Calculators for the numbers on an invoice
Four things worth getting right before the invoice goes out: the tax, your rate, what a late payer owes you, and whether the job made money. Free, no sign-up, and everything runs in your browser.
VAT & GST calculator
Add tax to a net figure, or work backwards from a gross one.
Hourly rate calculator
Work out what to charge per hour from what you need to earn.
Late payment interest calculator
Work out the interest owed on an invoice that has gone past its due date.
Markup & margin calculator
Convert between cost, sell price, markup and margin — in either direction.
Desktop invoicing software
The calculators are free and always will be. If you send invoices regularly, Paidlio creates them, runs recurring billing on a schedule, and produces customer statements as PDFs — on your own machine, with the database on your disk.
Pay once and own it. $79 USD, with native builds for Windows and Linux.