semku

Sales tax calculator — reverse or add tax

Enter a price or tax-inclusive total and your sales tax rate.

Calculation
State rates
Enter dollars and cents, with no more than two decimal places. Enter your applicable combined state and local rate, with up to four decimal places.
Total including tax
$107.25
Price before tax$100.00
Sales tax$7.25
7.25% · rounded to the nearest cent, half a cent rounds up.

State base sales tax rates

Calculation rules

Add tax multiplies the price by the rate divided by 100, rounds tax once to cents, then adds it to the price. Remove tax divides the total by 1 plus the rate divided by 100, rounds the price to cents, then subtracts that price from the total to keep the displayed amounts consistent; half a cent rounds up.

In reverse mode, the calculator checks whether adding rounded tax to a cent price can reproduce your total and flags totals that cannot be reached. Item-level and receipt-level rounding can differ; exemptions, tax holidays and use tax are not applied.

The reference table lists state base rates using the source's statewide conventions, including mandatory local components where noted; additional local rates are excluded. Enter the rate applicable to your purchase, with up to four decimal places; accepted amounts run from $0 to $1,000,000,000,000 and accepted rates from 0% to 50%.

Frequently asked questions
How do I reverse sales tax from a total?
Choose Remove tax and enter the tax-inclusive total and rate; the calculator divides by 1 plus the rate as a decimal and rounds the resulting price to cents.
Why can a total be unreachable?
Rounded tax can make the total jump by more than one cent: at 7.25%, a $1.03 price totals $1.10 and a $1.04 price totals $1.12, so neither produces $1.11.
Can I use the state table as my checkout rate?
Check your location first. Additional local taxes can apply, including in Alaska even though it has no statewide sales tax; the table does not supply an address-specific combined rate.
What happens when the price or tax rate is zero?
Zero is accepted. A zero rate adds no tax; a zero amount produces a zero price, tax and total.

Privacy on this page

Calculations run in your browser. The values you enter are not sent to the server or saved in browser storage. Reloading the page returns the inputs to their initial state.

To understand how the page is used and to improve the service, this page sends semku’s own usage statistics and automatic error reports. They go only to the dedicated endpoint under semku.com/api/telemetry/v1/. They are not used for advertising or third-party tracking.

The usage statistics include the stage of use (such as starting an operation or requesting a copy), the time it happened and fixed identifiers that distinguish the page and feature. They do not include the values you enter, the results shown or the text you copy. Inputs are not sent as hashes or as size categories either. The full URL and search terms are not sent.

Operations and sessions are distinguished by randomly generated identifiers. In the browser these exist only in temporary memory and are not written to cookies or browser storage. No identification based on cookies or combined device characteristics is used.

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The feedback form sends the rating you chose and the text you typed in the free-text field when you press the send button. A random ID that distinguishes the submission, the page, site and published build, and the type of request are also sent. There are no fields for your name, email address or phone number, and the values you enter are not attached automatically. Whatever you write in the free-text field is sent as is. Please do not enter personal data, passwords, authentication keys or payment details.

To improve the service, we record the country and state/province-level region at the time of your visit (an estimate based on the connecting network), which site you came from including the page path, and one display-language setting announced by your browser (for example, en-US). Location is kept to country and region only; no city or precise position is recorded. When you use the service, connection records, including your IP address, are automatically generated and retained to maintain service security and identify abnormal access. Cloudflare is the data processor for this site. Collection of this item is enabled only after this notice is published; we do not collect it retrospectively for use before collection is enabled. Query strings such as search terms are not recorded, and neither is the full list of preferred languages or the raw request headers. To identify bots, we may collect and use signals your browser reports about its type and version, along with an indication of whether automation tools are being used. These browser signals are estimates and do not conclusively identify your browser's type or version or whether automation tools are being used. Collection of this information is currently disabled and will only be enabled after this notice is published. We do not collect it retrospectively for use before collection is enabled. The raw User-Agent request header is not recorded. These records are per visit only and use no identifier that links one visit to another. Recording starts only with visits after this notice is published and is not applied retroactively to earlier visits. The region and the referring site have been recorded since 2026-09-20; the display language since 2026-09-24. Browser signals are not recorded yet.

Separately, when you visit the site, the hosting provider records your IP address, the time of the request and user-agent information about your browser and device in Cloudflare Pages’ standard access logs.

For details, see the privacy policy in Korean.

Calculations run in your browser without sending the financial values you enter to the server or storing them. See “Privacy on this page” for information about access data.