Turbo Tax will calculate taxes/refunds based on the info you enter. Like you, I wanted to get an idea of what I would be looking at this season so I entered a bunch of approximate values to get an idea. Just start a return, import your data from last year if you have any, and plug away.
If you're a W2 employee, then you can get a good idea of what to enter off of your final pay stub of 2022. If you're self employed like me, then you should have good records that you can reference.
