Free Online Tax Calculators
The one thing all these calculators have in common: they bridge the gap between the price you see and the price you actually pay. That gap is tax, and depending on where you are and what you're buying, it can range from 0% to over 10%. Every tool on this page attacks the same basic problem from a different starting point.
Maybe you're staring at a receipt and need to figure out how much of the total was tax. Maybe you're budgeting a purchase and want to know what the register will actually say. Or maybe you're running a small business and need to back out the tax on 200 transactions before lunch. I built each calculator to handle one specific scenario really well, rather than cramming everything into a single confusing tool. Pick the one that matches your situation, plug in your numbers, and you'll have an answer in about two seconds. No sign-up, no paywall, no email capture forms. Just math.
What's Available Here
Reverse Sales Tax Calculator
Got a receipt total and need the pre-tax amount? This is the one. Select your state or enter a custom rate, and it splits the total into original price and tax paid.
Sales Tax Calculator
The opposite direction — start with a price before tax, pick your rate, and see what the total will be. Useful for budgeting before you buy.
Percent Off Calculator
Figure out what a sale price actually comes out to after a percentage discount. You can optionally layer sales tax on top of the discounted price.
VAT Calculator
For international purchases — add or remove VAT from any price. Pre-loaded with UK, Germany, France, Spain, and other common rates.
Which Calculator Do You Need?
| You have... | You need... | Use this |
|---|---|---|
| A receipt total with tax included | The original pre-tax price | Reverse Sales Tax Calculator |
| A price before tax | The total after tax | Sales Tax Calculator |
| An original price and a discount % | The sale price | Percent Off Calculator |
| A gross or net price with VAT | The other side of the VAT calculation | VAT Calculator |
A Note on Tax Rates
Sales tax in the United States is not one number. It's actually a stack of rates layered on top of each other, and the total depends on where you happen to be standing when you make the purchase. Every state that collects sales tax sets a base state rate. Then counties can add their own percentage. Cities sometimes pile on another fraction. Special taxing districts — transit authorities, stadium bonds, that sort of thing — add even more in certain areas.
When you add it all up, there are roughly 12,000 distinct tax jurisdictions across the country. Twelve thousand. Tennessee's combined state and local rate averages about 9.55%, and if you're buying something in parts of Memphis, the total rate can hit 10%. Meanwhile, Delaware charges exactly 0% — no sales tax at all. Oregon, Montana, and New Hampshire are in the same boat.
So when someone asks "what's the sales tax rate?" the honest answer is: it depends on exactly where you are. The rates built into these calculators use state-level averages that include a blended local component, which is accurate enough for quick estimates. But if you need the precise rate for your specific ZIP code — say, because you're filing returns or reconciling books — you should use the custom rate field and enter the exact combined rate for your jurisdiction. A quick call to your city or county tax office will get you that number if you don't already have it.
How These Tools Are Built
Every calculator on this site runs entirely in your browser. There's no server processing, no API calls, no latency. You type a number, the math happens instantly on your device, and the result appears. I source the built-in state rates from the Tax Foundation's 2025 data, which is — as far as I can tell — the most reliable public dataset for combined state and local averages.
But here's the thing I realized early on: averages don't always match reality. If you're in a city with a special district surcharge, the blended average for your state might be off by half a percent or more. That matters when you're working with large invoices. So I built the custom rate field specifically because blended averages don't always match your exact ZIP code. Enter your real combined rate and the calculation is precise to the penny. I also added multi-item mode and CSV export to the main reverse calculator after getting emails from bookkeepers who were running the same calculation 50 or 60 times in a row. Seemed silly not to automate that.
Frequently Asked Questions
Yes, completely. No sign-up, no paywall, no limit. I run ads to cover hosting costs, but the tools are free forever.
I update the built-in rates when the Tax Foundation publishes their annual data, and I do spot updates when states announce mid-year changes. Louisiana changed its rate in January 2025 — that kind of thing gets updated within a few weeks.
Absolutely. Bookkeepers, accountants, small business owners — they're the biggest user group. The multi-item mode and CSV export on the main calculator were built specifically for batch business use. Just remember the disclaimer: verify rates for anything legally binding.
Use the custom rate field. The built-in rates are state-level averages that include a blended local component. If you know your exact county or city rate, the custom field gives you a precise result.