Despite one of the world's highest coronavirus-related death rates per capita, only 59% of Polish citizens decided to receive COVID-19 vaccine.[1] Such hesitancy toward vaccination has often been associated with a perception that the risk of being severely infected affects only very narrow group of individuals with certain risk factors and comorbidities.[2] Thus, educational efforts aimed at increasing the community knowledge on actual prevalence and impact of personal risk factors for severe COVID-19 are still warranted.[3] On the contrary, however, quantitative estimation of relative contributions of different host-related risk factors including comorbidities to the severe COVID-19 has still remained elusive.[4] Therefore, here we attempted not only to assess but also rather quantify to which extent well-known phenotypic and comorbid factors impact on the clinical severity of COVID-19. Heatmaps presenting the values of odds ratio for developing severe course of COVID-19 in man and woman based on age, sex, body mass index (BMI). Implementation of the web-based calculator estimating odds ratio of severe COVID-19 for unvaccinated individuals in a country with high coronavirus-related death toll. [Extracted from the article]