Work out sales tax in both directions. Enter a price before tax and a tax rate to see the tax amount and the final total you would pay at the register, or switch modes to start from a tax-inclusive total and extract the original net price plus the tax hidden inside it. This is handy when you need to add a local tax rate to a quote, or when a receipt only shows the grand total and you need the pre-tax figure for expenses or bookkeeping. The calculator handles any tax rate and any currency, since it only works with the numbers. Toggle between the two modes and the result updates instantly, all computed locally in your browser.