As an accountant I get asked "can you tell me the price I should be charging for my services?" and my short answer is no.
I can calculate the direct costs required to offer the service. I can tell you how much you're spending on overhead, and I can even give you multiple ways to assign those overhead costs to your services. None of which is overly helpful in determining a price for you're services.
Don't get me wrong, it's a good thing to know so you can be sure you're covering your costs with the prices you do set. But I don't recommend using it as the number one consideration.