COVID-19 Mortality Risk Calculator

About This Calculator

The COVID-19 Mortality Risk Calculator was created to improve public awareness about the importance of self-isolation and protective measures during a pandemic. It estimates an individual's relative mortality risk based on published fatality rate data stratified by age, sex, and pre-existing conditions.

Symptoms and Disease Progression

Symptoms of COVID-19 are non-specific, and the disease can present itself in many forms, from no symptoms (asymptomatic) to severe pneumonia and death. According to WHO, typical signs and symptoms include:

• Fever, dry cough, and fatigue
• Sputum production and shortness of breath
• Sore throat, headache, and body aches
• Chills, nausea or vomiting
• Nasal congestion and diarrhea

Most people (81%) develop mild or asymptomatic illness. However, 14% develop severe symptoms, and 5% experience critical illness (respiratory failure, septic shock, and/or multi-organ dysfunction).

Differences Between COVID-19 and Flu

Both COVID-19 and seasonal flu are respiratory diseases with similar symptom ranges. However, key differences exist:

• Severity distribution: 80% of COVID-19 infections are mild/asymptomatic, 15% are severe (requiring oxygen), and 5% are critical (requiring ventilation). The proportion of severe and critical infections is higher than influenza.
• Mortality rate: The crude mortality ratio for COVID-19 is between 3–4%, compared to well below 0.1% for seasonal flu.
• Transmission: COVID-19 has a higher basic reproduction number (R0) than seasonal influenza.

COVID-19 Fatality Rate by Age

Old age is one of the strongest risk factors for severe COVID-19 outcomes. Research shows that patients over 50 have a significantly higher risk of severe illness.

Age Group	Mortality Rate
80+ years	14.8%
70–79 years	8.0%
60–69 years	3.6%
50–59 years	1.3%
40–49 years	0.4%
10–39 years	0.2%
0–9 years	~0% (rare fatalities)

COVID-19 Fatality Rate by Sex

Data suggest that both sexes are equally likely to get infected, however men are more likely to die due to infection (death rate: 2.8% vs 1.7%). Possible explanations include:

• Differences in immune system responses
• Men are more likely to have pre-existing conditions (e.g., cardiovascular disease)
• Lower use of medical services
• Social and structural inequalities

COVID-19 Fatality Rate by Comorbidity

Patients with underlying health conditions face higher risk. Key comorbidities include:

• Cardiovascular disease — highest risk multiplier (~2.13×)
• Diabetes mellitus — significant risk increase (~1.49×)
• Chronic respiratory disease — moderate risk increase (~1.22×)
• Hypertension — moderate risk increase (~1.22×)
• Cancer — mild-to-moderate risk increase (~1.15×)

I Am in a Higher-Risk Group. What Now?

If you fall into a higher-risk category, here are recommended actions:

Cardiovascular Disease & Hypertension

• Take your medication exactly as prescribed
• Maintain at least a two-week supply of heart disease medications
• Monitor and control your blood pressure as directed

Diabetes

• Continue taking diabetes pills and/or insulin as usual
• Keep a two-week supply of medication
• Test blood sugar as ordered and follow sick day guidelines if ill

Chronic Respiratory Disease

• Continue medication as prescribed
• Ensure you know how to use inhalers correctly
• Avoid triggers that worsen symptoms

Older Adults (65+)

• Take medications for underlying conditions as prescribed
• Prepare to stay home for extended periods (food, medicine supply)
• Maintain a summary of current health conditions and treatment plan

Frequently Asked Questions

How accurate is this calculator?

This calculator uses published epidemiological data on COVID-19 fatality rates. However, individual outcomes depend on many factors not captured here, including vaccination status, viral variant, healthcare access, and overall health.

Does vaccination reduce my risk?

Yes, significantly. COVID-19 vaccines have been shown to dramatically reduce the risk of severe illness, hospitalization, and death. The risk estimates from this calculator are based on pre-vaccination data and may overestimate risk for vaccinated individuals.

Why are the comorbidity multipliers multiplicative?

Research suggests that having multiple conditions compounds risk. We use multiplicative factors because each condition independently increases the severity of COVID-19, and their combined effect is typically greater than additive.