Sales Tax Calculator
Add sales tax to a pre-tax price or extract the tax from a total at any rate.
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Frequently asked questions
Add mode treats your input as the net (pre-tax) price and shows the tax and grand total. Extract mode treats your input as the gross total already including tax, then backs out the net price and tax amount.
No. Sales tax in the US varies by state, county, and even city. You enter the rate that applies to your purchase. The calculator does the math — confirm the rate with your local tax authority before relying on it for filings.
Extracting tax from a gross total uses the formula net = gross / (1 + rate). Rounding to cents can introduce a one-cent difference depending on the values you enter — that's normal.
Last updated 2026-06-03.