Particle to Mole Calculator

Convert particle counts to moles with precision and clarity. Adjust Avogadro constant, significant figures, and scientific notation. Handle atoms, molecules, ions, or formula units effortlessly. Batch results, quickly export CSV or PDF, and share reports. Built for classrooms, labs, and rigorous everyday problem solving.

Input

Particle count

Accepts integers or scientific notation (e.g., 3.01e22).

Particle type

Significant figures

Avogadro constant

Use scientific notation in outputs

Result

Moles (mol)

—

Millimoles (mmol)

—

Formula used

n = N / N_A

n = amount of substance (moles)
N = number of particles (atoms, molecules, ions, etc.)
N_A = Avogadro constant (typically 6.02214076×10²³ mol⁻¹)

How to use

Enter the particle count using normal or scientific notation.
Select the particle type for labeling your results.
Choose significant figures and the Avogadro constant preset or custom.
Click Calculate to compute moles and millimoles.
Click Add to table to build a result list.
Export your table using CSV or PDF buttons below.

Results table

0 rows

#	Timestamp	Particle count	Type	N_A (mol⁻¹)	Moles (mol)	Millimoles (mmol)

Example data

Particle count	Type	Expected moles (mol)	Note
6.02214076e23	formula units	1	Exactly one mole by definition.
3.01107038e23	molecules	0.5	Half a mole of molecules.
1.00000000e23	atoms	≈1.66054e-1	About 0.166 mol of atoms.
1.20442815e24	particles	2	Two moles of generic particles.

All examples assume N_A = 6.02214076×10²³ mol⁻¹.

Avogadro constant quick facts

Name	Avogadro constant
Symbol	N_A
Value	6.02214076×10²³
Unit	mol⁻¹
Status	Exact (defines the mole in the SI)
Implication	One mole contains exactly 6.02214076×10²³ entities

Use custom N_A only for legacy textbook values or sensitivity checks.

Common particle counts to moles

Particle count (N)	Approx moles (n)	Note
6.02214076e23	1	Exactly one mole
3.01107038e23	0.5	Half a mole
1.20442815e24	2	Two moles
1.00000000e23	≈0.166054	About one-sixth of a mole
2.50000000e22	≈0.04154	Good for trace amounts
1.00000000e25	≈16.6054	Large batch conversion

Computed with N_A = 6.02214076×10²³ mol⁻¹.

Significant figures and notation guide

Input	Interpreted as	Sig figs	Comment
5000	5.0×10³ (ambiguous)	1–4	Trailing zeros without decimal are ambiguous
5000.	5.000×10³	4	Decimal point makes zeros significant
5.00e3	5.00×10³	3	Scientific notation sets significance clearly
3.010e22	3.010×10²²	4	Zero between digits is significant
0.00120	1.20×10^-3	3	Leading zeros not significant
6.02214076e23	Exact constant	—	Defines the mole in the SI

Choose a sig-fig setting above to format your outputs consistently.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.