MasterTool

Grams to Moles Converter

Calculate grams to moles instantly in your browser — the published formula, worked locally with no data sent anywhere.

IUPAC atomic weights last updated · reference source

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Dated static reference; no live data is fetched. Verify current source values and assumptions before relying on results.

What this tool does

Calculate grams to moles instantly in your browser — the published formula, worked locally with no data sent anywhere. One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).

How to use the Grams to Moles Converter

  1. Enter or select chemical formula.
  2. Enter or select convert.
  3. Enter or select amount (grams, or moles in the reverse direction).
  4. Read the calculated result; change any measurement to compare alternatives.

Formula

moles = grams ÷ molar mass, where the molar mass is computed from the formula with IUPAC atomic weights — the same engine as the molar mass calculator.
formula
Chemical formula
dir
Convert
amount
Amount (grams, or moles in the reverse direction)

One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).

Worked example

For grams to moles converter, the following measurements illustrate the exact method: Chemical formula: H2O; Convert: g2m; Amount (grams, or moles in the reverse direction): 36.03.

Inputs

  • Chemical formulaH2O
  • ConvertGrams → moles
  • Amount (grams, or moles in the reverse direction)36.03

Result

  • Amount (mol)2
  • Molar mass used (g/mol)18.02
  • Millimoles (mmol)2,000
  • Molecules / formula units1,204,428,152,000,000,000,000,000

Results explained

Amount (mol)
Amount (mol) from the formula above. One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).
Molar mass used (g/mol)
Molar mass used (g/mol) from the formula above. One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).
Millimoles (mmol)
Millimoles (mmol) from the formula above. One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).
Molecules / formula units
Molecules / formula units from the formula above. One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).

Frequently asked questions

moles = grams ÷ molar mass, where the molar mass is computed from the formula with IUPAC atomic weights — the same engine as the molar mass calculator.

One mole is exactly 6.02214076×10²³ particles (the Avogadro constant, exact since the 2019 SI revision). The formula must be the actual species weighed — hydrates include their water (CuSO4·5H2O, not CuSO4).

Every field is labelled with its unit — enter values in exactly the labelled unit and read the result in the labelled output unit. Fields with a unit symbol also support the site-wide imperial/metric switch, which converts before the formula runs.

It uses double-precision arithmetic and the published constants and formulas named on this page. The last displayed digit may be rounded, and real conditions can differ from the idealized model described in the assumptions.

Yes. Every calculation runs entirely in your browser; nothing you enter is uploaded, stored or shared.