Add or remove sales tax in seconds. This free sales tax calculator shows the tax and total on any price, and can also work backward from a tax-included total to the original price.
Results update automatically as you type. “Remove tax” extracts the tax from a tax-inclusive total.
Use this free sales tax calculator to add sales tax to a price or work backward from a tax-included total. Enter the amount and your tax rate to see the tax and the final total instantly.
A sales tax calculator works out the tax on a purchase and your total price. In Add tax mode it adds tax to a pre-tax amount; in Remove tax mode it extracts the tax from a tax-inclusive total to show the original price. Either way you get the subtotal, tax amount and total.
Sales tax = Price × (Tax rate ÷ 100) · Total = Price + Sales tax
For a $100 purchase at a 7.5% rate: $100 × 0.075 = $7.50 tax, for a $107.50 total. To work backward from a $107.50 tax-inclusive total, divide by 1.075 to get the $100 pre-tax price.
Sales tax is a percentage added to the price of goods and services at checkout. Rates vary widely by location — in the US they’re set by state, county and city, so the combined rate differs from one town to the next. Some countries use VAT or GST instead, which works similarly but is often already included in the displayed price.
| Term | What it means |
|---|---|
| Sales tax | A percentage added to a purchase price at checkout. |
| Subtotal | The price before tax is applied. |
| Tax-inclusive | A price that already has tax built in. |
| Combined rate | State plus local rates added together. |
| VAT / GST | Value-added or goods-and-services tax used in many countries. |
Multiply the price by the tax rate as a decimal. For a $100 purchase at 7.5%, the tax is $100 × 0.075 = $7.50, for a $107.50 total.
Divide the tax-inclusive total by (1 + rate ÷ 100). A $107.50 total at 7.5% divided by 1.075 gives a $100 pre-tax price, so the tax was $7.50. Use the "Remove tax" mode to do this automatically.
Both add a percentage to purchases. US sales tax is added at checkout and varies by state and city, while VAT or GST used in many other countries is usually already included in the displayed price.
In the US, sales tax is set at the state, county and city level, so the combined rate differs by location. Some items, like groceries, may be taxed at a lower rate or exempt.
Yes, this sales tax calculator is completely free, needs no sign-up, and gives instant results directly in your browser.