt) Momme to Hundredweight (UK) (cwt) Momme to Wey (wey) Momme to Kilopound (kip) (kip) Momme to Ton (short, US) (sh tn) Momme to Ton (long, UK) (long tn)
Troy & Apothecary (9 units)
Momme to Point (1/100 carat) (pt) Momme to Carat (metric) (ct) Momme to Scruple (apothecary) (s ap) Momme to Pennyweight (dwt) Momme to Mace (mace) Momme to Dram (apothecary/troy) (dr ap) Momme to Troy Ounce (oz t) Momme to Tael (tael) Momme to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Momme to Ratti (ratti) Momme to Masha (masha) Momme to Tola (tola) Momme to Chittack (Chatank) (chittack) Momme to Seer (Ser) (seer) Momme to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Momme to Electron Mass (rest) (me) Momme to MeV/c2 (MeV/c²) Momme to Muon Mass (mµ) Momme to Atomic Mass Unit (u) Momme to Proton Mass (mp) Momme to Neutron Mass (mn) Momme to Deuteron Mass (md) Momme to Carbon-12 Atom Mass (C-12) Momme to Planck Mass (mP)
Astronomical (4 units)
Momme to Lunar Mass (Moon) (M☾) Momme to Earth's Mass (M⊕) Momme to Jupiter Mass (MJ) Momme to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Momme to Lepton (Biblical Roman) (lepton) Momme to Quadrans (Biblical Roman) (quadrans) Momme to Assarion (Biblical Roman) (assarion) Momme to Gerah (Biblical Hebrew) (gerah) Momme to Drachma (Biblical Greek) (drachma) Momme to Denarius (Biblical Roman) (denarius) Momme to Bekan (Biblical Hebrew) (bekah) Momme to Didrachma (Biblical Greek) (didrachma) Momme to Shekel (Biblical Hebrew) (shekel) Momme to Tetradrachma (Biblical Greek) (tetra) Momme to Mina (Biblical Greek) (mina) Momme to Mina (Biblical Hebrew) (mina) Momme to Talent (Biblical Greek) (talent) Momme to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Momme to Poundal (pdl) Momme to Ton (assay) (US) (AT) Momme to Ton (assay) (UK) (AT) Momme to Kilogram-force square second/meter (hyl) Momme to Slug (slug)

Sources & references

Conversion factor (1 mom = 30.8641975309 ratti) verified against the following authoritative sources:

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