Vaccine Schedule Age Calculator

Vaccination schedules are developed by public health authorities to ensure people receive immunity at the optimal age — when they are most vulnerable to a disease, when the vaccine is most effective, and before natural exposure occurs. Schedules are reviewed and updated regularly based on new research and disease patterns.

How Vaccination Schedules Work

Vaccines work by training your immune system to recognize and fight specific pathogens. Some vaccines require multiple doses to build full immunity (primary series), while others need periodic boosters to maintain protection as immunity wanes over time.

Children’s Schedule (Birth to 18 Years)

Children receive the most vaccines early in life because their immune systems are still developing and they are most vulnerable to many diseases. Core childhood vaccines include:

• Birth: Hepatitis B (first dose)
• 2 months: DTaP, Hib, IPV, PCV15/20, RV, Hepatitis B (2nd dose)
• 4 months: DTaP, Hib, IPV, PCV, RV
• 6 months: DTaP, Hib, IPV, PCV, RV, Influenza (annual from here)
• 12–15 months: MMR, Varicella, Hepatitis A, Hib, PCV booster
• 4–6 years: DTaP, IPV, MMR, Varicella boosters
• 11–12 years: Tdap, HPV series, Meningococcal ACWY
• 16 years: Meningococcal booster

Adult Schedule

Adults also need vaccines — either because childhood immunity has waned, they missed doses, or new vaccines became available:

• Annual: Influenza
• Every 10 years: Tdap/Td (tetanus-diphtheria-pertussis)
• Once or series: Hepatitis A & B if not previously vaccinated
• 50+: Shingles (Shingrix) — 2-dose series
• 60+: RSV vaccine
• 65+: Pneumococcal (PPSV23 or PCV20)
• Pregnant women: Tdap each pregnancy, RSV, and influenza

This Calculator

Enter your age and status to see which vaccines are commonly recommended. Always verify with your healthcare provider or local health authority, as schedules vary by country, medical history, and individual risk factors.