Sales Tax Calculator in your browser, no signup

Sales tax in the United States is set locally, not nationally, which is why the same purchase costs a different amount in Portland than it does in Chicago. Five states - Alaska, Delaware, Montana, New Hampshire and Oregon - charge no state sales tax at all, while combined state and local rates elsewhere reach past 10%. This calculator works in both directions: add tax to a listed price to find what you will actually pay, or take a receipt total and work backwards to separate the tax from the item price, which is what you need when reconciling expenses or filling in a return.

These numbers are the kind you check twice before sending a quote, a tax form or a loan application. The tool does the arithmetic; you still own the inputs.

Sales Tax Calculator is a good fit when shoppers checking the real cost of an item before reaching the checkout.

In plain English

Sales Tax Calculator is built around a few practical wins, not a long feature list:

• Works in reverse, so you can split a receipt total back into price and tax without doing algebra.
• Covers all 50 states plus DC, including the five with no state sales tax.
• Lets you override with an exact known rate rather than forcing you to accept an average.
• Runs entirely in your browser - nothing you type is uploaded.

How to run it

1. Choose which way you are calculating. Pick "Add tax to a price" for a pre-tax amount, or "Remove tax from a total" if the figure you have already includes tax.
2. Enter the amount. Type the price or the total. The result updates as you type - there is no submit button.
3. Select your state. The state rate is applied automatically. All 50 states and the District of Columbia are included.
4. Decide about local tax. Leave "include average local tax" ticked for a realistic estimate, or untick it to see the state rate alone.
5. Or enter an exact rate. If you already know your precise combined rate - from a receipt or your tax authority - type it in and it overrides the state lookup.

Real situations

• Shoppers checking the real cost of an item before reaching the checkout.
• Freelancers and small businesses adding the right tax line to an invoice.
• Anyone reconciling expenses who needs the tax portion separated out of a total.
• Online sellers estimating what a customer in another state will be charged.
• Travellers comparing what the same purchase would cost across state lines.

Small habits that help

• For anything official - a filing, an invoice you will be held to - confirm your exact rate with your state revenue department. Averages are for estimating.
• Groceries, prescriptions and clothing are exempt or reduced-rate in many states. This tool applies one rate to the whole amount, so check whether your item qualifies.
• If you know your combined rate from a recent receipt, use the exact-rate box. It will always beat an average.
• Buying a car, a boat or anything registered is often taxed under separate rules at a different rate.

Skip these

• Assuming one rate covers a whole state. Local rates vary by city, county and special district - Alabama alone has hundreds of distinct combined rates.
• Removing tax by multiplying the total by (1 - rate). That understates the base. The correct maths is total divided by (1 + rate), which is what this tool does.
• Thinking Alaska is tax-free. It has no state sales tax, but many Alaskan boroughs and cities levy their own.
• Using an average local rate on an invoice. Use your actual jurisdiction rate for anything a customer or auditor will see.

Does anything leave your device?

Sales Tax Calculator runs in your browser. The file or text you paste stays on your device. There is no account, and nothing is stored on a ToolBox server for this job.

Related tools worth opening next

If this is one step in a longer job, these usually come after it:

• GST / VAT Calculator - Add or remove GST and VAT from any amount
• Discount Calculator - Calculate sale price, savings and discount percentage
• Tip Calculator - Calculate tip amount and split the bill between multiple people

FAQ

Which states have no sales tax?

Alaska, Delaware, Montana, New Hampshire and Oregon charge no state-level sales tax. Alaska is the exception worth knowing about: it has no state tax but does allow local sales taxes, so many Alaskan cities and boroughs still charge one.

How do I calculate sales tax backwards from a total?

Divide the total by 1 plus the tax rate expressed as a decimal. A $107.25 total at 7.25% is 107.25 / 1.0725 = $100.00 before tax, making the tax $7.25. Multiplying the total by the rate instead is a common error and gives a slightly wrong answer.

Why is the rate here different from what I was charged?

The combined figure uses a population-weighted average of local rates across your state, not the rate at your specific address. Your city or county rate may be higher or lower. If you know your exact rate, enter it in the custom rate box.

Is this calculator free?

Yes, completely free with no sign-up, no limits and no watermark. It runs in your browser, so nothing you enter is sent to a server.

Which state has the highest sales tax?

Louisiana has the highest average combined state and local rate at around 10.11%, followed by Tennessee, Washington, Arkansas and Alabama. California has the highest state-level rate on its own at 7.25%.

Do I charge sales tax based on where I am or where my customer is?

For most online sales, US states use destination-based sourcing, meaning the rate is the one where your customer takes delivery. Rules differ by state and by whether you have nexus there, so check with a tax professional before setting up collection.

Are groceries taxed?

It varies a lot. Many states exempt unprepared food entirely, some tax it at a reduced rate, and a few tax it in full. This calculator applies a single rate to the whole amount, so check your state rules if you are pricing exempt goods.

How current are these rates?

The rates are from the Tax Foundation as of 1 January 2026, and the page shows the date they were last checked. State rates change rarely; local rates change more often, which is another reason to confirm before filing.

Open the Sales Tax Calculator when you are ready. It is free, and you do not need an account.