Sales Tax Calculator
Subtotal, sales tax and total.
Enter your values in the interactive calculator to see an instant result. Calculations run in your browser, without an account.
Results are estimates for educational use; confirm important decisions with appropriate experts.
Formula • Worked example • Interpretation
Add sales tax to a subtotal
Sales tax is usually calculated as a share of the taxable purchase amount. Use the local combined tax rate applicable to the item and location.
Calculation method
Worked example
A $50 taxable purchase at 8% sales tax adds $4 tax, for a $54 total.
What your result means
State and local sales taxes can differ across neighboring jurisdictions, and some product categories are exempt or taxed differently.
Tips for better calculations
Confirm the rate on your receipt or local government website instead of assuming a single national rate.
Assumptions and limitations
This calculator does not look up local tax rates or determine exemptions. Rounding practices may differ when each line item is taxed individually.
SiCalcs tools provide estimates and educational calculations; they do not replace professional financial, medical, tax, or legal advice.