Free Online Convert Between Millimolar (mM) & Molar (M)

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Convert between Millimolar (mM) and Molar (M) instantly with our free online unit calculator. You can easily convert both mM to M and M to mM with just a few clicks. To switch between the two conversions, simply use the swap icon (rotating arrows). If you need to start over, you can reset the values by clicking the reset button.


Result: Millimolar = Molar

i.e. mM = M

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What does Millimolar mean?

When working with solutions in chemistry, one important aspect to consider is the concentration of the solute in the solvent. One common unit of concentration is the millimolar (mM), which represents the number of millimoles of solute per liter of solution. In this article, we will delve deeper into the millimolar unit and its significance in chemistry.

Definition of Millimolar (mM)

A millimole is a unit of measurement used in chemistry to represent the amount of a substance present in a solution. One millimole (mmol) is equal to one-thousandth of a mole (mol), which is the standard unit of measurement for the amount of a substance. A mole is defined as the amount of a substance that contains the same number of particles (atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12.

The millimolar unit is simply a measure of the concentration of a solute in a solution, with the number of millimoles of solute per liter of solution. For example, a solution with a concentration of 1 mM contains 1 millimole of solute per liter of solution.

Why Use Millimolar (mM)?

The millimolar unit is commonly used in biochemistry, pharmacology, and other fields of chemistry where precise measurements of concentration are necessary. This is because many biological reactions and processes involve the interaction of molecules that are present in very small quantities. Using millimolar concentrations allows scientists to accurately measure and control the amount of a substance in a solution.

Another advantage of using millimolar concentrations is that they are relatively easy to work with. Since a millimole is simply one-thousandth of a mole, it is easy to convert between millimolar and other concentration units such as micromolar (µM) and nanomolar (nM).

How to Calculate Millimolar Concentration

To calculate the millimolar concentration of a solution, you need to know the number of millimoles of solute present and the volume of the solution in liters. The formula for calculating millimolar concentration is:

millimolar concentration = (number of millimoles of solute) / (volume of solution in liters)

For example, if you have a solution that contains 5 millimoles of solute in 500 milliliters of the solution, you can calculate the millimolar concentration as follows:

millimolar concentration = (5 mmol) / (0.5 L) = 10 mM

This means that the concentration of the solute in the solution is 10 millimoles per liter.


A millimolar unit is an important unit of concentration in chemistry, particularly in biochemistry and pharmacology. It allows scientists to accurately measure and control the amount of a substance in a solution, which is important for many biological reactions and processes. Knowing how to calculate millimolar concentrations is essential for working with solutions in these fields and can help ensure accurate and reproducible results.

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What does Molar mean?

Molar (symbol: M) is a unit of concentration that measures the amount of a substance per unit of volume. Specifically, molar concentration represents the number of moles of solute (a substance being dissolved) per liter of solution.

One mole is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in exactly 12 grams of pure carbon-12. The number of entities in one mole is called Avogadro's number, which is approximately 6.022 x 10^23.

For example, a solution with a molar concentration of 1 M contains one mole of solute per liter of solution. This means that there are 6.022 x 10^23 molecules (or other entities) of the solute present in each liter of solution.

Molar concentration is commonly used in chemistry, biochemistry, and other scientific fields to express the concentration of substances in a solution. It is particularly useful for measuring the concentration of ions in a solution, such as in acid-base reactions.

To convert between molar concentration and other concentration units, such as millimolar (mM) or micromolar (μM), conversion factors must be used. For example, one millimole (mmol) of solute per liter of solution is equivalent to 1 mM, and one micromole (μmol) per liter is equivalent to 1 μM. Conversely, one M is equal to 1000 mM or 1,000,000 μM.

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In this unit converter website, we have converter from Molar (M) to some other Amount of Substance unit.

What does Amount of Substance mean?

Amount of substance is a physical quantity that measures the quantity of a chemical substance in a sample, usually measured in moles (mol). It is also referred to as a chemical amount or simply an amount.

The International System of Units (SI) defines the mole as the amount of substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number and is approximately equal to 6.022 x 10^23 entities per mole.

The mole is a fundamental unit of measurement in chemistry and is used to express quantities of chemical substances in chemical equations, reactions, and other chemical processes. For example, the equation for the combustion of methane (CH4) can be expressed as:

CH4 + 2O2 → CO2 + 2H2O

In this equation, one molecule of methane (which has a molar mass of 16.04 g/mol) reacts with two molecules of oxygen (which have a molar mass of 31.998 g/mol) to produce one molecule of carbon dioxide (which has a molar mass of 44.01 g/mol) and two molecules of water (which have a molar mass of 18.02 g/mol each).

The amount of substance is often used in stoichiometry calculations, which involve determining the amounts of reactants and products in a chemical reaction. In these calculations, the amount of substance is used to convert between mass, volume, and other physical properties of the substances involved.

The mole is also used in analytical chemistry to express concentrations of solutions. For example, the concentration of a solution can be expressed in moles per liter (mol/L) or millimoles per liter (mmol/L).

In addition to the mole, other units of the amount of substance include the pound-mole (lb-mol) and the gram-mole (g-mol). However, these units are not commonly used in the SI system.

Overall, the amount of substance is a fundamental concept in chemistry and is essential for understanding chemical reactions and processes.

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The following Amount of Substance related conversions are available in our website:

How to convert Millimolar to Molar : Detailed Description

Millimolar (mM) and Molar (M) are both units of Amount of Substance. On this page, we provide a handy tool for converting between mM and M. To perform the conversion from mM to M, follow these two simple steps:

Steps to solve

Have you ever needed to or wanted to convert Millimolar to Molar for anything? It's not hard at all:

Step 1

  • Find out how many Molar are in one Millimolar. The conversion factor is 0.001 M per mM.

