Is there a site you can look up transportation rates?
On Lyft you can put in the trip and it will show you the cost of the trip before asking you to request the ride. I think you can do that for Uber as well. For Taxi you would have to discuss it with the driver I believe.
Here is the Mears estimator (taxi)
Here is Uber estimator.
Here is the Lyft estimator.
Will estimate a taxi fare.
This info may also help you: