Free Invoice Generator

Invoice calculator

Enter your lines and this works out the subtotal, the discount, the tax, the total and what is still owed. The arithmetic runs in your browser and nothing is stored.

Currency
Line items

Discount, tax and other charges

GuideHow an invoice total is worked outHow this works, and where the figures go wrong →

What the invoice calculator does not do

  • It does not keep anything. Nothing is written to your browser's storage while you use it and nothing is sent to us, so the figures are gone when you close the tab. Press Create this invoice if you need a document: the figures are handed to the invoice generator in this tab, cleared as soon as it opens, and saved there as a new invoice alongside any you already have.
  • It does not know your tax rate, and it does not check whether you are required to charge tax at all. It applies the rate you type.
  • It applies one tax rate to the whole invoice. A line-by-line rate, which is what a mixed-rate invoice needs, is not supported here.
  • It isn't tax advice. It does the arithmetic, and you're responsible for the numbers you enter.

Related

Billing time rather than a quantity of something? The hourly invoice calculator takes hours and an hourly rate, and keeps expenses in a section of their own. For one amount and one rate, the VAT calculator also works backwards from a total that already includes the tax, and the sales tax calculator does the same over a combined state, county and city rate. For what is left of the total once the payment processor has taken its share, the payment fee calculator works in both directions.

Once the figures are settled, the invoice due date calculator works out the day the money is due, whether that's Net 30, a count of working days or a date counted from the end of the month. Once that day has passed, the late payment fee calculator takes over.

A discount here comes off for everyone, whenever they pay. For one that applies only if the invoice is paid early, which works differently and has a cost of its own, use the early payment discount calculator.

Last updated 18 September 2026