Sales Tax Calculator: Add, Remove and Find Tax Rate

Sales Tax Calculator

Add sales tax, remove tax from a tax-inclusive price, or calculate the effective sales tax rate from two prices.

Rules vary by jurisdiction and transaction.

Sales tax rate components

Enter one combined rate, or split it among the fields below. The calculator adds them.

Sales tax results

Price before tax—
Taxable amount—
Combined tax rate—
Sales tax—
Final total—
Total per item—

Sales tax formulas

  • Add tax: sales tax = taxable amount × combined rate ÷ 100.
  • Final total: pre-tax total + sales tax.
  • Reverse sales tax: pre-tax price = tax-inclusive price ÷ (1 + rate ÷ 100).
  • Find the rate: rate = (tax-inclusive price ÷ pre-tax price − 1) × 100.

Examples

SituationInputsResult
Add 8% tax$100 before tax$8 tax; $108 total
Remove 8% tax$108 including tax$100 before tax; $8 tax
Find the rate$50 before tax; $54 final8% effective rate
Multiple items3 × $20, $5 discount, 7% tax$3.85 tax; $58.85 total

Important limits

This calculator does not look up state, county, city or special-district rates. Enter the rate that applies to the exact location, item and transaction date. Taxability, exemptions, discounts, shipping rules, tax holidays and marketplace rules vary. Confirm official requirements before collecting, filing or paying tax.

Related calculators

Use the Discount Calculator for successive discounts and coupons, the Percentage Calculator for general percentage problems, or the IVA Calculator for Spanish-language VAT calculations.