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.
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.