Finance
Sales Tax Calculator
Calculate the tax amount and final price from a pre-tax price, or estimate the tax portion already included in a total.
Trust note
Calculations happen instantly in your browser. No account, API, or data submission is required.
Finance calculator
Enter your numbers
Results update as you type. Amounts are shown in USD for convenience; use the same currency for all inputs.
Result
Enter the requested values to see your estimate.
Formulas
- Tax added = pre-tax price × tax rate / 100
- Total with tax = pre-tax price + tax added
- Tax included in total = total × tax rate / (100 + tax rate)
Worked examples
$100 with 8% tax added
Tax is $8 and the total is $108.
FAQ
Can I calculate tax already included in a price?
Yes. Choose the tax-included option and enter the total price and tax rate to estimate the tax portion and pre-tax amount.
Does this tell me the tax rate for my location?
No. Tax rules vary by location and product. Enter the rate that applies to your transaction.