Sales Tax Calculator
Calculate sales tax amount and final price for any purchase, or reverse-calculate the pre-tax price from a total.
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Sales Tax Basics
Sales tax is charged on retail purchases and varies by state and locality. The US average combined state and local sales tax rate is about 7.12%. Some states have no sales tax (Oregon, Montana, New Hampshire, Delaware, Alaska).
What is the Sales Tax Calculator?
The Sales Tax Calculator determines the true "out-the-door" cost of a product by adding the local government tax surcharge. It can also be used in reverse to extract the pre-tax price from a total receipt.
How It Works (Algorithm)
The math involves a simple percentage increase. The tool converts the tax rate into a decimal, multiplies it by the base price to find the exact tax amount, and then adds that amount to the base price to find the Gross Total.
$$ \text{Total Price} = \text{Base Price} \times \left(1 + \frac{\text{Tax Rate}}{100}\right) $$
The straightforward formula for applying consumer sales taxes.
How to Use It
Enter the price tag of the item. Enter your local or state sales tax percentage. The calculator will immediately output how much you owe in taxes and what your final register total will be.