About this sales tax calculator
Sales tax (called VAT or GST in many countries) is a percentage added to the price of goods and services. This calculator works two ways. In add tax mode you enter a pre-tax price and a rate, and it shows the tax and the final total — useful for quoting a customer or budgeting a purchase. In amount includes tax mode you enter a total that already has tax in it, and it works backwards to show the original price and how much of the total is tax — handy for receipts and bookkeeping. It works with any rate, including ones with decimals like 8.25%, and all the maths runs in your browser.
Frequently asked questions
- How do I add sales tax to a price?
- Enter the price and the tax rate in "add tax" mode. The tool multiplies the price by the rate and shows the tax and the new total.
- How do I find the tax inside a total?
- Switch to "amount already includes tax" mode. The tool works backwards to show the pre-tax price and the tax portion of the total.
- Does it work for VAT or GST?
- Yes. Sales tax, VAT and GST are all percentage-based, so enter your local rate and the calculation is the same.