Convert between moles and the number of particles (atoms, molecules, or ions) using Avogadro's constant. Discover just how massive a mole really is.
Conversion Parameters
mol
Calculation Results
Enter the amount in moles to calculate the total number of particles
Scale Comparison: Moles vs Particles
Exponential growth: 10× more moles = 10× more particles
About this calculator
Overview
Avogadro's constant (Nₐ = 6.022 × 10²³ mol⁻¹) is the bridge between the microscopic world of atoms and the macroscopic world we see every day. It defines the 'mole', a unit that allows chemists to count atoms by weighing them. Think of it like a 'Chemist's Dozen'—but instead of 12, it's 602 hexillion!
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Pro Tips
Use scientific notation for very large or small numbers (e.g., 1.5e-3).
Remember: 1 mole always contains 6.022 × 10²³ particles, regardless of the substance.
The mass of 1 mole of a substance in grams is numerically equal to its atomic mass in amu.
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Fun Facts
"If you had a mole of rice grains, it would cover all the land area of the Earth to a depth of about 75 meters!"
"A computer counting at 800 million counts per second would take over 25 million years to reach Avogadro's number."
"One mole of water molecules (18 mL) contains more water molecules than there are stars in the observable universe."
"If you could stack 1 mole of pennies, the stack would reach the moon and back... 804 billion times."
"A mole of marshmallows would cover the entire United States in a layer 6,500 miles deep."
"Avogadro's constant is named after Amedeo Avogadro, but he never actually knew the number. It was calculated later by Jean Perrin."
"The number is so huge that if we shared a mole of dollars among everyone on Earth, each person would get about $80 trillion."
