Total price
$108.25
8.25% tax on $100.00
Price before tax
$100.00
Tax amount
$8.25
Tax rates vary by region. Enter your local rate — this calculator does not apply jurisdiction-specific rules and is not tax advice.
Learn more
How this calculator works and what to know before using it
What this calculator does
Calculates sales tax on a price or extracts the pre-tax amount when tax is already included in the total.
How to use it
- Choose add-tax or tax-included mode.
- Enter the amount and tax rate (or tap a preset).
- View tax amount and final or pre-tax price.
Formula used
Percent of the price
Tax = price × (rate ÷ 100) · Pre-tax = total ÷ (1 + rate ÷ 100)
Source. Added tax is the price times the rate. A tax-included total is divided by 1 plus the rate. The rate is the one entered on the page.
Updated November 1, 2026
Example
$100 at 8.25% tax adds $8.25 (total $108.25). A $108.25 tax-included total at 8.25% implies $100 pre-tax.
Good to know
- Rates vary by country, state, province, and city.
- Some items may be exempt or taxed at reduced rates.
Common questions
- How do I find the pre-tax price when tax is included?
- Divide the tax-included total by (1 + tax rate ÷ 100). Example: $108.25 ÷ 1.0825 = $100 pre-tax at 8.25%.
- Do all products have the same sales tax rate?
- No. Groceries, clothing, and services may be taxed differently depending on your jurisdiction. Use your local rate.
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