How to use this calculator

Answer the stress, sleep, activity, and social-support questions — no lab tests required for those. Add any of the optional physiological markers you have (resting heart rate, waist circumference, blood pressure, HbA1c, CRP) for a fuller picture.

What your result means

This is a self-report plus optional-biomarker composite in the spirit of the academic "allostatic load" concept — chronic-stress wear-and-tear, first described by McEwen & Stellar (1993), typically combining cardiovascular, metabolic, and inflammatory markers into one index. It is not a single validated clinical score with one agreed formula, so treat the tier as directional.