Drug Concentration Calculator — calculate drug concentration using standard chemistry formulas. Worked example with units.
Molarity: M = n / V, where n = moles of solute, V = volume of solution in litres
Moles from mass: n = mass (g) / molar mass (g/mol)
Dilution equation: C₁V₁ = C₂V₂ (concentration × volume is conserved when diluting)
Molality: m = moles solute / kg solvent (different from molarity — used for colligative properties)