When is the next vaccination? Work it out from the date of birth
Pick a date of birth and a country, and every appointment on the national schedule turns into an actual date. No sign-up, nothing to install, and it works for twelve countries — useful when the schedule you grew up with is not the one your child is on.
Pick a date of birth to see dates.
Dates are calculated from the date of birth against the published national schedule. Real appointments are booked by your health service and a delay rarely means starting over — check with your doctor.
What it is doing
Published immunisation schedules are written in ages: 8 weeks, 12 weeks, 1 year. That is fine for the leaflet on the clinic wall and useless at 11 p.m. when you are trying to work out whether you have missed something. The calculator does the only arithmetic that matters — it adds those ages to your child's date of birth — and marks what is behind you and what is next.
Which countries are covered
The United Kingdom, the United States, Canada, Australia, Spain, Germany, France, Italy, Portugal, Brazil and Mexico. Each schedule names the authority it came from, shown under the table, so you can check it rather than take our word for it.
The differences are bigger than most people expect. The UK gives the 6-in-1 at 8, 12 and 16 weeks; Spain gives its hexavalent at 2, 4 and 11 months. Germany starts rotavirus at six weeks, the UK at eight, and Brazil runs a schedule that includes BCG on day one and yellow fever at nine months. None of them is wrong — they are national answers to national disease patterns.
If your family moved countries
This is the case the calculator was built for. Doses already given still count: schedules are continued, not restarted. What the clinic needs from you is the dates, because the interval between doses matters more than the count. Switch the country selector to where you were, note what was due when, then switch to where you are now — and take both to the appointment.
What this is not
- Not a medical decision. It shows a published national schedule for a healthy child on time. Catch-up rules, medical exemptions and premature babies are a clinician's job.
- Not your appointment. Booking still happens through your health service.
- Not always current. Schedules are revised — the UK added an 18-month 6-in-1 booster for children born from July 2024. The source link under the table is always the authority; this page is not.
If you would rather have this alongside the rest of the day — sleep, feeds, growth percentiles, an illness guide — that is Rostik. The schedules and the illness guide are free there too.
Common questions
Is the calculator free?
Yes, and there is nothing to sign up for. It runs in your browser and the date of birth you type is not sent anywhere.
Why does it show weeks for some ages and months for others?
Because the schedules do. The UK writes its infant doses in weeks and Spain writes them in months; showing them any other way would quietly change the meaning.
My baby was premature. Do I use the corrected age?
For vaccination, chronological age is normally used rather than corrected age — that is the general rule in most national schedules. Confirm with your paediatric team, since preterm babies sometimes get extra doses.
A date has already passed and we missed it. What now?
Call the clinic and book. A late dose almost never means restarting the course; the schedule is resumed from where it stopped.
Sources
- NHS — vaccinations and when to have them
- GOV.UK — routine childhood immunisation schedule
- WHO — recommendations for routine immunization, summary tables
Rostik is a parental logging app, not a medical device. This page is general information, not medical advice — for concerns about your baby speak to your doctor or health visitor.