Human vulnerability towards extreme heat exposure has generally been expressed as the cumulative expression of social, demographic, agricultural, environmental factors. Besides this, behavioural and physiological characteristics of individual may be responsible for significant differences in thermal perception and health effects towards extreme heat. The present endeavour is towards the identification and derivation of the quantitative scale of human-thermal vulnerability considering the social, human and thermal indicators. The study illustrates district-wise and village-wise human vulnerability considering different conventional indicators from social and environmental domain along with the factors accountable towards human warmth. The vulnerability was assessed, as representative for the state of Punjab, Haryana and West Bengal of India. Principle Component Analysis (PCA) was used as means of aggregating diverse indicators and to develop clusters of different variables as the respective principal components. The analysis indicated the utility of the expression of different types of vulnerability and the reasons to consider various indicators and their relative weightages. Accordingly, a quantitative scale of human-thermal vulnerability is arrived at, considering the social, human and thermal indicators.