Studies of VAERS have estimated that only from 1% to 10% of adverse vaccine side effects will ever get reported.
For a better estimate, I would triple the reported numbers shown below to add unreported side effects, and delete reported side effects that may just be coincidences, not caused by the vaccines.
Every other estimate I've read is higher than mine.
For my estimate of the actual number of side effects, I multiply the numbers above by 10, assuming only 10% are reported, and then I assume two thirds of serious injuries are coincidences. (The COVID Liars want people to believe these reports are all coincidences, making their beloved COVID shots a leading cause of coincidences.)
The result is that I multiply the reported numbers by 3.3x. I believe my common sense adjustment will provide a decent estimate of reality, KNOWING under reporting is almost certain. Ignoring all VAERS data because they are incomplete makes no sense.