Invoice calculator
Add your line items to get the subtotal, tax and total, then turn them into an invoice.
Calculation summary
Calculated live2 lines
Total = sum of quantity × price, plus tax on each line.
Instant breakdown
Every figure is shown line by line, rounded to two decimals, so you can copy it straight onto an invoice.
Formula you can check
The formula and a worked example sit below the tool, so you can verify the result yourself.
100% client-side and private
The numbers stay in your browser. Nothing is stored or sent to a server.
Turn this into an invoice
Create and download a professional invoice from plain text. Free, no signup.
Create an invoiceHow to calculate an invoice
An invoice total is the sum of every line, quantity times unit price, plus tax. Showing the subtotal and tax separately makes the invoice easy for the client to check.
Rounding to two decimals per invoice keeps the total consistent with what you report in your books.
Common questions
Clear answers on contract law, calculations and enforcement.
How do you calculate an invoice total?
Multiply quantity by unit price for each line, add the lines for the subtotal, then add tax.
How is tax added to an invoice?
Multiply each line by its tax rate and add it, or apply one rate to the subtotal if all lines share it.
Can lines have different tax rates?
Yes. Set the rate on each line and the tax is added per line.
Can I create the invoice from these numbers?
Yes. Use the button to start an invoice, or describe the lines in text and let the generator build it.