Immunisation Dropout Rate Calculator

Work out immunisation dropout rate instantly with clear inputs, formula shown and shareable results.

About Immunisation Dropout Rate Calculator

Compares first and final dose numbers to give the dropout rate, the standard indicator of whether children who start a vaccine series finish it.

Formula

Dropout rate

Dropout (%) = (first dose - final dose) / first dose x 100

Worked example

With the default values below, Immunisation Dropout Rate Calculator returns Dropout rate of 12.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Children receiving the first doseaccepts 1–10,000,000: 1,000
Children receiving the final doseaccepts 0–10,000,000: 880

Results

Dropout rate: 12.000%
Series completion rate: 88.000%
Children lost between doses: 120
Assessment: Above the 10% threshold — investigate service utilisation

Step by step

1Values used
2Dropout rate
3Dropout rate= 12.000
4Series completion rate= 88.000
5Children lost between doses= 120
6Assessment= Above the 10% threshold — investigate service utilisation

Assumptions and limits

The result is derived only from the 2 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 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

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

Frequently Asked Questions

What dropout is acceptable?

Under 10% is the usual programme benchmark; higher values indicate access or defaulter-tracing problems.

Can dropout be negative?

Yes, if children who received the first dose elsewhere are counted for the final dose, which signals data quality problems.