How this calculator works
This calculator estimates sales tax on a purchase and finds the total after tax. Enter the subtotal and tax rate percentage to see the tax amount and final total. Use it when shopping, checking out, or comparing prices with tax included. The key inputs are the subtotal amount and the sales tax rate percentage. The output is the tax amount and the total price. Real-world applications include shopping, receipt verification, tax-inclusive pricing, and budget planning. The calculator multiplies the subtotal by the tax rate and adds the tax to the original subtotal. It does not use your local tax rate automatically, so enter the rate that applies to your purchase location. You can also use it for tip calculations by entering the tip rate as the percentage.