Grams to Moles Calculator
Convert between grams, moles and number of particles for any chemical formula or molar mass, using IUPAC atomic weights and the exact Avogadro constant.
Result
Amount, mol: 0.377663
Exact conversions for a pure substance, using standard atomic weights for normal terrestrial material.
- Mass
- 28.35 g (1.000017 oz)
- Number of particles
- 2.274337466 × 10^23
- Molar mass, g/mol
- 75.067
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Results come from the published equations applied to the values you enter. They are not electrical design, conductor sizing, laboratory safety or medical guidance. Weather indices describe a standard person in standard conditions and are not a forecast. Where codes apply, local rules vary and must be checked. Read the full disclaimer
How to use the Grams to Moles Calculator
- Choose the conversion, such as grams to moles or moles to molecules.
- Type the chemical formula, such as H2O or C6H12O6, or switch to entering a molar mass you already know.
- Enter the mass, the moles or the particle count, and read the answer with the molar mass it used.
The formulas
moles = mass in grams ÷ molar massmass in grams = moles × molar massparticles = moles × 6.02214076 × 10^23moles = particles ÷ 6.02214076 × 10^23The molar mass is the sum of the standard atomic weights of every atom in the formula, in grams per mole.
Reading the formula
Symbols are case-sensitive and start with a capital letter: CO is carbon monoxide, Co is cobalt. A number after a symbol or a bracket multiplies it, so Ca(OH)2 has two oxygen and two hydrogen atoms, and a dot separates the parts of a hydrate, as in CuSO4·5H2O. Elements with no stable isotope, such as technetium, have no standard atomic weight and are refused; enter their molar mass directly.
What the diagram shows
Grams, moles and particles as three boxes. The molar mass converts between the first two and the Avogadro constant between the last two; the boxes you converted from and to are highlighted.
With your numbers
- Mass = moles × molar mass: 28.35 g = 0.377663 mol × 75.067 g/mol
Quick reference
Exact conversions for a pure substance, using standard atomic weights for normal terrestrial material.
| Example | Result |
|---|---|
| 28.35 g of glycine, C2H5O2N | Amount, mol: 0.377663 |
| 4.7 g of potassium, K | Amount, mol: 0.12021 |
| 5 g of copper to atoms | Number of particles: 4.738410569 × 10^22 |
| 0.000142 mol of vitamin C to grams | Mass: 0.02501 g |
| 1.2044 × 10^24 water molecules to grams | Mass: 36.029158 g |
| 10 g at 58.44 g/mol | Amount, mol: 0.171116 |
| One mole to particles | Number of particles: 6.02214076 × 10^23 |
Where the numbers come from
The fixed figures this calculator relies on, and the published source each one was checked against. How the calculators are built and checked
16 sources
BIPM, SI defining constants, SI Brochure (2019), https://www.bipm.org/en/measurement-units/si-defining-constants: "6.022 140 76 x 10^23 mol-1".
Used for
- The Avogadro constant: entities per mole, exact since the 2019 SI.
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [1.00784, 1.00811].
Used for
- Conventional atomic weight of hydrogen; IUPAC publishes the interval [1.00784, 1.00811].
CIAAW, Standard Atomic Weights 2024 (https://www.ciaaw.org/atomic-weights.htm), the table of Prohaska et al., "Standard atomic weights of the elements 2021 (IUPAC Technical Report)", Pure Appl. Chem. 94(5) 573-600 (2022), Table 1, with the 2024 revisions of Gd, Lu and Zr.
Used for
- Standard atomic weight of helium.
- Standard atomic weight of beryllium.
- Standard atomic weight of fluorine.
- Standard atomic weight of neon.
- Standard atomic weight of sodium.
- Standard atomic weight of aluminium.
- Standard atomic weight of phosphorus.
- Standard atomic weight of potassium.
- Standard atomic weight of calcium.
- Standard atomic weight of scandium.
- Standard atomic weight of titanium.
- Standard atomic weight of vanadium.
- Standard atomic weight of chromium.
- Standard atomic weight of manganese.
- Standard atomic weight of iron.
- Standard atomic weight of cobalt.
- Standard atomic weight of nickel.
- Standard atomic weight of copper.
- Standard atomic weight of zinc.
- Standard atomic weight of gallium.
- Standard atomic weight of germanium.
- Standard atomic weight of arsenic.
- Standard atomic weight of selenium.
- Standard atomic weight of krypton.
- Standard atomic weight of rubidium.
- Standard atomic weight of strontium.
- Standard atomic weight of yttrium.
- Standard atomic weight of zirconium.
- Standard atomic weight of niobium.
- Standard atomic weight of molybdenum.
- Standard atomic weight of ruthenium.
- Standard atomic weight of rhodium.
- Standard atomic weight of palladium.
- Standard atomic weight of silver.
