Holmes-Rahe Stress Scale Calculator

This calculator interprets a life-event total that you have already assembled from the Holmes-Rahe checklist, the Social Readjustment Rating Scale (SRRS) that Thomas Holmes and Richard Rahe published in 1967 after asking patients to rate how much readjustment each of 43 common life events required relative to marriage (arbitrarily fixed at 50 life-change units). It rounds the entered total to the nearest whole point and prevents a negative result. That processed number is shown unchanged as Total Stress Score, so the quality of the result depends primarily on including the relevant events and adding their life-change units correctly before entry. Two stepwise outputs are then assigned using the score bands and associated 2-year illness risk long published alongside the scale (see the American Institute of Stress's Holmes-Rahe Stress Inventory). A score below 150 produces risk level 1 and an illness-probability value of 30 percent. Scores from 150 through 299 produce level 2 and 50 percent. At 300 or above, the outputs become level 3 and 80 percent.

These are fixed lookup bands in this engine, not a continuously changing probability model. Thus, 149 and 150 differ by one stress point but fall into different categories, while 300 and 900 receive the same category and probability. The calculation does not know which events created the total, whether events were positive or negative, whether they overlapped, or how the person perceived and managed them. It also omits coping resources, social support, existing illness, trauma history, and individual susceptibility. The percentage is a scale interpretation embedded in the calculator rather than a personalized forecast. It should be read as a broad stress-load indicator, not as a prediction that a particular person will become ill.