Moles to grams calculator

Convert moles to grams: mass = amount in moles × molar mass. Type a formula such as NaCl and the molar mass fills in.

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English

Amount (mol)

Molar mass (g/mol)

Substance formula

Optional: type a formula such as NaCl or C6H12O6 and the molar mass fills in.

Answer

…

More results

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

Step-by-step calculation

Each step uses the numbers you entered. Steps show 12 significant digits; the answer uses full precision.

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Rounding and decimal places

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Automatic precision rounds answers for reading: up to six significant digits, with whole numbers kept in full. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Quick calculator

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How it works

Multiply the amount in moles by the molar mass in grams per mole: 0.5 mol × 58.44 g/mol = 29.22 g.

Type the formula and the molar mass is added up from CIAAW standard atomic weights, or enter a known molar mass. For a mixture, an isotope-specific sample or an impure reagent, enter the molar mass that fits your sample.

Next: Grams to moles calculator

Next: Molarity calculator

Worked example

0.5 mol of table salt (NaCl, 58.44 g/mol) is 29.22 g: 0.5 × 58.44 = 29.22.

How the mass changes with amount

Other inputs keep their starting values: Molar mass (g/mol): 58.44. Examples only, not recommendations.

Amount (mol)	Mass (g)
0.25	14.61
0.5	29.22
1	58.44

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ToolOctopus. “Moles to grams calculator.” Updated 2026-10-11. https://tooloctopus.com/moles-to-grams-calculator.

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