Financial Calculators
Sales Tax Calculator
Quickly add or remove sales tax from any amount. Choose your US state to auto-fill the tax rate, or enter a custom rate. Supports multi-item quantity calculations.
Amount & Tax Rate
Calculation Mode
US State Quick-Pick
Rates shown are state base rates. Local rates may apply.
Total with Tax
$108.50
Tax: $8.50 @ 8.5%
Pre-Tax Amount
$100.00
Tax Amount
$8.50
Total Amount
$108.50
Tax Rate
8.5%
Breakdown
How to add sales tax
To add tax: Total = Price × (1 + Tax Rate). For example, a $100 item with 8.5% tax = $100 × 1.085 = $108.50.
How to remove sales tax (reverse calculation)
To find the pre-tax price from a tax-inclusive total: Pre-Tax = Total ÷ (1 + Tax Rate). For example, $108.50 ÷ 1.085 = $100.00.
US State Sales Tax Rates
State base tax rates range from 0% (Alaska, Delaware, Montana, New Hampshire, Oregon) to 7.25% (California). However, counties and cities often add additional local tax on top of the state rate — so your effective rate may be higher than what is shown.
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