Sales tax calculator (US)
ReadyAdd sales tax to a price or work back to the pre-tax price from a receipt total. You enter your combined state and local rate, so it works for any state, county or city.
Rules applied
Checked on 2026-10-20 · tax year user-entered rate
- California CDTFA – Sales and use tax rates
- Texas Comptroller – Sales and use tax
- Florida Department of Revenue – Sales and use tax
No state or local rates are built in. Use your state department of revenue’s rate lookup (examples above) and enter the combined rate.
Every rate and threshold used in the calculation was checked against the official sources above.
How to use
- Choose whether to add tax to a price or remove it from a total that already includes tax.
- Enter the amount and your combined sales tax rate (state + county + city). Look the rate up on your state’s department of revenue website.
- Read the tax and the total. Results are rounded to the nearest cent.
Formula
- Add tax: tax = price × rate ÷ 100, total = price + tax
- Remove tax: tax = total × rate ÷ (100 + rate), price = total − tax
Worked example
$80.00 at 8.25% → tax $6.60, total $86.60. A receipt total of $108.25 at 8.25% → price before tax $100.00, tax $8.25.
FAQ
Why doesn’t the calculator know my state’s rate?
Sales tax in the US is set by states, counties, cities and special districts, and rates can change several times a year and even differ between two sides of a street. Rather than show a rate that might be wrong, we ask you to enter the combined rate from your state’s official lookup tool.
Is every item taxed at the same rate?
Not always. States can exempt some items or tax them at a different rate, so check your state department of revenue’s rules for what you are buying.
How is rounding handled?
Tax is rounded to the nearest cent (half a cent rounds up). Some retailers round per item instead of per receipt, so a long receipt can differ by a cent or two.
Data sources
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