If it does raise that much (and let's be honest - it almost certainly will), Uber will be valued at $50bn, setting it on a course to become the most valuable privately-funded business in history.
It says a lot that even when Facebook was at its pre-IPO strongest, it was only valued at $50bn.
Just to put that value into perspective, here's a chart showing just how much its valuation has leaped, as private equity firms have become increasingly competitive about getting in on its funding rounds. Not bad, for a company which still classes itself as a "startup"...
NB. This data misses out Uber's first four funding rounds, for which we have no valuation data.