- Standard atomic weight of cadmium.
- Standard atomic weight of indium.
- Standard atomic weight of tin.
- Standard atomic weight of antimony.
- Standard atomic weight of tellurium.
- Standard atomic weight of iodine.
- Standard atomic weight of xenon.
- Standard atomic weight of caesium.
- Standard atomic weight of barium.
- Standard atomic weight of lanthanum.
- Standard atomic weight of cerium.
- Standard atomic weight of praseodymium.
- Standard atomic weight of neodymium.
- Standard atomic weight of samarium.
- Standard atomic weight of europium.
- Standard atomic weight of gadolinium.
- Standard atomic weight of terbium.
- Standard atomic weight of dysprosium.
- Standard atomic weight of holmium.
- Standard atomic weight of erbium.
- Standard atomic weight of thulium.
- Standard atomic weight of ytterbium.
- Standard atomic weight of lutetium.
- Standard atomic weight of hafnium.
- Standard atomic weight of tantalum.
- Standard atomic weight of tungsten.
- Standard atomic weight of rhenium.
- Standard atomic weight of osmium.
- Standard atomic weight of iridium.
- Standard atomic weight of platinum.
- Standard atomic weight of gold.
- Standard atomic weight of mercury.
- Standard atomic weight of bismuth.
- Standard atomic weight of thorium.
- Standard atomic weight of protactinium.
- Standard atomic weight of uranium.
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [6.938, 6.997].
Used for
- Conventional atomic weight of lithium; IUPAC publishes the interval [6.938, 6.997].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [10.806, 10.821].
Used for
- Conventional atomic weight of boron; IUPAC publishes the interval [10.806, 10.821].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [12.0096, 12.0116].
Used for
- Conventional atomic weight of carbon; IUPAC publishes the interval [12.0096, 12.0116].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [14.00643, 14.00728].
Used for
- Conventional atomic weight of nitrogen; IUPAC publishes the interval [14.00643, 14.00728].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [15.99903, 15.99977].
Used for
- Conventional atomic weight of oxygen; IUPAC publishes the interval [15.99903, 15.99977].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [24.304, 24.307].
Used for
- Conventional atomic weight of magnesium; IUPAC publishes the interval [24.304, 24.307].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [28.084, 28.086].
Used for
- Conventional atomic weight of silicon; IUPAC publishes the interval [28.084, 28.086].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [32.059, 32.076].
Used for
- Conventional atomic weight of sulfur; IUPAC publishes the interval [32.059, 32.076].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [35.446, 35.457].
Used for
- Conventional atomic weight of chlorine; IUPAC publishes the interval [35.446, 35.457].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [39.792, 39.963].
Used for
- Conventional atomic weight of argon; IUPAC publishes the interval [39.792, 39.963].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [79.901, 79.907].
Used for
- Conventional atomic weight of bromine; IUPAC publishes the interval [79.901, 79.907].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [204.382, 204.385].
Used for
- Conventional atomic weight of thallium; IUPAC publishes the interval [204.382, 204.385].
CIAAW, Abridged Standard Atomic Weights 2024 (https://www.ciaaw.org/abridged-atomic-weights.htm): the abridged value that replaces the conventional atomic weight for an interval element, per Prohaska et al., Pure Appl. Chem. 94(5) 573-600 (2022), Table 1 column 7. The standard atomic weight is the interval [206.14, 207.94].
Used for
- Conventional atomic weight of lead; IUPAC publishes the interval [206.14, 207.94].
Common questions about the Grams to Moles Calculator
- How do I convert grams to moles?
- Divide the mass in grams by the molar mass in grams per mole. Glycine, C2H5O2N, has a molar mass of 75.067 g/mol, so 28.35 g of it is 28.35 ÷ 75.067 = 0.3777 mol. To go back, multiply moles by the molar mass.
- How do I get the number of atoms or molecules?
- Multiply the moles by the Avogadro constant, 6.02214076 × 10^23 per mole. Since 2019 that number is exact: it defines the mole. 5 g of copper is 0.07868 mol, which is 4.738 × 10^22 atoms.
- Atoms or molecules?
- Whatever the formula counts. For Cu the particles are atoms; for H2O they are molecules, each with three atoms; for NaCl they are formula units, each with one sodium and one chloride ion. To count the atoms of one element in a compound, multiply by how many the formula has: one mole of H2O holds two moles of hydrogen atoms.
- How do I type a very large number of particles?
- In scientific notation, as 6.022e23, 6.022 × 10^23 or 6.022x10^23, or as plain digits. The result is printed the same way, to ten significant figures.
- Where do the atomic weights come from?
- From the IUPAC Commission on Isotopic Abundances and Atomic Weights, the same table the molar mass calculator uses, so a formula gives the same molar mass on both pages. Textbooks often round them, so answers can differ from a worked example in the third or fourth significant figure.