Molar Mass Calculator

Calculate the molar mass of a chemical compound from its chemical formula. Supports elements from the periodic table.

Chemical Formula

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Result

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Enter the chemical formula of your compound into the input field. Use standard element symbols (e.g., H2O for water, C6H12O6 for glucose). Include parentheses for polyatomic ions or groups (e.g., Ca(OH)2 for calcium hydroxide). Click the 'Calculate' button to process the formula. View the calculated molar mass in grams per mole (g/mol) displayed below the input. Optionally, copy the result or clear the field to start a new calculation.

📖 How to Use This Tool

Enter the chemical formula of your compound into the input field. Use standard element symbols (e.g., H2O for water, C6H12O6 for glucose).

Include parentheses for polyatomic ions or groups (e.g., Ca(OH)2 for calcium hydroxide).

Click the 'Calculate' button to process the formula.

View the calculated molar mass in grams per mole (g/mol) displayed below the input.

Optionally, copy the result or clear the field to start a new calculation.

📝 What Is Molar Mass Calculator?

A molar mass calculator is a quick, accurate tool that computes the mass of one mole of a chemical substance based on its molecular formula. It sums the atomic masses of all atoms present, using the standard periodic table values. This number is essential for converting between mass and moles in stoichiometric calculations, preparing solutions, and understanding reaction yields. By automating the tedious manual addition, the calculator saves time and reduces errors, making it indispensable for students, chemists, and lab technicians. Whether you are balancing equations or diluting a reagent, knowing the molar mass is the first step to precise chemistry.

🧮 Formula

Molar Mass = Σ (Atomic Mass of Element × Number of Atoms of That Element). The tool automatically multiplies each element's standard atomic weight (in g/mol) by its subscript count in the formula, including subscripts inside parentheses. For example, in H₂O: 2 × 1.008 (H) + 1 × 16.00 (O) = 18.016 g/mol.

💡 Tips for Best Results

✨🧪 Always use correct capitalization — 'Co' is cobalt, 'CO' is carbon monoxide.

✨📌 For complex molecules, enclose polyatomic ions in parentheses (e.g., Fe₂(SO₄)₃).

✨🔍 Double-check that you haven't omitted subscripts of 1 — they are assumed but still count.

✨⚖️ Compare your calculated result with known values to catch typos in the formula.

❓ Frequently Asked Questions

What is molar mass and why is it important?

Molar mass is the mass of one mole of a substance (6.022×10²³ particles). It is crucial for converting between grams and moles in chemical reactions, preparing solutions of known concentration, and calculating yields.

How does the calculator handle parentheses in formulas?

The tool interprets parentheses correctly, multiplying the atomic counts inside by the subscript outside. For example, Ca(OH)₂ becomes Ca ×1, O ×2, H ×2, giving the total molar mass of calcium hydroxide.

What should I do if my formula contains brackets or nested groups?

Our calculator supports nested parentheses (e.g., [Cu(NH₃)₄]SO₄). Enter the formula exactly as written, using brackets or parentheses. The tool processes them in the correct order to compute the molar mass.