Mole Conversion Calculator
Mole conversion calculator — enter moles, number of particles, or mass with a molar mass, and get the rest using the Avogadro constant (6.022×10²³). Curriculum-aligned.
Mole Conversion Calculator
Enter one value — moles, number of particles, or mass with a molar mass — and the calculator works out the rest. Uses Nₐ = 6.022 × 10²³.
- Curriculum
- English (global) — Cambridge International + IB
- Built against
- Cambridge IGCSE Chemistry 0620 + IB Diploma (2023–2025) — The Mole & Avogadro Constant
- Unit system
- SI primary; US/imperial readout below
- First published
- 2 Jun 2026
- Last updated
- 2 Jun 2026
View authoritative scientific sources
- IUPAC — 2019 redefinition of the mole (Nₐ = 6.02214076×10²³)
- BIPM SI Brochure, 9th edition (2019)
- NIST — Avogadro constant
- Avogadro constant — Encyclopædia Britannica
⚠️ Educational use only — see full disclaimer
EDUCATIONAL USE DISCLAIMER
This calculator is provided for educational and reference purposes only. It is not a substitute for instruction from a qualified teacher, your prescribed textbook, or your school's official curriculum materials.
When preparing for examinations, always cross-check our calculations and notation against your current syllabus and your teacher's guidance. Syllabus conventions and accepted notation vary between curricula and may change between examination years.
If you believe any calculation, notation, or curriculum reference in this tool is inaccurate, please let us know via the feedback button. We review feedback promptly and update tools when verified corrections are needed.
RECATOOLS accepts no liability for academic, examination, professional, or research outcomes arising from use of this tool.
How to Use the Mole Conversion Calculator
Pick your curriculum
Use the curriculum pills above to match your syllabus (Cambridge/IB, 高考 or SBMPTN). Terminology and the whole page follow your selection.
Enter one value
Type the number of moles, OR the number of particles, OR a mass together with the molar mass of the substance. The calculator finds the moles first.
Read the result
The result shows the moles, the number of particles (using the Avogadro constant), and the mass when a molar mass is given.
Check against your syllabus
The Tool Information block shows exactly which syllabus this is built against. Spot something off? Use the feedback button.
The Mole Concept, in Your Curriculum's Words
Mole Conversion (N = n × Nₐ)
Example: How many particles are in 18 g of water (H₂O, molar mass 18 g/mol)?
Given: mass = 18 g, Mr = 18 g/mol. Using n = mass / Mr then N = n × Nₐ:
n = 18 / 18 = 1 mol; N = 1 × 6.022 × 10²³ = 6.022 × 10²³ particles
A mole is the amount of a substance containing exactly 6.02214076 × 10²³ particles — the Avogadro constant (Nₐ). The number of particles is linked to the number of moles by N = n × Nₐ, and the moles to the mass by n = mass / molar mass. This calculator works both ways: give it any one quantity and it works out the rest.
Since 2019 the mole has been defined by fixing the Avogadro constant to an exact value, rather than by reference to carbon-12. Moles and numbers of particles have no imperial equivalent, so results are reported in SI scientific units only, often in scientific notation because the numbers are so large. All calculation happens in your browser — nothing is uploaded, and the tool works offline once loaded.
A mole of marbles would cover the entire surface of the Earth several kilometres deep — that is how large the Avogadro constant is.
10 Facts About the Mole Concept
One mole contains 6.022 × 10²³ particles.
That number is the Avogadro constant (Nₐ).
N = n × Nₐ links particles to moles.
n = mass / molar mass links grams to moles.
Since 2019 Nₐ has been fixed exactly.
1 mol of ideal gas occupies 22.4 L at STP.
Particles can be atoms, molecules or ions.
Named after Amedeo Avogadro.
The mole is the SI base unit for amount of substance.
This calculator runs in your browser — your working stays private.
Frequently Asked Questions
- The Avogadro constant (Nₐ) is the number of particles in one mole, equal to exactly 6.02214076 × 10²³. It links the amount in moles to the actual number of particles (atoms, molecules or ions) through N = n × Nₐ. Since 2019 its value has been fixed exactly as part of the definition of the mole.
- Enter one of three things: the number of moles, the number of particles, or a mass together with the molar mass of the substance. The calculator finds the moles first and then works out the rest. If you only know the mass, you need to enter the molar mass too.
- Moles are in mol, mass in grams (or mg/kg), and molar mass in g/mol. The number of particles is dimensionless — it is just a count. Because moles and particle counts have no imperial equivalent, results are reported in SI units only, often in scientific notation because the numbers are so large.
- Divide the mass by the molar mass of the substance: n = mass / Mr. For example 18 g of water divided by its molar mass of 18 g/mol gives 1 mol. Enter the mass and the molar mass, and the calculator does this step and then finds the number of particles.
- It depends on the substance — particles can be atoms (for elements like iron), molecules (for compounds like water) or ions. The Avogadro constant counts whatever basic units you mean by one mole.
- The chemistry is the same worldwide. What changes is the terminology; "amount of substance" is 物质的量 in Chinese, while SBMPTN students see the Indonesian term. The calculated value is the same.
- The Tool Information block lists the exact syllabus for your selected curriculum (e.g. SBMPTN/SNBT Kimia). It is a study aid, not a substitute for your official syllabus or teacher.
- No. Every calculation runs in your browser; nothing you type is uploaded. It works offline once the page has loaded.
- Completely free, no account or usage limit. It runs entirely in your browser and collects no data.
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