Mass and Weight · Unit Converter

Convert Chittack (Chatank) to Electron Mass (rest)

Convert chittacks (chatank) to electron mass (rest) instantly. 1 chittack (chatank) = 6.402078e+28 electron mass (rest) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Electron Mass (rest) to Chittack (Chatank) 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 June 10, 2026 Last reviewed June 10, 2026 Updated June 10, 2026

Units explained

Indian / South Asian

Chittack (Chatank)

What is a chittack (chatank)?

The chittack (chatank) equals one-sixteenth of a seer, about 58.3 grams.

Origin of the chittack (chatank)

A traditional South Asian unit in the seer-based system.

Where it is used

Historical grocery and provisions weighing in India and Bangladesh.

When and where it was developed

Part of the pre-metric South Asian weight system.

Scientific / Atomic

Electron Mass (rest)

What is a electron mass (rest)?

The electron rest mass is about 9.109E-31 kg.

Origin of the electron mass (rest)

The mass of the electron, the lightest charged elementary particle.

Where it is used

Atomic and particle physics.

When and where it was developed

Quantified after J. J. Thomson identified the electron in 1897.

Chittack (Chatank) to Electron Mass (rest) 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 chittacks (chatank) and electron mass (rest):

1 chittack = 6.402078e+28 me

1 me = 1.561993e-29 chittack

To convert chittacks (chatank) to electron mass (rest), multiply the value in chittacks (chatank) by 6.402078e+28. To reverse, multiply electron mass (rest) by 1.561993e-29.

How to use this converter

Type a value into the calculator. The result in electron mass (rest) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Electron Mass (rest) to Chittack (Chatank) converter for the reverse direction.

Step-by-step: convert chittacks (chatank) to electron mass (rest)

Write down the value in chittacks (chatank) (chittack).
Multiply that value by the factor 6.402078e+28.
The product is the equivalent value in electron mass (rest) (me).
To reverse, multiply the electron mass (rest) value by 1.561993e-29.

Worked examples

Example 1 — Convert 1 chittack to me:
1 × 6.402078e+28 = 6.402078e+28 me

Example 2 — Convert 100 chittack to me:
100 × 6.402078e+28 = 6.402078e+30 me

Real-world example — Small-scale to atomic-scale

One chittack (chatank) equals 10 million electron mass (rest) — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 chittack × 6.402078e+28 = 6.402078e+28 me

Real-world example — Centimeter to wavelength scale

One chittack (chatank) equals 10 million electron mass (rest). Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.

1 chittack × 6.402078e+28 = 6.402078e+28 me

Chittack (Chatank) to Electron Mass (rest) conversion table

Standard reference values for converting chittacks (chatank) to electron mass (rest):

Chittack (Chatank) [chittack]	Electron Mass (rest) [me]
0.01	6.402078e+26
0.1	6.402078e+27
1	6.402078e+28
2	1.280416e+29
3	1.920623e+29
4	2.560831e+29
5	3.201039e+29
10	6.402078e+29
20	1.280416e+30
30	1.920623e+30
40	2.560831e+30
50	3.201039e+30
100	6.402078e+30
500	3.201039e+31
1000	6.402078e+31

Frequently asked questions

How many electron mass (rest) is 1 chittack (chatank)?

1 chittack (chatank) equals 6.402078e+28 electron mass (rest).

How do I convert chittacks (chatank) to electron mass (rest)?

Multiply the value in chittacks (chatank) by 6.402078e+28 to get electron mass (rest).

How do I convert electron mass (rest) back to chittacks (chatank)?

Multiply the value in electron mass (rest) by 1.561993e-29, or use the Electron Mass (rest) to Chittack (Chatank) converter.

How many electron mass (rest) is 100 chittacks (chatank)?

100 chittacks (chatank) equals 6.402078e+30 electron mass (rest), because 100 × 6.402078e+28 = 6.402078e+30.

Convert Chittack (Chatank) to other weight units

Show all Chittack (Chatank) conversions

Metric / SI (18 units)

Avoirdupois (15 units)

Troy & Apothecary (10 units)

Chittack (Chatank) to Point (1/100 carat) (pt) Chittack (Chatank) to Carat (metric) (ct) Chittack (Chatank) to Scruple (apothecary) (s ap) Chittack (Chatank) to Pennyweight (dwt) Chittack (Chatank) to Momme (mom) Chittack (Chatank) to Mace (mace) Chittack (Chatank) to Dram (apothecary/troy) (dr ap) Chittack (Chatank) to Troy Ounce (oz t) Chittack (Chatank) to Tael (tael) Chittack (Chatank) to Pound (troy/apothecary) (lb t)

Indian / South Asian (5 units)

Chittack (Chatank) to Ratti (ratti) Chittack (Chatank) to Masha (masha) Chittack (Chatank) to Tola (tola) Chittack (Chatank) to Seer (Ser) (seer) Chittack (Chatank) to Maund (Mann) (maund)

Scientific / Atomic (9 units)

Chittack (Chatank) to Electron Mass (rest) (me) Chittack (Chatank) to MeV/c2 (MeV/c²) Chittack (Chatank) to Muon Mass (mµ) Chittack (Chatank) to Atomic Mass Unit (u) Chittack (Chatank) to Proton Mass (mp) Chittack (Chatank) to Neutron Mass (mn) Chittack (Chatank) to Deuteron Mass (md) Chittack (Chatank) to Carbon-12 Atom Mass (C-12) Chittack (Chatank) to Planck Mass (mP)

Astronomical (4 units)

Chittack (Chatank) to Lunar Mass (Moon) (M☾) Chittack (Chatank) to Earth's Mass (M⊕) Chittack (Chatank) to Jupiter Mass (MJ) Chittack (Chatank) to Sun's Mass (M☉)

Biblical / Ancient (14 units)

Force / Engineering (5 units)

Chittack (Chatank) to Poundal (pdl) Chittack (Chatank) to Ton (assay) (US) (AT) Chittack (Chatank) to Ton (assay) (UK) (AT) Chittack (Chatank) to Kilogram-force square second/meter (hyl) Chittack (Chatank) to Slug (slug)

Sources & references

Conversion factor (1 chittack = 6.402078e+28 me) 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.

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