Uber has a fare estimator:
https://www.uber.com/fare-estimate/ However, note that the actual cost of your Uber ride may depend on time of day, as traffic and surge pricing could raise the price substantially. Traffic over the Bay Bridge is no joke, but the views of the City's skyline are gorgeous.
Alternatively, you could take BART from OAK to Embarcadero Station in SF. Embarcadero Station is literally right in front of the Hyatt Regency (it'll be a bit more of a haul from there up to Hyatt Centric at Fisherman's Wharf):
https://bartable.bart.gov/featured/oakland-airport-now-bartable It's about a 35-40 minute ride and costs $10.95 per rider. I've read that BART has an app that's available on the iTunes App and Google Play stores, which offers a 25% discount for groups of two or more. However, BART doesn’t have scanners at its stations for people using the app, so you'll need to show the ticket on your phone to a station agent.