Add sales tax to any price, or switch to reverse mode to find the pre-tax price hidden inside a tax-inclusive total.
Results update as you type. Reverse mode splits a total back into price + tax.
Multiply the amount by the tax rate divided by 100 to get the tax, then add it to the amount for the total. For example, 8% tax on $50 is 0.08 × 50 = $4, so the total is 50 + 4 = $54.
Divide the tax-inclusive total by (1 + rate ÷ 100). For example, a $54 total at an 8% rate had a pre-tax price of 54 ÷ 1.08 = $50.
Tax = amount × rate ÷ 100, and total = amount + tax. To reverse it, pre-tax = total ÷ (1 + rate ÷ 100).