You will never get the exact answer you want because the exact number of flipped votes is intrinsically immeasurable. I'll do my best to provide some tangible examples though.
Facebook has admitted that Russian propaganda in some shape or form reached as many as 126 million users. The power of Facebook ad-targeting combined with relatively low cost made their social media efforts extraordinarily effective. That doesn't mean they changed 126 million minds, half of those people probably scrolled right past whatever propaganda made it onto their screen. However, I think it's reasonable to suggest that perhaps just 1-3% of those people may have been sitting on the fence and could be potentially swayed one way or the other. That is hypothetically as many as a few million votes right there.
Russians, according to the intelligence agencies, were also responsible for hacking the DNC, giving rise to Pizzagate, along with a slow-drip of damaging information about Hillary and her associates all the way until election day (I hate Hillary btw, just telling the truth). These hacks ultimately gave rise to the FBI reopening the email investigation less than 2 weeks before the election. This alone may be what have tipped the scales into Trump's favor at exactly the right time.
Trump may not have spent as much money as Hillary, but the amount of free press he was able to generate with his rhetoric and behavior was also valued in the billions. He, to his credit, essentially figured out a way to game the system.
@ jews making an accounting mistake
