Sales Tax Calculator
Add sales tax to a price or remove it from a total. Enter a rate or pick your state to auto-fill the 2026 base rate, and see the tax and total instantly.
How the sales tax calculator works
In "add" mode it multiplies your pre-tax price by the sales tax rate to find the tax, then adds it back for the total. In "remove" mode it works the other way, dividing a tax-inclusive total by one plus the rate to recover the original price. Pick a state to drop in its 2026 base rate, or enter your own combined state-and-local rate.
Worked example: with amount of $100 and sales tax rate of 7.25%, the sales tax calculator shows total with sales tax of $107.25.
- Pre-tax price
- $100.00
- Sales tax
- $7.25
- Total with tax
- $107.25
- Rate applied
- 7.25% · custom
| Purchase amount | Total with sales tax |
|---|---|
| $25 | $26.81 |
| $100 | $107.25 |
| $500 | $536.25 |
| $1,000 | $1,072.50 |
| $5,000 | $5,362.50 |
The formula
Sales tax = price × rate, and total = price × (1 + rate). To back tax out of a total: price = total ÷ (1 + rate), then tax = total − price.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.
Questions about the sales tax calculator
How do I calculate sales tax on a purchase?
Multiply the pre-tax price by the tax rate written as a decimal. At 7.25%, a $100 item carries $7.25 of tax, for a $107.25 total. Enter your price and rate above to see the exact tax and total.
How do I remove sales tax from a total?
Divide the tax-inclusive total by 1 plus the rate — not by subtracting the rate. On a $107.25 total at 7.25%, the pre-tax price is 107.25 ÷ 1.0725 = $100, so $7.25 was tax. Switch to "remove" mode to do this automatically.
Does the state rate include local city and county tax?
No. The state picker fills only the state base rate. Most states let counties and cities add their own sales tax, which can push the combined rate several points higher. For an exact checkout total, choose "Custom" and enter your local combined rate.
Which states have no sales tax?
Five states charge no statewide sales tax: Alaska, Delaware, Montana, New Hampshire and Oregon. Of those, only Alaska allows local sales taxes, so a purchase there can still be taxed at the city or borough level.
Is the Sales Tax Calculator free to use?
Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.
- Sales Tax Rates by State (2026) — The 2026 state sales tax rate for every state, plus the maximum combined rate with local taxes.