How this calculator works
Add or back out sales tax from any price by rate or state. Values are processed instantly on this device, with checks for missing values and invalid divisions.
Tax: price * rate / 100 | Reverse: total / (1 + rate/100)
Worked example
Enter realistic values in each labeled field, select Calculate, and review both the primary answer and supporting details. Use Reset to clear the form before trying another scenario.
Frequently asked questions
What does the Sales Tax Calculator do?
Add or back out sales tax from any price by rate or state.
Are my values stored?
No. The calculation runs locally in your browser and the values are not submitted to us.
Can I rely on this result?
Use this as an informational estimate. Financial and tax outcomes depend on details not captured by a general calculator.
Important: This estimate is not financial, legal, or tax advice. Rates and rules can change.