Mole Calculator

Put values to convert grams to moles in input box using this Mole Calculator.

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Mole formula

mole =mass/molecular weight


Are you struggling with questions like How to find/calculate moles? How to find moles from grams? How to convert grams to moles? Well, don’t worry! We have got it sorted out for you. 

No need to thank, just pay some cash, just kidding, good feedback is all we ask.

Although the name of this calculator is the Mole calculator, in reality, it does much more than that! Using this awesome converter you can convert moles to mass and grams, grams to mass and moles, and last but not least mass to moles and grams.

We couldn’t name it as “moles, mass, and grams calculator”. That would have been a mouthful. But it is designed for all these works.

Before I tell you how to use this calculator, let’s first learn about this topic.

What is a Mole?

In chemistry, we are weighing substances continuously to perform reactions. We all know how tiny and invisible an atom is. So when we are doing some experiments in the lab, we cannot use kilograms or grams in the procedure. 

It is said because it would have made reactions much more difficult especially on a large scale. I’ll give you an example. Consider we need to know how many carbon atoms are in 12 grams of carbon. Although we know it’s roughly 6.02*1023atoms. But using this value in calculations is very difficult. 


This is why scientists needed to come up with a unit of measurement that would account for a large number of atoms, ions, and molecules. Because they are so small that there is an inconveniently large number of them in a single gram.


This is where Mole was introduced in chemistry. It is an SI unit for the amount of a substance. It is represented by “mol”.

Wondering how much is a mole? It means 6.02*1023, which is also Avagadro’s number. A mole of a substance represents Avogadro’s number of particles in it whether they exist in a free atomic state, in the form of molecules or ionic form.

  1. One mole of helium gas is equal to 6.02*1023 atoms.
  2. One mole of oxygen is equal to has 6.02*1023molecules.
  3. One mole of NaCl has 6.02*1023 Na and 6.02*1023 Cl ions.

Why Carbon?

There is no rocket science in it. Scientists could have used any element as standard. But Amedeo Avogadro chose carbon. Don’t worry too much about it.

What is the molecular weight?

The molecular weight of a molecule is the total weight of elements present in it. For example, if we want to calculate the molecular weight of benzene C6H6.

Atomic mass of one carbon = 12 u 

Atomic mass of one Hydrogen = 1.008 u

Atomic mass of benzene = 6*12 + 6*1.008

= 78.048 u

How to use our mole calculator?

After using our smart mole conversion calculator, you will be able to convert moles to atoms, molecules, and grams (g). 

Firstly: Choose what you want to calculate. For example, let’s say you want to find molecular weight.

Secondly: Enter the required values in respected places. In this case moles and mass. 

Lastly: Click calculate.

There you go, How fastly and easily this smart calculator calculated molecular weight using the formula for you! Not only that but also provide you with the whole procedure. On the topic of a good calculator, spare a minute to check our yield calculator.

Now let’s learn the concept of mole and its application through examples.

Example 1: ( grams to moles)

 How many moles are in 16 grams of oxygen gas?


Mass of oxygen = 15.999 =16 grams

Molecular weight = ( as oxygen exists in a molecular state in gaseous 

form) 2 * 16 = 32 g/mol

Mole = 32/32

It has one mole.

Example 2: ( moles to atoms)

Calculate the number of atoms in 13 moles of fluorine gas.


Moles = 13

One molecule of fluorine = 2 atoms

As one mole has Avogadro’s number of particles and in a gaseous state, fluorine atoms form a molecule of 2 atoms. So,

One mole has 6.02*1023molecules.
13 moles have 13*6.02*1023molecules.
 Finally, 13 moles have 2*13*6.02*1023atoms. Which are1.5652*1025  atoms.

Example 3: ( mass to moles)

Calculate moles for 5 grams of nitrogen atoms.


Mass = 5grams

Molecular weight = 14 g/mol

Now using the mole formula,

mole =mass/molecular weight

mole =5/14

It has 0.357 moles.

Example 4: ( mass to ions)

Calculate ions of sodium and chloride in 20 grams of NaCl.


Mass = 20

Molecular weight = 58.44 g/mol

Converting grams to moles.

mole =20/58.44

It has 0.34 moles.

Now as we know one mole has Avogadro’s number of particles.

So one mole how many particles are in 0.34 moles?

Molecules of NaCl = 0.34 moles6.02*1023

= 2.0468*1023molecules.

Ions in one molecule = 1 Na+ + 1 Cl-

= 2 ions

Total ions in 20 grams of NaCl= 22.0468*1023

= 4.0936*1023

In which there are

Na+ions = 2.0468*1023molecules.

Cl-ions = 2.0468*1023molecules.

To find the molar mass of gaseous compounds, use our molar mass of gas calculator.


  • How many grams are in a mole?

One mole is equal to 114.818 grams.

  • How many molecules in a mole?

There is Avogadro’s number of molecules in a gram. 

  • How many atoms in a gram?

It varies for every element. We’ll have to calculate moles and multiply it by 6.02*1023 to find atoms.

  • Are molar mass and molecular mass the same?

No, they represent two different matrices. Molecular mass is the molecular weight, atomic masses of all the elements in a molecule added together, of a molecule while molar mass represents the weight of one mole of a substance.


  1. Mole | Definition, Number, & Facts. Encyclopedia Britannica.
  2. What Is a Mole and Why Is It Used in Chemistry?. ThoughtCo.
  3. The Mole.