Mole Calculator
Enter molar mass (or pick a preset compound), then input any one of: mass in grams, moles, or number of particles — the other two update instantly.
Mole Calculator
Enter molar mass and any one quantity to convert.
Or type any molar mass above.
Enter a molar mass and at least one quantity to see results.
Conversion Results
Moles
—
mol
Mass
—
grams
Number of Particles
—
particles
Formulas Used
Moles from mass
n = m / M
Mass from moles
m = n × M
Particles from moles
N = n × Nₐ
Nₐ = 6.02214076 × 10²³ mol⁻¹ (Avogadro's number)
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Summary
Enter molar mass (or pick a preset compound), then input any one of: mass in grams, moles, or number of particles — the other two update instantly.
How it works
- Select a preset compound from the dropdown or type any molar mass in g/mol into the Molar Mass field.
- Enter a value in any one of the three fields: Moles, Mass (grams), or Number of Particles.
- The calculator applies the relationships n = m / M and N = n × Nₐ to fill in the remaining two fields.
- Change any field at any time — results update immediately without pressing a button.
- Use the Reset button to clear all fields and start a new calculation.
Use cases
- Converting a weighed mass of a reagent into moles before a stoichiometry calculation.
- Determining how many molecules are present in a given sample mass.
- Checking homework or exam answers for mole-gram-particle conversions.
- Preparing solutions in a chemistry lab by calculating the exact mass needed.
- Teaching introductory chemistry concepts relating mass, moles, and Avogadro's number.
Frequently Asked Questions
Last updated: 2026-06-18 ·
Reviewed by Nham Vu