How sales tax is calculated
To add tax: multiply the price by the tax rate and add it to the original price. To find the pre-tax price from a tax-included total, divide the total by (1 + tax rate).
Sales tax vs. VAT vs. GST
Different countries use different names and methods for consumption tax — US sales tax is usually added at checkout, while VAT/GST in many other countries is already included in the displayed price. This calculator handles both directions, so it works regardless of which system applies to you.
Tax rates vary by state, province or country — check your local rate before relying on this for an official calculation.