Add sales tax to a price or remove sales tax from a total with this free sales tax calculator. Quickly calculate tax amount, subtotal, before-tax price, and final total for purchases and receipts.
Enter your values and click Calculate to add or remove sales tax.
This sales tax calculator helps you either add sales tax to a price or remove sales tax from a final total. It can also account for quantity and a flat discount before calculating the tax result.
Use it when shopping, reviewing receipts, estimating purchase totals, or finding the original before-tax price from a tax-included amount.
When adding sales tax, the calculator uses:
Sales Tax = Subtotal × Tax Rate
Final Total = Subtotal + Sales Tax
When removing sales tax, it uses:
Before-Tax Price = Total ÷ (1 + Tax Rate)
Sales Tax = Total - Before-Tax Price
Tax rate should be entered as a percentage, such as 7 for 7%.
Some advertised totals already include tax, while most shelf prices do not. Choose the correct calculation type for accurate results.
In many cases, discounts reduce the taxable amount first, though exact tax treatment may vary by jurisdiction and item type.
Sales tax can vary by city, county, and state, so using the correct rate makes the calculator more useful for real purchases.
When buying more than one item, the per-item total can make it easier to compare real cost across options.
Multiply the price by the sales tax rate to find the tax amount, then add that tax to the original price.
Divide the tax-included total by 1 plus the tax rate as a decimal to find the before-tax price.
Yes. This version includes a flat discount field so you can reduce the subtotal before calculating tax.
No. Actual sales tax rules can vary by location, product type, and whether discounts are taxed, so this calculator is best used as a general estimate.