Sales Tax
Calculator.
Enter the pre-tax amount and the tax rate to instantly see the tax added and the final price. Flip to Tax Inclusive mode to reverse-engineer the net price from a total. Everything runs in your browser.
What is sales tax?
Sales tax is a consumption tax charged on the sale of goods and services. It is usually a percentage of the pre-tax price, added at the point of sale. Common examples include the US state and local sales tax, India's GST, and the European VAT.
Add tax (tax exclusive)
When the price quoted is before tax, multiply the amount by the tax rate to get the tax, then add it back for the total.
Tax = Amount × Rate / 100 Total = Amount + Tax
Reverse tax (tax inclusive)
When the price quoted already includes tax, divide by
1 + rate/100 to recover the pre-tax amount.
Amount = Total / (1 + Rate / 100) Tax = Total − Amount
EX: Pre-tax 1000 at 18% GST Tax = 1000 × 0.18 = 180 Total = 1000 + 180 = 1180