The cholesterol/HDL ratio, or the ratio of total cholesterol to high-density lipoprotein cholesterol, is a simple calculation that divides the total cholesterol level by the level of good cholesterol (HDL-C). This ratio reflects the balance between total blood cholesterol (which includes both LDL and HDL) and the strength of the protective factor (HDL). It is a traditional and robust indicator for predicting the risk of coronary heart disease, with the ratio increasing as the risk increases.