RateFloor separates two jobs. First it reduces the working year to the hours clients can actually buy. Then it expands the desired take-home amount into the gross revenue required after fixed costs and percentage allowances.
The order matters. Tax and variable overhead are defined as shares of gross revenue, so the model divides by the percentage that remains. Adding a markup to the target would not preserve the target after those shares are removed.
The exact hourly floor is required gross revenue divided by annual billable hours. The recommendation rounds upward to a whole dollar. A day quote uses the full standard workday because utilization has already been absorbed into the hourly floor.
This page gives the quick answer. The open methodology provides three reproducible validation cases, boundary behavior, the BLS mapping process, and the editorial correction policy.