Work out test positivity rate instantly with clear inputs, formula shown and shareable results.
Divides positive tests by tests performed, the surveillance indicator used to judge whether testing keeps pace with transmission.
Test positivity
Positivity (%) = positive tests / total tests x 100; WHO suggested a benchmark of 5% or below
It adjusts for testing volume, so a rising positivity rate signals genuinely rising transmission rather than more testing.
Asymptomatic screening dilutes the rate, so many systems report symptomatic and screening positivity separately.