What the calculation measures
Freelancers spend time on sales, admin and learning that cannot always be billed. Utilization keeps that reality in the rate calculation.
How to interpret the result
Use a reserve assumption for taxes/benefits rather than treating gross revenue as take-home income.
Run scenarios instead of one answer
Change the most uncertain input and compare outcomes. A calculator is most useful when it shows sensitivity, not when one estimate is treated as a guarantee.
Limits and assumptions
Market positioning, value pricing and project risk can justify rates above the modeled minimum.