Sales Tax Calculator
Add or remove U.S. sales tax and calculate the tax amount.
Last updated: July 2026
Total with tax
$0.00
- Pre-tax price: $0.00
- Sales tax: $0.00
On this page
Quick summary: Add or remove U.S. sales tax and calculate the tax amount. Enter the requested values, calculate, review the result, and compare more than one realistic scenario before making a decision.
Read the complete guide
What this calculator does
The Sales Tax Calculator estimates the tax added to a pre-tax purchase price and the resulting total. It can also help compare totals under different local tax rates.
How to use the calculator step by step
Enter the pre-tax price and the sales tax rate as a percentage. Select Calculate to see the tax amount and final price.
How the calculation works
Sales tax equals price × tax rate. The final total equals price + sales tax. A 100 purchase at 8.25% tax produces 8.25 tax and a total of 108.25.
Worked example and scenario testing
For an item costing 240 with a 7.5% sales tax rate, the tax is 18 and the final total is 258.
How to interpret your result
The result assumes the entire entered price is taxable at one rate. Actual receipts may differ if some items are exempt or different rates apply.
Accuracy, assumptions, and limitations
Local rules can include state, county, city, district, holiday, product-specific, or service-specific treatment that a single-rate calculator cannot model.
Common mistakes to avoid
Do not enter 0.0825 if the field expects 8.25%. Also make sure the price entered is before tax rather than an already-taxed total.
Privacy and browser-based calculations
Only purchase price and tax rate are processed. No payment or identity details are needed.