Sales Tax Calculator
Add or remove sales tax.
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About Sales Tax Calculator
The Sales Tax Calculator works out sales tax in two directions. Choose "Add tax to amount" to apply a tax rate to a pre-tax price and see the total, or "Remove tax from total" to back out the tax already baked into a receipt total and reveal the net price. It updates live as you type and shows the tax amount alongside the other figure.
It is completely free with no sign-up, and everything runs entirely in your browser. Your amounts and tax rates are never uploaded to a server, so you can quickly price products, check receipts, or reconcile invoices privately from any device.
Frequently asked questions
- Is the Sales Tax Calculator free to use?
- Yes, it is completely free with no account, sign-up, or usage limits. Use it as often as you like for adding or removing sales tax.
- Is my data uploaded or stored anywhere?
- No. All calculations happen locally in your browser using JavaScript. The amounts and tax rates you enter never leave your device and are not sent to any server.
- How do I add sales tax to a price?
- Select "Add tax to amount," enter the pre-tax amount and your tax rate as a percent. The tool multiplies the amount by the rate to get the tax, then adds it to show the total with tax.
- How do I remove sales tax from a total?
- Select "Remove tax from total" and enter the tax-inclusive total plus the rate. The tool divides the total by (1 + rate) to find the net price before tax, then shows the tax portion that was included.
- What tax rate should I enter?
- Enter your combined state and local sales tax rate as a percentage, for example 8.25 for 8.25%. Sales tax rates vary by state, county, and city, so check your jurisdiction's current rate.
- Does it handle decimals and large amounts?
- Yes. You can enter cents and large values, and results are formatted as US dollars with two decimal places and thousands separators for easy reading.