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Invoice Total Calculator
Line items, discount and tax, totalled in the right order.
Invoice Total Calculator tool
Description, quantity, unit price.
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Invoice total
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Subtotal
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Discount
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Tax
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Line items
| Description | Quantity | Unit price | Line total |
|---|
Discount is applied before tax, which is the normal order and the one tax authorities expect: tax is charged on what the customer actually pays, not on the list price.
About the Invoice Total Calculator
Invoice Total Calculator takes a list of line items and produces the figures an invoice needs: subtotal, discount, shipping, tax and total. Each line is a description, a quantity and a unit price, so the line totals are worked out rather than typed, which is where arithmetic errors on invoices usually come from.
The order of operations matters and is fixed deliberately. Discount comes off the subtotal first, then tax is charged on the discounted amount. That is the normal commercial order and the one tax authorities expect, because tax is due on what the customer actually pays. Taxing first and discounting afterwards produces a different, generally incorrect, total.
Whether shipping is taxable is a genuine variable rather than a detail, so it is a checkbox. In many jurisdictions delivery charges attract the same rate as the goods; in some they do not. The summary box gives the whole breakdown in a form you can paste straight into an invoice or an email.
This is arithmetic, not financial advice. It tells you what the numbers do; it cannot tell you whether a decision is right for your circumstances. Fees, taxes and local rules vary, so check anything that matters against the actual offer and speak to someone qualified before committing.
Everything is worked out inside your browser. Nothing you enter is uploaded, logged or stored, which matters for the financial calculators in particular: the figures you put into them are nobody else's business.
Looking for something this does not cover? FreeToolsZone.org is more free browser-based tools, organised by job, and it is worth a look if invoice total calculator is only part of what you are working on.
How to use the Invoice Total Calculator
- Enter discount (%), tax rate (%) and shipping or deliveryDecimals are fine, and thousands separators are accepted and ignored.
- Read the invoice total, subtotal and discountThe figures update as you type. The Calculate button is there if you would rather press something, but nothing waits for it.
- Copy or check the resultCopy the summary with the copy button, or open the table to check it row by row and read the formula with your own numbers in it. The download button saves it as a file.
Features
- Shows invoice total, subtotal, discount, tax and line items together, so you are not running it twice
- A results table you can read across
- Prints the formula with your own figures substituted in
- Updates as you type, with no button to press and no page reload
- Copy the result in one click
- Download the detail as a .csv for a spreadsheet
- Free, no sign-up, and it runs entirely in your browser
Who uses this tool
The invoice total calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:
- Totalling a freelance invoice with several lines
- Working out a quote with a discount and tax
- Checking a supplier invoice for arithmetic errors
- Producing a breakdown to paste into an email
Frequently asked questions
Should discount come before or after tax?
Before. Tax is charged on the amount the customer pays, so the discount is applied to the subtotal first.
Is shipping taxable?
It depends on the jurisdiction and sometimes on what is being shipped. The checkbox lets you set it either way.
Can I add a credit or a negative line?
Enter a separate line with a negative unit price. The calculator refuses negative quantities, which are almost always a typing error.
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Checked and rebuilt on 2026-10-14. The method this calculator uses is described in the section above, and corrections go through the contact page.