About this sales tax calculator
Add sales tax to a base price or extract it from a tax-inclusive total. Adding tax: tax equals the base price multiplied by the rate divided by 100, and the total is the base price plus that tax. Extracting tax: the base price equals the total divided by one plus the rate divided by 100, and the tax is the total minus that base price. Use this workspace to prepare a result you can review before putting it to use. All processing takes place on your device, without an account or an upload of your inputs. Check the examples to understand the expected output, read the limitations for the supported scope, and reset the form when you want to start a separate task.
How the sales tax calculator works
Adding tax: tax equals the base price multiplied by the rate divided by 100, and the total is the base price plus that tax. Extracting tax: the base price equals the total divided by one plus the rate divided by 100, and the tax is the total minus that base price.
Sales Tax Calculator examples
Add 8% tax to a $100 base price
Tax $8.00 · Total $108.00
Extract 8% tax from a $108 total
Base price $100.00 · Tax $8.00
Limitations & privacy
This calculates a single flat sales tax rate only; it does not handle multiple stacked tax jurisdictions, exemptions or tax-exempt categories. Confirm the applicable rate for your location.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Sales Tax Calculator: frequently asked questions
How does the sales tax calculator work?
Adding tax: tax equals the base price multiplied by the rate divided by 100, and the total is the base price plus that tax. Extracting tax: the base price equals the total divided by one plus the rate divided by 100, and the tax is the total minus that base price.
What can I inspect in the sales tax calculator result?
The tax breakdown helps you check the result before using it. This calculates a single flat sales tax rate only; it does not handle multiple stacked tax jurisdictions, exemptions or tax-exempt categories. Confirm the applicable rate for your location.
Does the sales tax calculator upload my input?
Processing happens in your browser. No tool input or output is uploaded to a server. Use Reset to clear the current workspace before starting a separate task.
Updated September 26, 2026