How do I calculate sales tax?
Multiply the pre-tax amount by the tax rate percent divided by 100, then add that to the pre-tax amount for the total.
Sales Tax Calculator
Add sales tax to a pre-tax amount to see tax due and the customer’s total.
Enter pre-tax amount and rate
Provide the taxable amount before tax and the sales tax percentage.
About this calculator
How to use Sales Tax Calculator, plus the formulas and logic behind the results.
Tool description
Sales tax is typically a percentage of the taxable purchase price. Combined state/local rates vary by location.
How to use
- Enter the amount before sales tax.
- Enter your combined sales tax rate as a percent.
- Select Calculate to view tax and total.
- Confirm the rate for your city/county if needed.
Formulas & reference
Tax = pre-tax × (rate ÷ 100)Total = pre-tax + tax
Sales tax examples
- 7.25% of $100 = $7.25 tax; total $107.25
- Use combined state + local rate when applicable
- Some items may be exempt or taxed differently
- Need tax-inclusive totals? Try Reverse Sales Tax
Calculation logic
Applies a flat percentage to the pre-tax amount. Does not handle exemptions, caps, or multi-jurisdiction splits.
Rates differ by location and product type. This is an educational estimate, not a filing or remittance tool.
Sales Tax Calculator FAQ
Common questions about the calculation and how to interpret the estimate.
Where do I find my tax rate?
Check your state/local revenue department or a reliable rate lookup for the delivery or store address.
Is shipping taxable?
It depends on jurisdiction—confirm local rules; this tool taxes only the amount you enter.
Can I use a combined rate?
Yes. Enter the total percentage you must charge or pay.
What about VAT?
Use the VAT Calculator for net/gross VAT-style math common outside the US.
Is this tax advice?
No—educational only; remittance and nexus rules need a tax professional.