How do I calculate sales tax?

Multiply the pre-tax price by the tax rate (as a decimal). For a $100 item with 8% tax: $100 × 0.08 = $8 tax, $108 total.

Sales Tax Calculator

Estimate tax amount and total after sales tax.

This tool runs in your browser. None of your data is saved or sold.

Amount before tax ($)

Tax rate (%)

Extra fees ($)

Price includes tax?

About This Calculator

Sales tax rates vary by state, county, and city — the combined rate can range from 0% (Oregon, Montana, New Hampshire, Delaware) to over 10% in some California and Tennessee jurisdictions. This calculator adds tax to a pre-tax price or can reverse-calculate a pre-tax price from a tax-inclusive total.

Estimates only — not financial, tax, legal, or investment advice. Verify important results with a qualified professional before making decisions.

tax = amount × rate; total = amount + tax; reverse: pre-tax = tax-inclusive total ÷ (1 + rate)