Flu Susceptibility Score Calculator

Example data table

Formula used

• Total Points = AgePoints + VaccinationPoints + (ChronicCount × 4) + ExposurePoints + WorkplacePoints + KidsPoints + TravelPoints + HygienePoints + SleepPoints + StressPoints + SmokingPoints + BMIPoints + ImmunoPoints
• Score = min(100, max(0, round(Total Points)))
• Risk Band: Low (<30), Moderate (30–59), High (60–79), Very High (80–100)

How to use this calculator

1. Enter age and seasonal vaccination status.
2. Add exposure details, workplace setting, and household context.
3. Include habits like hand hygiene, sleep, stress, and smoking.
4. Click Calculate Score to view your score above the form.
5. Use the CSV or PDF buttons to download your results.
6. Adjust one factor at a time to compare scenarios.

Seasonality and community spread patterns

Flu activity tends to rise in waves during cooler months, with higher attack rates when indoor crowding increases and ventilation drops. The calculator’s exposure and workplace fields approximate how often you share air with many people. High-contact roles and frequent public transport can move a user from Moderate to High even when other habits are stable. Living with school-age children can also increase contact networks.

Vaccination status as a risk modifier

Seasonal vaccination is treated as the strongest adjustable factor because it reduces the chance of infection and may lessen severity if infection occurs. Selecting “No” adds a larger point increase than most other single inputs. If status is unknown, a smaller penalty is applied to reflect uncertainty and encourage record checking. The model assumes vaccine benefit is additive, so it can partly offset high exposure.

Chronic conditions and immune resilience

Each chronic condition adds incremental points to represent higher vulnerability and slower recovery. Examples include asthma, diabetes, heart disease, kidney disease, or chronic lung disease. The model scales this by count rather than diagnosis type to keep inputs simple. Immunocompromised status adds a separate block of points because it can affect antibody response and viral clearance. When condition counts are higher, small behavior improvements can still reduce the final score.

Behavioral levers: sleep, hygiene, and smoking

Sleep below seven hours increases points, reflecting reduced restorative time and higher illness susceptibility observed in population studies. Hand hygiene contributes a clear, modifiable offset: “Good” adds zero points, while “Poor” increases risk. Smoking raises points because airway irritation can worsen respiratory infections and prolong symptoms. Stress level is included as a practical proxy for routines; sustained high stress often correlates with poorer sleep and fewer preventive behaviors.

Interpreting the 0–100 score for decisions

Scores are capped to a 0–100 band for comparison, not to predict exact probability. Use the tool to run “what-if” scenarios: change one input at a time and watch the band shift. If you land in High or Very High, the guidance section emphasizes layered prevention, early symptom monitoring, and reducing high-exposure activities. Pair the score with advisories and your clinician’s guidance when needed.

FAQs

1) Is this score a medical diagnosis?

No. It is an educational comparison tool that summarizes self-reported factors into a 0–100 score. It cannot confirm infection risk or severity for an individual. For medical advice or symptoms, consult a qualified clinician.

2) Why does vaccination change the score so much?

Vaccination is a major preventive lever and can reduce the chance of infection and complications. The calculator assigns higher points when you are unvaccinated to reflect avoidable exposure. It still considers other risks like high-contact work.

3) What counts as a chronic condition here?

Use the count of ongoing conditions that affect overall health, such as asthma, diabetes, heart disease, kidney disease, or chronic lung disease. The tool uses the number of conditions, not their type, to keep the model simple.

4) How should I choose my exposure level?

Low fits mostly private settings and minimal crowd contact. Medium matches routine errands, shared offices, or occasional transit. High fits daily crowded indoor contact, frequent public transport, or ongoing close contact with many people.

5) Can I use the score to compare scenarios?

Yes. Change one input at a time—such as sleep, hygiene, or exposure—to see how the band shifts. This is a practical way to identify the highest-impact adjustments for your routine during peak flu activity.

6) When should I seek help if I feel sick?

If you have severe symptoms, breathing difficulty, chest pain, dehydration, or you are at higher risk due to age, chronic illness, or immunocompromise, seek care promptly. Follow local guidance and your clinician’s instructions.