⚗️ Mole Calculator
Translate any substance quantity into moles, grams, volume at STP, and particle count with one tool.
Direct mole entry. Provide molar mass if you want the mass conversion.
Provide molar mass to enable mass conversions when starting from moles, volume, or particles.
Moles
1
Mass (g)
58.44
Requires molar mass input.
Volume at STP (L)
22.414
Assumes 22.414 L/mol.
Particles
6.0221e+23
Using Avogadro's number.
Start with any quantity and obtain all others instantly. For 1 mol, you have mass 58.44 g,22.414 L at STP, and 6.0221e+23 particles.
How to Use This Calculator
Choose the starting quantity
Pick whether you know moles, mass, gas volume at STP, or particle count. The input fields adjust automatically.
Enter values (and molar mass if needed)
Molar mass is required to translate between moles and grams. Gas volume conversions assume STP; adjust if conditions differ.
Review the conversions
The calculator outputs all related quantities, making it easy to jump between representations without redoing stoichiometry.
Apply in labs or assignments
Use the data to balance equations, size reagents, calculate yields, or check homework solutions involving the mole concept.
Formula
n = m / M
V_STP = n * 22.414 L
N = n * N_A
n is moles, m is mass (g), M is molar mass (g/mol), V_STP is volume at STP, and N_A is Avogadro's constant.
Example
0.250 mol of CO₂ has mass m = 0.250 * 44.01 = 11.0 g, occupies 0.250 * 22.414 = 5.60 L at STP, and consists of 0.250 * 6.022e23 = 1.51e23 molecules.
Full Description
The mole is the bridge between atomic-scale counts and laboratory measurements. Converting between grams, moles, volumes, and particle counts is a daily task in chemistry. This calculator automates those conversions, saving time and reducing mistakes.
Whether you are sizing reagents for synthesis, interpreting gas measurements, or checking stoichiometry assignments, the tool keeps every quantity in sync. Provide the molar mass of the substance to connect mass with moles and particles accurately.
Remember that gas volume conversions assume standard temperature and pressure. For non-STP conditions, combine the results with the ideal gas law to adjust volumes accordingly.
Frequently Asked Questions
Do I need molar mass for every calculation?
No. Molar mass is only required when converting between moles and grams. Other conversions (volume, particles) use constants.
What if gas conditions are not STP?
Use the ideal gas law to adjust: n = PV/(RT). Then feed the resulting moles into this calculator for additional conversions.
Can I use the tool for ions or formula units?
Yes. Particles can represent atoms, molecules, ions, or formula units—just ensure the molar mass matches the entity.
How precise are the outputs?
The calculator preserves up to six significant digits. For higher precision, carry more digits in your input values.
Can I convert to millimoles or micromoles?
Yes. Multiply the mole output by 1000 for millimoles or by 1e6 for micromoles. Future updates may surface these directly.