Health insurance, retirement contributions, and paid time off are broken out separately, since lumping them into one guessed "benefits" number usually hides the single biggest cost freelancers underestimate: health insurance.
Employer-sponsored health insurance is often the single largest hidden cost freelancers underestimate when comparing pay. The default figures here reflect real national averages, employers contribute roughly $7,900 a year toward single coverage on average, while an unsubsidized ACA marketplace benchmark plan runs about $6,000 a year nationally, though both vary significantly by age, location, and specific plan. Adjust either number if you know your actual figures.
Beyond the dollar figures, a job typically comes with unemployment insurance if you lose it, and often short and long-term disability coverage. Freelancing generally does not include either by default. These matter for risk, not just take-home pay, and are worth weighing alongside the numbers above, not instead of them.
If you're leaning toward freelancing, the true rate calculator can help you sanity-check whether the hourly rate you used here is realistic for your experience level and market.