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About this tool
Work out the earliest date you become eligible for a COVID booster from your last dose, any recent infection and the interval rule you follow.
Booster timing comes down to one comparison: the minimum gap since your last COVID-19 vaccine dose versus the deferral period after a recent infection, whichever falls later. This planner takes both dates, applies the interval rule you select — 2 months since a dose and 3 months after infection, a 3-month programme rule, or a 6-month seasonal spacing — and returns the earliest eligible date with a countdown. Intervals are inputs rather than fixed values because national guidance differs and changes.
Open COVID Booster Interval Planner on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Shows the dose-interval date and the post-infection date, and tells you which one governs.
Presets for the common 2-month, 3-month and 6-month rules, plus custom day counts.
Reports days remaining, or how long you have already been eligible.
Guidance commonly suggests considering a delay of about 3 months from symptom onset or a positive test, because recent infection provides short-term protection. It is a recommendation rather than a hard contraindication, so ask your clinician if you are at high risk or in an outbreak.
For most people the commonly published minimum for an additional updated dose is 2 months (about 56 days) since the previous COVID-19 vaccine, while seasonal programmes in many countries space doses about 6 months apart for eligible groups. Check the interval your own health service is using.
The later of the two. If your last dose was 1 January with a 56-day interval and you were infected on 1 February with a 90-day deferral, the dose rule clears on 26 February but the infection rule clears on 2 May — so 2 May is the earliest date.
Not always — additional doses are often offered on a shorter schedule and without the post-infection wait, and the number of doses can differ. This is a case where the specialist looking after your condition should set the schedule rather than a general rule.