Sales Tax Calculator — Add, Remove or Solve for Tax

How to use

1. Pick your state — the base rate fills in (edit it to your exact combined rate if you know it).
2. Choose the mode: Add tax, Remove tax, or Solve for rate.
3. Enter the amount(s) you know and compute.
4. Read the breakdown — and verify the final rate with your state DOR for purchases that matter.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

US sales tax is state + county + city + special districts stacked — the same cart can be 0% in Oregon or over 10% in parts of Louisiana, California or Tennessee. This calculator handles all three everyday problems in one place: add tax to a pre-tax price, remove tax from a receipt total (total ÷ (1 + rate) — the math every reseller and freelancer needs), and solve for the rate when you know the before and after amounts. The state dropdown loads the published state base rate for all 51 jurisdictions and says plainly what it is: a starting point — local add-ons stack on top and only your state's Department of Revenue can give the exact combined rate for your address. A receipt-style breakdown shows pre-tax, tax and total, and the dashboard gauge shows the tax share of the total at a glance. Everything computes in your browser; nothing is stored or sent.

FAQ

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