Abstract: A device or system is provided for calculating and visualising the risk for developing coronary heart disease which is in the form of a cardiovascular risk diagram which includes a series of cardiovascular risk scales projected on cardiovascular risk areas (for example, delineated by different colours) each scale representing a different cardiovascular risk factor. Data for each cardiovascular risk is recorded on its appropriate risk scale, and data points-on adjacent risk scales are connected to form enclosed area superimposed over the risk areas. The resulting enclosed area is visually or otherwise compared to the total area of all cardiovascular risk areas, to determine a score of cardiovascular risk.