Work backward from the income you actually want, not a rate you guessed at.
Most freelancers price by guessing what feels reasonable, then wonder why they're not hitting their income goals. This calculator flips that: start with the income you actually need (including covering your own business expenses, since nobody else will), divide by the hours you can realistically bill — not your total working hours, since admin, marketing, and client calls eat into that — and the math tells you the number, rather than your gut.
Most freelancers overestimate how many hours per week are truly billable. If you work 40 hours a week, 20-25 billable hours is a more realistic number once you account for invoicing, prospecting, and admin work.