Sales Tax Calculator
Calculation Mode

Calculate sales tax to add to an amount

Common Tax Rates
Guide & Explanations

How to use

  1. Select calculation mode:
    • Add Tax: Calculate the sales tax to add to a price
    • Remove Tax: Extract the sales tax from a tax-inclusive amount
  2. Enter amount: Input the relevant amount based on your selected mode
  3. Enter tax rate: Use the input field or select one of the common rates
  4. Click Calculate: The results will show with sales tax breakdown
  5. View formula: Click "Show Formula" to see detailed calculation steps

Tip: Your calculation history is saved during your session. Click on any previous calculation to reload it.