Calculate Sales Tax Instantly
This free sales tax calculator adds tax to any price and shows you the total in real time. Enter the amount and your local tax rate above, and you will see exactly how much tax is added and what the final total comes to — perfect for shopping, invoicing, budgeting, and bookkeeping.
How to Use the Sales Tax Calculator
- Enter the amount (the pre-tax price).
- Enter your sales tax rate as a percentage (for example, 7.5).
- Press Calculate to see the tax amount and the total with tax.
How to Calculate Sales Tax by Hand
Multiply the amount by the tax rate (as a decimal) to get the tax, then add it to the original amount:
Tax = Amount × (Rate ÷ 100)
Total = Amount + Tax
For example, a $100 purchase at a 7.5% tax rate: 100 × 0.075 = $7.50 in tax, for a total of $107.50. A $45 item at 6% tax adds $2.70, for a total of $47.70.
Sales Tax Examples
| Amount | Tax rate | Tax | Total |
|---|---|---|---|
| $25 | 6% | $1.50 | $26.50 |
| $50 | 7% | $3.50 | $53.50 |
| $100 | 7.5% | $7.50 | $107.50 |
| $250 | 8.25% | $20.63 | $270.63 |
Why Sales Tax Rates Vary
In the United States, sales tax is set at the state and often the local level, so the rate you pay depends on where you are. Combined state-and-local rates commonly range from around 0% in a few states to over 9% in some cities. Because of this, it helps to calculate tax with the exact rate for your location rather than assuming a flat number. This calculator lets you enter any rate, so it works anywhere — for in-store purchases, online orders shipped to your address, or estimating tax on an invoice.
Frequently Asked Questions
How do I calculate sales tax?
Multiply the price by the tax rate as a decimal. $100 at 7.5% = 100 × 0.075 = $7.50 tax, total $107.50.
How do I find the pre-tax price from a total?
Divide the total by (1 + rate). A $107.50 total at 7.5% tax was $107.50 ÷ 1.075 = $100 before tax.
Is the sales tax calculator free?
Yes — free, browser-based, and no signup required.
Working Backwards From a Total
If you have a receipt total that already includes tax and want to know the pre-tax amount, divide the total by one plus the tax rate. A $107.50 total at a 7.5% rate was $107.50 ÷ 1.075 = $100 before tax, meaning $7.50 was tax. This “reverse sales tax” calculation is useful for expense reports, reimbursements, and separating tax on a receipt for bookkeeping.
Why Your Rate May Differ
Sales tax in the U.S. is layered: a state rate plus county and city rates that vary from one zip code to the next. Two stores a few miles apart can charge different totals on the same item. Online orders are generally taxed based on the shipping address. Because the combined rate is what matters, it is best to look up the exact rate for the location and enter it above rather than relying on a rough average.
Sales Tax vs. VAT
Outside the U.S., many countries use a value-added tax (VAT) or goods-and-services tax (GST) that is usually included in the displayed price, whereas U.S. sales tax is typically added at checkout. The math in this tool works for any of them: enter the amount and the rate, and you get the tax and total. For VAT-inclusive prices, use the reverse calculation above to separate the tax that is already baked into the price.
Keeping Track of Sales Tax
If you are self-employed or run a small business, separating sales tax from the base price matters for bookkeeping and tax filing. Keep receipts and record the tax portion of each purchase so it is easy to total at the end of a quarter or year. For sellers, knowing the exact tax to collect keeps you compliant and avoids surprises at filing time. Because rates differ by location and occasionally change, it is worth confirming the current rate for your area rather than relying on memory — then enter it above for an accurate tax and total every time.
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