Car Accident - need opinion?

I was in an accident while in a cab a year and a half ago. I was riding in the front (the back was filled) and the cab driver rear ended someone. I took an ambulance to the hospital and ended up having 2 surgeries later in the year due to it. My medical bills are appx $55,000. I do have a lawyer - but my question is...how much should I ask for? Is there a general "calculator" that would officiate a quote? Is it 4 times as much? 3?