Who this is for
Service pricing hides its costs inside the calendar. A $6,500 monthly package that 'takes about 30 hours' usually consumes 45 once meetings, revisions, email, and project management are counted, and the margin difference between those two numbers is the difference between a business and a grind. Honest delivery-hour counting comes before any pricing math.
Track or estimate the true hours per engagement, multiply by loaded labor cost, add direct expenses, and enter the result as cost of goods sold against the engagement's revenue. The calculator returns the real margin; the guidance below covers the overhead loading and scope-creep effects that erode it after launch.