Calculator

Sales Tax Calculator

Calculate sales tax, after-tax price and reverse a tax-inclusive total.

UNDERSTAND THE ANSWER

How is this calculated?

The calculator multiplies unit price by quantity, applies the percentage tax to that subtotal and adds the tax to get the final total.

Sales tax formulaTax = Pre-tax subtotal × Tax rate ÷ 100

A practical example

A $100 purchase taxed at 6.5% has $6.50 in sales tax and costs $106.50 after tax.

Calculation assumptions

  • One combined percentage tax rate applies to the entire pre-tax subtotal.
  • Every entered item is taxable at the same rate.
  • Tax is calculated before any jurisdiction-specific rounding rule.