Sales Tax Calculator

Add or Remove US Sales Tax in One Place

Enter a price and a tax rate and CipherForces Sales Tax Calculator instantly shows the pre-tax subtotal, the sales tax, and the grand total. Switch to Remove tax and it runs the other way: give it a tax-included total and it backs out the original price and the tax hiding inside it — the calculation receipts and invoices rarely spell out.

Pick a state to drop in its base statewide rate, or type your exact rate directly — county, city, and district taxes stack on top of the state base, so the rate field always stays editable. Add a quantity to price a whole order, and every figure is computed in whole cents, so the subtotal and tax always reconcile to the total to the penny with no rounding drift.

Everything runs entirely in your browser using plain JavaScript. Nothing you type is uploaded, and there is no signup or daily limit. One honest caveat: the built-in state rates are base statewide rates only, not the exact combined rate for a specific address — for a precise local total, enter the rate your point-of-sale or receipt shows.

• Quote a customer: Add the correct sales tax to a product or service price before you send the invoice, including the total they will actually pay.
• Reverse-engineer a receipt: Start from a tax-included total and find the pre-tax price and the exact tax charged — useful for expense reports and reimbursements.
• Bookkeeping and returns: Separate the taxable base from the sales tax collected on a lump-sum total when you record or remit it.
• Budget a purchase: See the real out-the-door price of a big-ticket item at your local rate before you buy.
• Price a bulk order: Set a per-item price and a quantity to get the subtotal, tax, and total for the whole order at once.
• Compare states: Switch the state base rate to see how much more or less tax the same purchase carries in different places.

Privacy: All calculations happen locally in your browser. Your prices and rates never leave your device, and nothing is sent to any server. Figures are for planning only and are not tax advice.