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Sentinel Surveillance Coverage Calculator

Work out sentinel surveillance coverage instantly with clear inputs, formula shown and shareable results.

About Sentinel Surveillance Coverage Calculator

Reports what share of facilities and population a sentinel surveillance network covers, and how many sites full coverage would need.

Formula

Surveillance coverage

Population coverage (%) = population in sentinel catchments / total population x 100; facility coverage = sentinel sites / total facilities x 100

Worked example

With the default values below, Sentinel Surveillance Coverage Calculator returns Population coverage of 15.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Sentinel sitesaccepts 1–10,000
25
Total facilitiesaccepts 1–100,000
400
Population in sentinel catchmentsaccepts 1–1,000,000,000
300,000
Total populationaccepts 1–2,000,000,000
2,000,000

Results

Population coverage
15.000%
Facility coverage
6.250%
Population per sentinel site
12,000
Sites needed for full population coverage
166.7

Step by step

  1. 1Values used
  2. 2Surveillance coverage
  3. 3Population coverage= 15.000
  4. 4Facility coverage= 6.250
  5. 5Population per sentinel site= 12,000
  6. 6Sites needed for full population coverage= 166.7

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 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

Does sentinel surveillance need to be representative?

It needs to be consistent over time for trend detection; representativeness matters more for estimating burden.

Why not use every facility?

Sentinel sites allow higher data quality and laboratory confirmation at affordable cost.

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