A UK-wide vaccine calculator estimated when you might receive both doses of your vaccine. Omni, the online calculator, helps people find out roughly how long they will have to wait to get a jab. The calculator was first launched after the Pfizer/BioNTech jab was approved. Users of the calculator are asked to enter their age and notify the system of certain factors such as if they are a health worker or if they have any underlying health conditions. Omni’s calculator will then give the user a national number as to where they stand in terms of vaccine priority.