Using this sales tax calculator you can find the 'Final Price including Tax', the 'Sale Tax', the 'Tax On' some item as well as the 'Before Tax Price'., Firstly, if the tax is expressed in percent, divide the tax rate by 100. You can do this by simply moving the decimal point two spaces to the left. In this example, we do 5.3/100 = 0.053 ; Now, find the tax value by multiplying tax rate by the item value: tax = 1 × 0.053 tax = 0.053, What is the total price he has to pay for the clothes?Step 1: (Original Price)(Tax Percent) = Amount of Tax Step 2: Original Price + Amount of Tax = $, A state has a sales tax of 7 percent. Find the total cost of these items, including tax., Enter the total amount that you wish to have calculated in order to determine tax on the sale. Enter the sales tax percentage. For instance, in Palm Springs, California, the total sales tax percentage, including state, county and local taxes, is 7 and 3/4 percent., Free calculator to find the sales tax amount/rate, before tax price, and after-tax price. Also, check the sales tax rates in different states of the U.S., .