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About this tool
Work out whether an HPV series needs two or three doses from the age at dose one, with recommended dates and minimum intervals.
The number of HPV vaccine doses depends on one thing: whether the series was started before the 15th birthday. Started earlier, it is a 2-dose schedule at 0 and 6-12 months with a minimum 5-month gap; started at 15 or later, or in anyone immunocompromised, it is a 3-dose schedule at 0, 1-2 and 6 months. This planner applies the ACIP interval rules to a date of birth and a first-dose date, and returns each appointment date alongside the earliest date that dose can validly be given.
Open HPV Vaccine Schedule Planner on AltFTool — it loads instantly in your browser.
Enter the Date of birth and the First dose date (planned or given); optionally add 'Second dose date, if already given' and tick the immunocompromising-condition checkbox, which forces a 3-dose series at any age.
The planner applies the age-15 rule automatically: Doses needed shows 2 or 3 with why that schedule applies, and the dose table lists each Date, its Not before column and days After dose 1.
Press Copy schedule to copy the whole plan — each dose's date, the earliest it may validly be given and the series-complete date — as text for the clinic visit.
Picks the 2-dose or 3-dose schedule automatically from the date of birth.
Every dose lists its earliest valid date, not just the ideal one.
Flags when an early second dose converts a 2-dose series into a 3-dose one.
Two if the first dose was given before your 15th birthday, three if it was given at 15 or older. Anyone with an immunocompromising condition, including HIV infection, gets three doses whatever their age at the first dose.
On the 2-dose schedule the second dose comes 6 to 12 months after the first, with a minimum interval of 5 months. On the 3-dose schedule the doses fall at 0, 1-2 and 6 months, with minimum intervals of 4 weeks between doses 1 and 2, 12 weeks between doses 2 and 3, and 5 months between doses 1 and 3.
The series is resumed, not restarted — earlier doses still count no matter how long the delay. There is no maximum interval that invalidates a dose, so a second dose two years late still completes a 2-dose series.
Yes, it is licensed through age 45, but for adults aged 27 to 45 it is a shared clinical decision rather than a routine recommendation, because many people have already been exposed to the common HPV types by then. Discuss the likely benefit with your doctor.