Normally, our concentrations are given in units of milligrams per milliliter (mg/ml), but often data sheet quality assurance data are expressed in molarity (moles per liter, M) or fractions of that — e.g., micromolar (µM, 10-6 M) or nanomolar (nM, 10-9 M).
Below are calculations to convert between these units. Or view the worksheet.