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Yes. It's completely free to use, with no limits and no signup required.
No. The calculation runs entirely in your browser. Your income, expenses and rate never leave your device.
It takes your desired annual income plus annual business expenses, grosses that up for your tax set-aside percentage, then divides by your billable hours per year (billable hours/week × weeks worked). The day rate is the hourly rate × 8.
Yes. You enter weeks off per year and billable hours per week, so time spent on admin, sales, holidays and sick days is factored out of the rate automatically.