Sales Tax Calculator
Add sales tax to a price, or work backwards to find the tax already included in a total.
Mode
%
108.25
Gross priceNet price
92.4%
Sales tax
7.6%
- 1
Tax amount
100 × 8.25% ÷ 100 = 8.25 - 2
Total with tax
100 + 8.25 = 108.25
Formula
How this is calculated
The calculator works from two numbers: a price and a sales tax rate entered as a percentage. The rate is divided by 100 to turn it into a decimal multiplier, and how that multiplier is applied depends on the mode you choose.
In "Add tax" mode the price you enter is the net (pre-tax) amount. The tax is net × rate/100, and the gross total a customer pays is net + tax. In "Extract tax" mode the price you enter is the gross (tax-included) total. Because the tax was charged on the net amount and not on the gross, you recover the net by dividing the gross by (1 + rate/100); the tax is then simply gross − net.
The math assumes a single flat rate applied to the whole amount, with no tax-exempt portions, tiered brackets, rounding rules, or combined state and local jurisdictions baked in. Results are shown to two decimal places, and a rate of 0% leaves the price unchanged. Sales tax differs from VAT, which is collected at each production stage rather than once at final sale.
Examples
| Input | Result |
|---|---|
| Add 8.25% to $100 | Tax = $8.25, total = $108.25 |
| Extract 8.25% from $108.25 | Net = $100.00, tax = $8.25 |
About this calculator
Sales tax is a percentage added to the price of goods and services at the point of sale. In "Add tax" mode the calculator takes a pre-tax price and shows the tax amount and the final total a customer pays. In "Extract tax" mode it reverses the process to find how much of a tax-included price was the underlying net price versus the tax.
The extract mode is useful for receipts and bookkeeping where only the gross total and the rate are known. Because tax is calculated on the net amount, you cannot simply subtract the rate from the gross figure; the calculator divides by one plus the rate to recover the true pre-tax price.
Frequently asked questions
Divide the gross price by (1 + rate/100) to get the net price, then subtract that from the gross to find the tax. The extract mode does this automatically.
Sales tax is applied to the net price, not the gross total, so subtracting the rate from the gross figure overstates the net price. Dividing by one plus the rate gives the correct result.
They are similar consumption taxes but applied differently. Sales tax is charged once at the final sale, while VAT is collected at each stage of production. Use the VAT calculator for value-added tax.
Also known as
TG we-Calculate Editorial Team. (2026). Sales Tax Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/sales-tax-calculator
TG we-Calculate Editorial Team. "Sales Tax Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/sales-tax-calculator.
TG we-Calculate Editorial Team, "Sales Tax Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/sales-tax-calculator
@misc{wecalculate_sales_tax_calculator, title = {Sales Tax Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/sales-tax-calculator}}, year = {2026}, note = {TG we-Calculate} }
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