Sales Tax Calculator

Calculate sales tax on a purchase or reverse a tax-inclusive total to find the pre-tax price.

Sales Tax Calculator helps you add sales tax to a price, or back out the pre-tax amount from a total. Enter amount and tax rate, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Sales tax calculator does Sales Tax Calculator is built for everyday questions — shopping, home, travel, hobbies, and tech. Add sales tax to a price, or back out the pre-tax amount from a total. You enter amount and tax rate, then Simple Calculators computes the result instantly. Defaults are chosen to be easy to read — change any field to match your situation. How the math works Forward: tax = price × rate, total = price + tax. Reverse: price = total ÷ (1 + rate), tax = total − price. The formula: Total = price × (1 + tax rate). To remove tax from a receipt total: price = total ÷ (1 + tax rate).