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Molar Mass Converter processes your data locally in your browser. Nothing is sent to or stored on our servers.

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Open the tool, enter or paste your input, and your result appears instantly. Use the copy button to save it. The whole process takes under a minute.

Molar mass Converter

Convert molar mass units like g/mol, kg/mol.

Convert Units

From:

To:

Result:

Convert molar mass measurements between grams per mole, kilograms per mole, and more.

What is Molar Mass Converter?

Molar mass is the mass of one mole of a substance. One mole contains exactly 6.022 × 10²³ particles (Avogadro's number). Molar mass bridges the macroscopic world (grams on a scale) and the microscopic world (individual atoms and molecules) and is fundamental in chemistry.

Understanding the Units

Gram per mole (g/mol)

The standard practical unit in chemistry. Numerically equal to atomic/molecular weight.

Common Uses: Lab work, stoichiometry, reaction calculations

Kilogram per mole (kg/mol)

The SI base unit of molar mass.

Common Uses: Some engineering and physics applications

Conversion: 1 kg/mol = 1,000 g/mol

Common Conversions

Hydrogen (H): 1.008 g/mol = 0.001008 kg/mol
Carbon (C): 12.011 g/mol = 0.012011 kg/mol
Water (H₂O): 18.015 g/mol = 0.018015 kg/mol
Sodium chloride (NaCl): 58.44 g/mol = 0.05844 kg/mol
Carbon dioxide (CO₂): 44.01 g/mol = 0.04401 kg/mol

Conversion Formulas

Moles = Mass ÷ Molar mass (n = m/M)
Mass = Moles × Molar mass (m = n × M)
g/mol to kg/mol: kg/mol = g/mol ÷ 1,000
kg/mol to g/mol: g/mol = kg/mol × 1,000
Number of molecules = Moles × 6.022 × 10²³

Practical Examples

1 mole of water (18 g) is roughly 18 mL of liquid water

Making 1 mol/L NaCl solution: dissolve 58.44 g in 1 litre of water

1 mole of CO₂ (44 g) occupies ~22.4 litres at standard conditions

Aspirin (C₉H₈O₄) has a molar mass of 180.16 g/mol

When to Use Each Unit

g/mol: Standard chemistry, lab stoichiometry, nutrition and pharmaceuticals

kg/mol: SI unit for engineering calculations and polymer science

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