How do I convert mass concentration to molar concentration?

Divide the mass concentration (in g/L) by the molar mass (in g/mol). The result is the molar concentration in mol/L (M). For example, 18 g/L of glucose (molar mass 180 g/mol) equals 0.1 mol/L.

What units are used in this calculator?

The calculator uses grams per liter (g/L) for mass concentration and grams per mole (g/mol) for molar mass. The output is molar concentration in moles per liter (mol/L), which is also called molarity (M).

Can I use this calculator for any solute?

Yes, as long as you know the solute's molar mass (g/mol). The calculator works for any chemical compound or element, provided you enter the correct molar mass.

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Mass Concentration to Molar Concentration Calculator.

Convert mass concentration to molarity with an explicit molar mass.

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Mass concentration

Molar mass

Molarity

0,171116mol/L

Educational arithmetic only. Keep units consistent and use measured or explicitly supplied chemistry inputs; this tool does not infer reaction pathways, property tables, or safety guidance.

Use Cases

Prepare laboratory solutions

When you have a stock solution with a known mass concentration, use this calculator to find its molarity for dilutions or reactions.

Example: A 50 g/L NaCl solution (molar mass 58.44 g/mol) is 0.856 mol/L.

Check concentration in experiments

Convert measured mass concentrations from analytical methods to molar concentrations for stoichiometric calculations.

Example: If a sample has 2.5 g/L of KCl (molar mass 74.55 g/mol), molarity is 0.0335 mol/L.

Frequently Asked Questions

How do I convert mass concentration to molar concentration?: Divide the mass concentration (in g/L) by the molar mass (in g/mol). The result is the molar concentration in mol/L (M). For example, 18 g/L of glucose (molar mass 180 g/mol) equals 0.1 mol/L.
What units are used in this calculator?: The calculator uses grams per liter (g/L) for mass concentration and grams per mole (g/mol) for molar mass. The output is molar concentration in moles per liter (mol/L), which is also called molarity (M).
Can I use this calculator for any solute?: Yes, as long as you know the solute's molar mass (g/mol). The calculator works for any chemical compound or element, provided you enter the correct molar mass.

Tips & Common Mistakes

Tips

Always use the same units: mass concentration in g/L and molar mass in g/mol. If your mass concentration is in mg/L, convert to g/L first.
Double-check the molar mass of your solute; use the periodic table or a reliable source. Small errors can significantly affect the result.
For hydrated compounds, include the water of crystallization in the molar mass calculation.
Remember that molarity is temperature-dependent because volume changes with temperature; this calculator assumes standard conditions.

Common Mistakes to Avoid

Forgetting to convert mass concentration to g/L if it's given in mg/L or other units.
Using the molecular weight of the solute incorrectly, such as using the atomic weight instead of the molar mass for a compound.
Confusing molar concentration (mol/L) with molality (mol/kg) – this calculator gives molarity, not molality.

Last updated: August 13, 2026