Calculate sales tax with our free Sales Tax Calculator. Add sales tax to net pre-tax prices or reverse extract tax amounts from gross total payments with 100% offline privacy.
Choose Add Tax (Net to Gross) to add tax to a pre-tax amount, or Remove Tax (Gross to Net) to reverse tax out of a total cost.
Input your starting dollar price and the applicable state/city sales tax rate percentage using range sliders or input boxes.
Instantly view calculated tax amount, final gross/net price, and step-by-step mathematical solution breakdown.
Your financial figures are processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool 100% private.
Calculations execute locally in real time as you adjust price inputs, tax rates, or toggle between Add and Remove modes. Results update dynamically without delays.
Supports both forward sales tax addition (\(\text{Gross} = \text{Net} \times (1 + \text{Rate})\)) and reverse tax extraction (\(\text{Net} = \text{Gross} \div (1 + \text{Rate})\)) on a single screen.
Sales Tax Calculation is the process of applying state, county, or local sales tax rates to commercial transactions, either to calculate total customer cost or reverse tax from total receipts.
The mathematical equations are:
\(\text{Add Tax (Net to Gross): } \text{Tax} = \text{Net} \times \left(\frac{\text{Rate}}{100}\right), \quad \text{Gross} = \text{Net} + \text{Tax}\)
\(\text{Remove Tax (Gross to Net): } \text{Net} = \frac{\text{Gross}}{1 + \left(\frac{\text{Rate}}{100}\right)}, \quad \text{Tax} = \text{Gross} - \text{Net}\)
Combined Sales Tax Rates: Total sales tax equals state tax + county tax + city tax. For instance, a 4% state tax + 2% county tax + 2.875% city tax equals a combined sales tax rate of 8.875%.