Potassium is measured in milliequivalents, whereby 1 mEq equals 75 mg of potassium chloride, and 102 mg of potassium citrate. The amount of elemental potassium contained in a supplement is calculated by multiplying the mEq by 39, its atomic weight. So an 8 mEq 600 mg Potassium Chloride tablet provides 312 mg of elemental potassium, while a 25 mEq 2,552 mg Potassium Citrate tablet provides 975 mg of elemental potassium... Full Text