Sales Tax Calculator
Calculate sales tax for purchases in the USA.
Inputs
Result
Enter values on the left and select Equals to see the result here.
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What the Sales Tax Calculator does
- Computes sales tax from a purchase amount and tax rate.
- Outputs tax amount and total amount after tax.
How to use the Sales Tax Calculator
- Enter the purchase amount.
- Enter your combined sales tax rate (state + local).
- Optionally choose a state (placeholder for future auto-rates).
- Click Calculate.
Formula / methodology used
- Tax = amount × (rate ÷ 100).
- Total = amount + tax.
Example calculation
$80 purchase at 8.25% tax.
- Tax = 80 × 0.0825
- Total = 80 + tax
Result: Tax = $6.60, Total = $86.60
Sales Tax Calculator FAQs
Why doesn’t the state auto-fill the rate?
Rates vary by city/county. This version uses manual entry, but the structure supports state-based rates later.