Work out vaccine wastage rate instantly with clear inputs, formula shown and shareable results.
Divides unused doses by doses issued to give the wastage rate, and converts it into the multiplier used when forecasting vaccine requirements.
Wastage rate and factor
Wastage rate (%) = (issued - administered) / issued x 100; wastage factor = issued / administered = 1 / (1 - wastage rate)
Orders must cover doses that will be discarded, so the target population is multiplied by the factor.
Open-vial wastage in small sessions, cold chain breaches, expiry and breakage.