Mass and Weight · Unit Converter

Convert Gram to Carbon-12 Atom Mass

Convert grams to carbon-12 atom mass instantly. 1 gram = 5.018451e+22 carbon-12 atom mass — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Carbon-12 Atom Mass to Gram 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

Gram

What is a gram?

The gram (g) equals one-thousandth of a kilogram.

Origin of the gram

From Late Latin 'gramma', a small weight or scruple.

Where it is used

The everyday metric unit for food, medicine, and small objects.

When and where it was developed

Defined in 1795 as the mass of one cubic centimeter of water at melting point.

Scientific / Atomic

Carbon-12 Atom Mass

What is a carbon-12 atom mass?

The mass of a single carbon-12 atom is exactly 12 u by definition, about 1.9926E-26 kg.

Origin of the carbon-12 atom mass

The reference nuclide that defines the unified atomic mass scale.

Where it is used

The defining standard for the atomic mass unit.

When and where it was developed

Chosen as the mass standard by IUPAC and IUPAP in 1960-1961.

Gram to Carbon-12 Atom Mass conversion formula

The relationship between grams and carbon-12 atom mass:

1 g = 5.018451e+22 C-12
1 C-12 = 1.992647e-23 g

To convert grams to carbon-12 atom mass, multiply the value in grams by 5.018451e+22. To reverse, multiply carbon-12 atom mass by 1.992647e-23.

How to use this converter

Type a value into the calculator. The result in carbon-12 atom mass updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Carbon-12 Atom Mass to Gram converter for the reverse direction.

Step-by-step: convert grams to carbon-12 atom mass

  1. Write down the value in grams (g).
  2. Multiply that value by the factor 5.018451e+22.
  3. The product is the equivalent value in carbon-12 atom mass (C-12).
  4. To reverse, multiply the carbon-12 atom mass value by 1.992647e-23.

Worked examples

Example 1 — Convert 1 g to C-12:
1 × 5.018451e+22 = 5.018451e+22 C-12

Example 2 — Convert 100 g to C-12:
100 × 5.018451e+22 = 5.018451e+24 C-12

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

One gram equals 10 million carbon-12 atom mass — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 g × 5.018451e+22 = 5.018451e+22 C-12

Real-world example — Centimeter to wavelength scale

One gram equals 10 million carbon-12 atom mass. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.

1 g × 5.018451e+22 = 5.018451e+22 C-12

Gram to Carbon-12 Atom Mass conversion table

Standard reference values for converting grams to carbon-12 atom mass:

Gram [g]Carbon-12 Atom Mass [C-12]
0.015.018451e+20
0.15.018451e+21
15.018451e+22
21.00369e+23
31.505535e+23
42.00738e+23
52.509225e+23
105.018451e+23
201.00369e+24
301.505535e+24
402.00738e+24
502.509225e+24
1005.018451e+24
5002.509225e+25
10005.018451e+25

Frequently asked questions

How many carbon-12 atom mass is 1 gram?
1 gram equals 5.018451e+22 carbon-12 atom mass.
How do I convert grams to carbon-12 atom mass?
Multiply the value in grams by 5.018451e+22 to get carbon-12 atom mass.
How do I convert carbon-12 atom mass back to grams?
Multiply the value in carbon-12 atom mass by 1.992647e-23, or use the Carbon-12 Atom Mass to Gram converter.
How many carbon-12 atom mass is 100 grams?
100 grams equals 5.018451e+24 carbon-12 atom mass, because 100 × 5.018451e+22 = 5.018451e+24.

Convert Gram to other weight units

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

Sources & references

Conversion factor (1 g = 5.018451e+22 C-12) verified against the following authoritative sources:

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