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Immunisation Catch Up Schedule Calculator

Work out immunisation catch up schedule instantly with clear inputs, formula shown and shareable results.

About Immunisation Catch Up Schedule Calculator

Works out how many doses remain in an interrupted vaccine course and how long completion takes at the minimum interval.

Formula

Catch-up timing

Doses remaining = required - received; weeks to complete = (doses remaining - 1) x minimum interval, starting today

Worked example

With the default values below, Immunisation Catch Up Schedule Calculator returns Doses still needed of 2. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current ageaccepts 1–216 months
18 months
Doses already givenaccepts 0–6
1
Doses required in the courseaccepts 1–6
3
Minimum interval between dosesaccepts 2–26 weeks
4 weeks

Results

Doses still needed
2
Weeks to finish the course
4 weeks
Age at completion
18.9 months
Plan
Start today and keep the minimum interval between each remaining dose

Step by step

  1. 1Values used
  2. 2Catch-up timing
  3. 3Doses still needed= 2
  4. 4Weeks to finish the course= 4 weeks
  5. 5Age at completion= 18.9 months
  6. 6Plan= Start today and keep the minimum interval between each remaining dose

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Do interrupted courses restart?

No. Catch-up schedules resume where the course stopped, keeping only the minimum intervals.

Do intervals shorten in catch-up?

Accelerated minimum intervals are permitted in catch-up but never shorter than the licensed minimum.

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