Molecular Weight Calculator for Students & Chemists: Step-by-Step Breakdown

Free Molecular Weight Calculator — Compute Molar Mass in Seconds

What it is

• A web tool that calculates the molecular (molar) mass of a chemical compound from its formula (e.g., H2O, C6H12O6).

Key features

• Instant calculation: Parses chemical formulas and returns molar mass in g·mol⁻¹ quickly.
• Elemental breakdown: Lists each element present, its count, atomic mass used, and contribution to total mass.
• Support for parentheses and coefficients: Handles nested groups (e.g., Ca3(PO4)2) and hydrates (e.g., CuSO4·5H2O).
• Units & precision: Displays result in g·mol⁻¹ and lets users choose decimal precision.
• Copy/export: Allows copying the result and breakdown or exporting as text/CSV for notes or reports.
• Mobile-friendly UI: Works on phones and desktops.

How it works (brief)

1. Parses the formula into element tokens and multipliers.
2. Looks up standard atomic masses for each element.
3. Multiplies element atomic mass × count and sums contributions.
4. Applies decimal precision and formats the output.

Use cases

• Chemistry students checking homework.
• Lab technicians preparing solutions and reagents.
• Educators demonstrating molar mass calculation steps.
• Anyone converting between moles and grams for reactions or stoichiometry.

Limitations

• May not handle nonstandard notation (e.g., ambiguous element symbols) or empirical formulas without explicit counts.
• Relies on a chosen set of atomic mass values (slight variations exist between sources).
• Not a substitute for professional software when isotopic composition or high-precision masses are required.

Example

• Input: C6H12O6
• Output: Molar mass = 180.16 g·mol⁻¹ (breakdown: C: 6×12.011, H: 12×1.008, O: 6×15.999)