Sales Tax Calculator
Add sales tax to a price, or see the tax portion of a total.
Your figures
Result
How to use this tool
- Enter your own figures over the defaults — Amount before tax, Sales tax rate.
- The answer updates as you type. There is no button, and nothing is sent anywhere.
- Change Sales tax rate on its own to see how much it moves the result — the worked example below shows exactly that.
US sales tax varies by state, county and city, and combined rates commonly range from zero to over 10%. Enter your specific combined rate rather than a state average.
How it works
This takes 2 inputs — amount before tax, sales tax rate — and returns total with tax and tax. The whole calculation happens in this page as you type: there is no submit button, no request, and nothing stored.
Because it recalculates on every keystroke you can use it as a sensitivity test rather than a one-shot answer. Moving sales tax rate alone from 8.25 to 9.25 changes total with tax from 108.25 to 109.25 — the worked example below sets that out in full.
A worked example
Worked through with the figures the page already has in it: amount before tax of 100 and sales tax rate of 8.25 %, giving total with tax of 108.25. These numbers come from running the calculator’s own code, not from being typed in here, so they cannot drift away from what you see on screen.
Starting from:
- Amount before tax: 100
- Sales tax rate: 8.25 %
| Result | Value |
|---|---|
| Total with tax | 108.25 |
| Tax | 8.25 |
What happens when one input moves
Holding everything else steady and changing Sales tax rate from 8.25 % to 9.25 % — one percentage point — moves the answer like this:
| Figure | 8.25 % | 9.25 % |
|---|---|---|
| Total with tax | 108.25 | 109.25 |
| Tax | 8.25 | 9.25 |
That is usually the number worth arguing over: it is easier to move than the headline amount, and the difference compounds across the whole term.
Sales Tax Calculator — frequently asked questions
What rate should I use?
Your combined state, county and city rate. These stack, and two addresses in the same city can differ if one sits in a special district.
Which states have no sales tax?
Delaware, Montana, New Hampshire and Oregon have no statewide sales tax. Alaska has none at state level but permits local sales taxes.
Is sales tax charged on services?
It varies by state. Many tax goods but only some services, and the rules differ significantly between jurisdictions.
Is this calculator free?
Yes, with no account, no limits and no data collection. It runs entirely in your browser.
Should I rely on this for a financial or medical decision?
No. It is a planning estimate built on standard formulas and stated assumptions. For decisions that matter, speak to a qualified professional who can account for your full circumstances.
How accurate is the Sales Tax figure?
The arithmetic is exact. With the defaults on this page — amount before tax 100, sales tax rate 8.25 % — it returns total with tax of 108.25. What limits accuracy is the assumptions, not the maths: change sales tax rate to 9.25 % and the same formula gives 109.25. Treat it as a well-founded estimate, not a quotation.
Related tools
From other categories
Background reading: Loan, Mortgage and Investment Calculators Explained
Nothing is sent anywhere. The figures you type stay in this page and are never transmitted or stored — how that works.
Disclaimer. The formula is exact; the answer is only as good as the figures and assumptions above. Not financial, tax, medical or legal advice. Full disclaimer.