How much is a personal trainer?
I agree with Jousha & Joanna’s answers .
It depends on the Credentials,Experience, Track record (Client base), Media Exposure, Location,how famous you are nationally & internationally in your market segment.
When you do have a client base focus on the are you are most passionate about eg: Fat loss/Toning/Kids/Pro-Athletes/Post-Rehab stick with them, eventually you will be well know within that circle. Then you can have your own bench mark