About this tool
The Sales Tax Calculator adds sales tax to a pre-tax price and shows both the tax amount and the final amount you pay. Enter a single taxable price, or paste a whole list of item prices (one per line) and the tool sums them into the taxable subtotal automatically. You can also enter a separate tax-exempt subtotal for items that are not taxed, which is added to the total but never has tax applied.
The math follows the standard US model. The combined rate is simply the state rate plus the local (county/city) rate: combined = state% + local%. The tax is tax = taxable_subtotal × (combined ÷ 100), rounded to the nearest cent, and the total = taxable_subtotal + exempt_subtotal + tax. The effective rate shown is tax ÷ taxable × 100, which equals the combined rate whenever there is a taxable amount — a quick sanity check that the rate was entered correctly.
Everything runs locally in your browser; nothing you type is uploaded. Amounts are formatted with your locale's thousands separators and two decimal places. Because US jurisdictions stack a state rate with county, city, and district rates, keeping state and local as separate fields lets you reproduce a receipt exactly — enter 6 and 2 for an 8% combined rate, or put the whole rate in one box and leave the other at 0.