Step 2

  • Let's illustrate with an example. If you want to convert 10 Millimolar to Molar, follow this formula: 10 mM x 0.001 M per mM = M. So, 10 mM is equal to M.
  • To convert any mM measurement to M, use this formula: mM = M x 0.001. The Amount of Substance in Millimolar is equal to the Molar multiplied by 0.001. With these simple steps, you can easily and accurately convert Amount of Substance measurements between mM and M using our tool at Pyron Converter.

FAQ regarding the conversion between mM and M

Question: How many Molar are there in 1 Millimolar ?

Answer: There are 0.001 Molar in 1 Millimolar. To convert from mM to M, multiply your figure by 0.001 (or divide by 1000.0).

Question: How many Millimolar are there in 1 M ?

Answer: There are 1000.0 Millimolar in 1 Molar. To convert from M to mM, multiply your figure by 1000.0 (or divide by 0.001).

Question: What is 1 mM equal to in M ?

Answer: 1 mM (Millimolar) is equal to 0.001 in M (Molar).

Question: What is the difference between mM and M ?

Answer: 1 mM is equal to 0.001 in M. That means that M is more than a 1000.0 times bigger unit of Amount of Substance than mM. To calculate mM from M, you only need to divide the M Amount of Substance value by 0.001.

Question: What does 5 mM mean ?

Answer: As one mM (Millimolar) equals 0.001 M, therefore, 5 mM means M of Amount of Substance.

Question: How do you convert the mM to M ?

Answer: If we multiply the mM value by 0.001, we will get the M amount i.e; 1 mM = 0.001 M.

Question: How much M is the mM ?

Answer: 1 Millimolar equals 0.001 M i.e; 1 Millimolar = 0.001 M.

Question: Are mM and M the same ?

Answer: No. The M is a bigger unit. The M unit is 1000.0 times bigger than the mM unit.

Question: How many mM is one M ?

Answer: One M equals 1000.0 mM i.e. 1 M = 1000.0 mM.

Question: How do you convert M to mM ?

Answer: If we multiply the M value by 1000.0, we will get the mM amount i.e; 1 M = 1000.0 Millimolar.

Question: What is the M value of one Millimolar ?

Answer: 1 Millimolar to M = 0.001.

Common Millimolar to Molar conversion

mM M Description
0.1 mM 0.0 M 0.1 mM to M = 0.0
0.2 mM 0.0 M 0.2 mM to M = 0.0
0.3 mM 0.0 M 0.3 mM to M = 0.0
0.4 mM 0.0 M 0.4 mM to M = 0.0
0.5 mM 0.001 M 0.5 mM to M = 0.001
0.6 mM 0.001 M 0.6 mM to M = 0.001
0.7 mM 0.001 M 0.7 mM to M = 0.001
0.8 mM 0.001 M 0.8 mM to M = 0.001
0.9 mM 0.001 M 0.9 mM to M = 0.001
1 mM 0.001 M 1 mM to M = 0.001
2 mM 0.002 M 2 mM to M = 0.002
3 mM 0.003 M 3 mM to M = 0.003
4 mM 0.004 M 4 mM to M = 0.004
5 mM 0.005 M 5 mM to M = 0.005
6 mM 0.006 M 6 mM to M = 0.006
7 mM 0.007 M 7 mM to M = 0.007
8 mM 0.008 M 8 mM to M = 0.008
9 mM 0.009 M 9 mM to M = 0.009
10 mM 0.01 M 10 mM to M = 0.01
20 mM 0.02 M 20 mM to M = 0.02
30 mM 0.03 M 30 mM to M = 0.03
40 mM 0.04 M 40 mM to M = 0.04
50 mM 0.05 M 50 mM to M = 0.05
60 mM 0.06 M 60 mM to M = 0.06
70 mM 0.07 M 70 mM to M = 0.07
80 mM 0.08 M 80 mM to M = 0.08
90 mM 0.09 M 90 mM to M = 0.09

Common Molar to Millimolar conversion

M mM Description
0.1 M 100.0 mM 0.1 M to mM = 100.0
0.2 M 200.0 mM 0.2 M to mM = 200.0
0.3 M 300.0 mM 0.3 M to mM = 300.0
0.4 M 400.0 mM 0.4 M to mM = 400.0
0.5 M 500.0 mM 0.5 M to mM = 500.0
0.6 M 600.0 mM 0.6 M to mM = 600.0
0.7 M 700.0 mM 0.7 M to mM = 700.0
0.8 M 800.0 mM 0.8 M to mM = 800.0
0.9 M 900.0 mM 0.9 M to mM = 900.0
1 M 1000.0 mM 1 M to mM = 1000.0
2 M 2000.0 mM 2 M to mM = 2000.0
3 M 3000.0 mM 3 M to mM = 3000.0
4 M 4000.0 mM 4 M to mM = 4000.0
5 M 5000.0 mM 5 M to mM = 5000.0
6 M 6000.0 mM 6 M to mM = 6000.0
7 M 7000.0 mM 7 M to mM = 7000.0
8 M 8000.0 mM 8 M to mM = 8000.0
9 M 9000.0 mM 9 M to mM = 9000.0
10 M 10000.0 mM 10 M to mM = 10000.0
20 M 20000.0 mM 20 M to mM = 20000.0
30 M 30000.0 mM 30 M to mM = 30000.0
40 M 40000.0 mM 40 M to mM = 40000.0
50 M 50000.0 mM 50 M to mM = 50000.0
60 M 60000.0 mM 60 M to mM = 60000.0
70 M 70000.0 mM 70 M to mM = 70000.0
80 M 80000.0 mM 80 M to mM = 80000.0
90 M 90000.0 mM 90 M to mM = 90000.0