Add tax formula
Tax amount = price x tax rate. Total = price + tax amount.
Tax and checkout calculator
Sales Tax Calculator
Add sales tax to a pre-tax price or reverse sales tax from a tax-included total. This helps shoppers, sellers, and small businesses estimate checkout totals and tax amounts quickly.
Calculate sales tax
Pre-tax price
$0
Sales tax
$0
Total after tax
$0
Tax rate
0%
Reverse tax formula
Pre-tax price = tax-included total / (1 + tax rate). Tax amount = total - pre-tax price.
Best for
Retail purchases, online checkout estimates, receipts, business quotes, invoice checks, and price comparison.
Important note
Sales tax rates vary by state, city, product type, exemptions, and marketplace rules. This calculator is for estimation and does not replace tax advice or official local tax lookup.
FAQ
What is reverse sales tax?
Reverse sales tax finds the pre-tax price and tax amount when you only know the final tax-included total.
Should shipping be taxed?
It depends on local rules. Some jurisdictions tax shipping or handling, while others do not.