UnitConMolar Concentration
Molar concentration, or molarity, measures the number of moles of solute dissolved per liter of solution. It is widely used in chemistry, biology, medicine, and laboratory preparation work. This converter helps compare common molarity units across small and large scales. It is especially useful in solution prep and test-result interpretation.
Common conversions
| From | To |
|---|---|
| 1 Mole per Liter (M) | 1,000 Millimole per Liter (mM) |
| 1 Millimole per Liter (mM) | 1,000 Micromole per Liter (µM) |
| 1 Mole per Liter (M) | 1,000,000,000 Nanomole per Liter (nM) |
| 0.1 Mole per Liter (M) | 100 Millimole per Liter (mM) |
| 500 Micromole per Liter (µM) | 0.5 Millimole per Liter (mM) |
Frequently asked questions
Molarity is moles of solute per liter of solution. It is one of the most common ways to express chemical concentration.
A 1 M solution contains one mole of solute in each liter of final solution. The capital M is shorthand for mol/L.
Divide by 1000 to convert mmol/L to mol/L. To go the other way, multiply mol/L by 1000.
Molarity is based on solution volume, while molality is based on solvent mass. That means molarity can shift slightly with temperature when volume changes.