Whether you're trying to make your homework go by a bit faster, forgot your scientific calculator in class, or are just trying to check your work, our molarity calculator is the way to go.

    With more than 12 units, our molarity calculator takes the guesswork out of conversions. It's easy to use and guarantees the most accurate answers.

    Have questions about the molarity of a solution? Check out this article for a detailed FAQ session on what molarity is and why it's important.


    Why use a molarity calculator?

    A molarity concentration calculator does the difficult conversions for you.

    Sometimes those hard conversions can take more than 20 minutes for just one problem when you try to do it on paper.

    Aside from the glaring fact that conversions can be difficult to tackle, our conversion calculator can also be used for personal, business, or commercial purposes.

    Whatever the reason, having a calculator is favorable to solving molarity concentration problems.

    Getting Started

    Using our molarity calculator is as easy as opening a new browsing tab. So, how does it work? The steps are simple:

    1. Under the input tab, select the starting unit (the unit that you're converting from)
    2. Under the output tab, select the ending unit (the unit that you're converting to)
    3. Enter the value that needs to be converted into the value box above.

    The final conversion result will be displayed in the output box. Want to change between units? Just hit swap!

    What is the molarity of a solution?

    Molarity is defined as the concentration of a solution, expressed as the number of moles of solute per liter of solution.

    Let's go over that in a way that is easier to understand.

    The molarity of a solution is simply the measurement of the concentration of the solution at a molecular level.

    Why Its Important

    It is important for scientists to know the molarity of a solution because the concentration of a solution changes its properties.


    Water boils at 212°F. If you add salt to the water, it will elevate the boiling point and lower the freezing point.

    Have you ever tried to measure the amount of salt you put into a pot of water after it's dissolved? It's nearly impossible.

    The salt looks like it's totally gone, but it's elements are definitely still there, and they're affecting the water's properties.


    The smallest changes can make the biggest differences, and chemists need a way to measure those changes.

    This is why we have molarity, so we can calculate the concentration of a solution from its molecular level.

    What is the standard unit of molarity?

    Molarity is represented by "M". The standard unit is measured in mol/L, though you'll likely encounter many different measurements.

    Moles can be measured in many different unit sizes. Think about an easier unit of measurement, like the meter, for example. Meters measure distance.

    Just like meters, moles use conversions such as kilomole or millimole and cm3, mm3 or m3. Our molarity concentration calculator is equipped to convert between all of these units, and more.

    How do you convert between molarity units?

    When converting molarity you may have to use certain conversion factors for the amount of solute and the volume. Let's go over an example.

    Mol/L to mmol/m3

    Let's say you need to convert 0.5 mol/L to mmol/m3. The conversion factor you'll use is 106.

    = 0.5 mol/L x 106

    = 500,000 mmol/m

    Calculating molarity can be done on paper, just like any math problem. While you may have to do it by hand in certain situations, there's no reason why you can't use a calculator to help you with your work.

    Even if you choose to go the pencil and paper route, our molarity calculator is an easy way to check the accuracy of your work.

    What is the formula for finding the molarity?

    To find molarity, we take the number of moles in a solute and divide by the volume of the solution in liters.

    It is written as such:

      Molarity = moles of a solute / liters of a solution

    Molarity can be calculated using moles and volume, mass and volume, or moles and milliliters.

    What if you don't have the moles of the solute?

    Using the periodic table, you can find the molar mass of a solution.

    Step One

    Start by finding out the molecular formula of the molecule.

    As an example, glucose is C6H12O6

    Step Two

    Establish the atomic mass of each element in the molecular formula using a periodic table.

    In the case of glucose:

    • carbon (C) = 12.0107
    • hydrogen (H) = 1.00794
    • oxygen (O) = 15.999

    Step Three

    Next, you'll multiply the atomic mass of each element by the number of atoms of that element in the molecule. This is the subscript number next to each element symbol in the molecular formula.

    So for glucose (C6H12O6) you would do the following:

    Carbon = 12.0107 x 6
    = 72.0642

    Hydrogen = 1.00794 x 12
    = 12.09528

    Oxygen = 15.999 x 6
    = 95.994

    Step Four

    Add the resulting figures together to determine the compound's molecular mass.

    Continuing with the above example, glucose has a molecular mass of 180.15348.

    glucose = 72.0642 + 12.09528 + 95.994
    = 180.15348

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