Work a Catch-Up Vaccine Schedule Back From the Day You Need Protection — Free
Catch-up schedules fail in one specific way: the last dose is booked first because it is the one anyone remembers, and the dose that needed 28 days of lead time is discovered at the appointment. This docket takes the protection date and each dose's minimum interval, counts every one back, and files them in the order the deadlines actually arrive — with the tightest dose named at the top.
The proof surface
Free path: the docket computes locally in the browser with no key and no account. Where an AI step helps, any free chat assistant works — Google AI Studio's free tier and Groq's free tier were both no-card and rate-limited when this page was reviewed on 2026-09-13 (limits change; check before you rely on them).
Why the flat version breaks
A clinic leaflet lists intervals in clinical order (dose 1, dose 2, dose 3) with no dates attached, so the arithmetic is left to you at the desk. Counting the same intervals back from one fixed date turns a list of intervals into a diary of start-by dates, and shows immediately when the schedule no longer fits.
How to use the immunisation catch-up docket in four passes
For travel that is usually departure, but some entry rules count from the day the certificate becomes valid — ten days after a yellow fever dose is the common rule. Use the date the clinic gave you, not the flight date, if they differ.
The interval is the shortest time the product or the schedule allows before protection counts, not the gap you would prefer. Boosters that need 28 or 56 days after an earlier dose are the ones that break a short-notice plan.
Rows are filed by start-by date, so the first line is the dose with the least room. If that date is already in the past, the schedule does not fit and the conversation with the clinic is about acceleration or a different product.
Doses slip, products go out of stock, and a clinic may substitute an equivalent. Change the interval or the anchor and re-file — a docket dated last month is worse than none, because it looks current.
SAMPLE DATA, NOT A VERIFIED CLAIM: Northside Travel Clinic · protection needed 18 Jan 2027 · rabies dose 1 needs 28 days · yellow fever 10 · cholera course 21 · booster same day. Replace these values with your own source before you rely on anything.
What breaks first
Using intervals you found in a forum
Minimum intervals are product-specific and they change. Take the numbers from the clinic, the patient information leaflet, or the national schedule — the docket only does the arithmetic on whatever you type.
Assuming one appointment covers everything
Some doses cannot be given on the same day as others, and some clinics will not co-administer at all. The docket shows dates, not booking feasibility; ask the clinic which rows can share one visit.
Treating a start-by date as a certificate date
Protection and paperwork are different things. An entry rule may need the certificate itself, and the docket cannot produce one — it only tells you when the dose has to happen for the date to work.
What you pay otherwise
| The usual route | What it leaves out | Cost |
|---|---|---|
| A private travel clinic's own schedule sheet | Dates worked out at the appointment, often after a deposit | consultation fee before the plan exists |
| Working the intervals out by hand | One missed 28-day interval and the whole trip is exposed | a rebooked appointment |
| A paid trip-planning app with a vaccine module | Generic intervals, your data on their servers | subscription |
| This page + the free immunisation catch-up docket | Computed in your tab, result on screen before you type anything | $0 |
Try the free immunisation catch-up docket
Seven doses are already filed against 18 Jan 2027, with the 28-day rabies dose at the top of the docket and its start-by date printed beside it. Move the protection date to December and the tightest row goes past today.
Open the free immunisation catch-up docket →Keep the work if you will use it again
Every dose, every counted-back date and the tightest-interval flag, plus copy and share-link, with no account.
The on-screen result is free and repeatable forever. The one-time tier adds a tangible file you keep and the saved history that comes with it; it never removes or degrades the free result.
Boundary: This does date arithmetic on the intervals you type in; it is not medical advice, it does not know which doses you have already had, and it cannot confirm entry rules, product availability or whether doses can be co-administered. Confirm every interval and date with your clinic or national immunisation schedule.