HPV Vaccine Dose Planner

It depends on how old you were at your first dose and your immune status. If you start the series before your 15th birthday and aren't immunocompromised, you need just 2 doses, given 6 to 12 months apart. If you start at 15 or older, you need 3 doses, given over about 6 months. People with a weakened immune system need 3 doses regardless of the age they start. This tool applies those rules to what you tell it. One important detail: for the 2-dose schedule, the doses must be at least 5 months apart — if the second came sooner, a third dose is recommended.

The CDC recommends routine HPV vaccination at ages 11–12 (it can start at 9), and catch-up vaccination for everyone through age 26 who isn't already vaccinated. For adults aged 27 through 45, HPV vaccination isn't routinely recommended for everyone, but some may still benefit — that's a decision to make with a clinician (called shared clinical decision-making), and it uses the 3-dose schedule. The vaccine protects best when given before any exposure to HPV, which is why the routine age is early.

For the 2-dose schedule (started before age 15), the second dose comes 6 to 12 months after the first, and they must be at least 5 months apart. For the 3-dose schedule (started at 15 or older, or for immunocompromised people), the doses are given at 0, 1–2 months, and 6 months. The minimum intervals are 4 weeks between the first and second dose, 12 weeks between the second and third, and at least 5 months between the first and third dose. Giving a dose too early means it may need to be repeated.

No. If your HPV vaccine series was interrupted, you do not need to restart it — you simply pick up where you left off and complete the remaining doses. There's no maximum interval after which you'd have to begin again. So if you had one or two doses years ago, you generally just need the remaining dose(s) to be fully protected, using the same total number for your age at first dose. A clinician can confirm your records and give the rest.

No. The HPV vaccine dramatically lowers the risk of the HPV types that cause most cervical and other HPV-related cancers, but it doesn't cover every high-risk type, and it works best before exposure. So people with a cervix should still follow routine cervical cancer screening (Pap and/or HPV testing) on the recommended schedule even if fully vaccinated. Vaccination and screening work together — one prevents most infections, the other catches changes early.

Yes. This tool runs entirely in your browser. Your answers are used on your own device and are never sent to a server, saved, or shared — close the tab and they're gone. It's general educational information based on the CDC/ACIP schedule; it isn't medical advice and can't replace your immunization records or a clinician.