| Tax amount | -- |
| Price before tax | -- |
| Total with tax | -- |
Sales Tax Calculator
Add tax to a price, or reverse it out of a total that already includes tax.
How sales tax is calculated
Adding tax: tax = price × (rate ÷ 100), total = price + tax. Removing tax from a total that already includes it: pre-tax price = total ÷ (1 + rate ÷ 100), and the tax amount is the difference.
Example: a $100.00 item at an 8.25% tax rate comes to $8.25 in tax and a $108.25 total. Going the other way, a $108.25 total at 8.25% tax backs out to a $100.00 pre-tax price.
Sales tax rates vary by state, county, and city in the US, so enter the exact combined rate for your location — this tool doesn't assume a rate for you.
Five states have no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon — though Alaska still allows local sales taxes, averaging around 1.82% per Kiplinger's 2026 tally. Example: a $34.99 item at a 6% rate comes to $2.10 in tax and a $37.09 total.
The most common mistake is entering only the state rate and forgetting the local county or city tax layered on top of it, which understates the real combined rate almost everywhere one applies. Whether services (not just goods) are taxed also varies by state — check your state's own rules rather than assuming.