Worked example
An $80 item at 8% sales tax adds $6.40, for a total of $86.40.
Enter your numbers
Adjust the example to calculate using your own figures. Results update instantly.
Your results
Calculated locally- Sales tax
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- Total including tax
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Important assumptions
Sales tax exemptions, item categories, state rules and rounding can alter actual checkout tax.
How to use your results
Enter the correct tax rate for the transaction and location. The amount of tax is added to the pre-tax subtotal.
Start with the example values, then replace them with amounts for the same transaction or time period. Double-check rates and units. The results are estimates intended to help you explore possible outcomes, not financial or tax advice.
Tax-inclusive versus tax-exclusive prices
This calculator starts with a pre-tax amount and adds sales tax. If the store already includes tax in the quoted price, do not add the same tax again. Extracting tax from a tax-inclusive price uses a different formula.
Sales tax is location-specific
US tax obligations vary by state, city, product category and transaction type. Some goods are exempt and some jurisdictions have multiple tax layers. Enter the actual combined rate applicable to the sale.
Is an 8% sales-tax rate an 8% markup on the seller's profit?
No. Sales tax is based on the taxable sale amount, not the seller's profit margin; the tax generally is collected for the relevant tax authority.
How to calculate sales tax
Sales tax = pre-tax price × tax rate ÷ 100
Enter the correct tax rate for the transaction and location. The amount of tax is added to the pre-tax subtotal.