How the calculator works
It adds your take-home goal, your business costs and the tax you need to set aside, then divides by the hours you can actually bill. Most freelancers bill well under 100% of their working time: pitching, admin, invoicing and research take hours you can't charge for, which is why the billable share matters so much.
The result is your floor, not your price. Charge more for specialist topics, rush jobs, extensive research or clients who need lots of revisions. Read more in how much to charge for writing.
Tax rates vary a lot by country and situation. The tax percentage here is only a set-aside estimate; check with a tax professional or your tax authority.