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Grams to moles calculator

Convert grams to moles with amount = mass ÷ molar mass.

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Convert grams to moles with amount = mass ÷ molar mass.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Step-by-step calculation
Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.
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    Save the current answer, then change an input to compare. This clears when you leave.
    Formula and assumptions
    Supply the molar mass for your exact substance and composition. No periodic table, isotope mixture or purity correction is assumed.
    Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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    Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.
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    Updated 
    Using Grams to moles calculator
    Convert grams to moles with amount = mass ÷ molar mass.
    Supply the molar mass for your exact substance and composition. No periodic table, isotope mixture or purity correction is assumed.
    Next: Molarity calculator
    A worked example
    Example inputs: mass (g) = 18, molar mass (g/mol) = 18. Amount (mol) = 1.
    Before you use the result
    Supply the molar mass for your exact substance and composition. No periodic table, isotope mixture or purity correction is assumed.
    Example results for mass (g)
    These examples use Molar mass (g/mol): 18. They are reference calculations, not recommended settings.
    Mass (g)Amount (mol)
    90.5
    181
    362
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    ToolOctopus. “Grams to moles calculator.” Updated 2026-09-26. https://tooloctopus.com/grams-to-moles-calculator.
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