Sales Tax Calculator
Add sales tax to a price, or work backwards from a total to find the pre-tax price and the tax included in it. Choose a US state's base rate or enter your own.
State-level base rate only — county and city rates often add more. Confirm the combined rate for your address.
Formula and calculation
Worked example
A $100 purchase at 7%: the tax is $7.00 and the total is $107.00. Running the other direction — removing 7% from $107 — returns the pre-tax price of $100 exactly.
What the results mean
- Price with tax
- The price with sales tax added — what you pay at the register.
- Sales tax
- The sales tax itself in dollars: gross price minus pre-tax price.
- Price before tax
- The price before tax — what the seller receives, before fees.
- Tax rate used
- The tax rate applied, and where it came from (state base rate or your custom entry).
Frequently asked questions
How do I add sales tax to a price?
Multiply the price by the rate and add it: $100 at 7% → $7 of tax, $107 total. This calculator's first mode does that for any rate, including state base rates.
How do I remove sales tax from a total?
Divide the total by 1 + rate: a $107 total at 7% is 107 ÷ 1.07 = $100 exactly. Subtracting 7% of $107 (=$7.49) would be wrong — the tax applies to the smaller pre-tax amount.
Why is my real tax different from the state rate shown?
Because most states allow local sales taxes on top: county, city and district rates commonly add 1–3 percentage points, and some states differ by item type (groceries in many states are exempt, for example). Use your actual combined rate in the custom field.
Are these rates current?
The table holds each state's base rate as reviewed in 2025. States change rates occasionally, and local rates change more often — for anything financial, verify with your state's department of revenue.