About This Tool
The Sales Tax Calculator computes the tax amount and final price when you add sales tax to a base price, or works in reverse to extract the pre-tax price from a tax-inclusive total. Enter either the before-tax or after-tax amount along with the tax rate.
Sales tax rates vary by state, county, and city across the United States, and by region in other countries. This calculator handles any rate you enter, whether it is the standard state rate or a combined local rate that includes county and city surcharges.
Businesses use this tool for quick invoice calculations, while consumers use it to verify receipts or estimate the true cost of purchases before checkout. The reverse calculation is especially useful when a listed price already includes tax and you need to find the base amount.