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Solution concentration

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Solution concentration diagram
The solution concentration (both molarity and mass-volume fraction) is calculated by dividing the amount of substance by the volume of the solution. For molar concentrations, the molecular weight is also required in order to calculate the number of molecules in the given mass of solute.
Mass of solute
Volume of solution
Molecular mass of solute

Molecular concentration
Mass concentration
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This calc gives both molar and mass-weight fraction (mass of solute in grams per cubic cm) concentrations, since either or both may be useful. Analytical chemistry generally uses concentrations in the mM or less range, and environmental monitoring makes use of even ppb (parts per billion).