About the Sales Tax Calculator
Sales tax is applied on top of a price at a rate set by your state and locality. This tool both adds tax to a pre-tax price and works backward to find the pre-tax amount and tax inside a receipt total.
How it’s calculated
Add: total = price × (1 + rate). Remove: price = total ÷ (1 + rate), and tax = total − price.
Example calculation
A $99 item at a 7.25% rate totals $106.18, of which $7.18 is tax.
Frequently asked questions
What sales tax rate should I use?
Rates depend on the state, county, and city of the sale and change over time — this calculator uses whatever rate you enter. Check your local rate before relying on the result.
Can it find the tax already in a total?
Yes — switch to the remove-tax mode to split a tax-inclusive total into its pre-tax price and the tax portion.
This tool provides estimates for general informational and educational purposes only. Results are based on the values you enter and standard formulas, and may not reflect your specific circumstances.