Sales Tax Calculator
Add sales tax to a price, or extract it from a total.
Quick answer
- Formula: Add: Tax = Price × rate, Total = Price + Tax · Extract: Net = Total ÷ (1 + rate)
- Worked example — Net price (before tax): $100.00 (full example below).
Sales Tax Calculator
| Net price (before tax) | $100.00 |
| Tax amount | $8.00 |
| Total price (with tax) | $108.00 |
$100 plus 8% tax is $108 total, $8 of it tax. In extract mode, a $108 total at 8% splits into $100 net + $8 tax.
Two jobs in one tool: add a tax rate to a pre-tax price, or — with the mode switched — work backwards from a tax-inclusive total to find the net price and the exact tax portion.
The formula
Worked example
$100 plus 8% tax is $108 total, $8 of it tax. In extract mode, a $108 total at 8% splits into $100 net + $8 tax.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
What sales tax rate should I use?
Combined state + local rates in the US range from 0% to over 10%. Enter the rate printed on a recent receipt for your area if you are unsure.
Is VAT handled the same way?
Yes — VAT is calculated with the same math. Use extract mode to find the VAT content of a VAT-inclusive price.
Category: Finance calculators
Sources & methodology
This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.
Content last reviewed by CalcHub Editorial.
Embed this calculator on your site
Free to use with attribution — paste the snippet below and the calculator appears on your page, with a link back to CalcHub.