Sales tax rates differ by state, city, and product category. Adding tax to a listed price prevents surprise at checkout when tags are pre-tax.
About Sales Tax
Sales tax rates differ by state, city, and product category. Adding tax to a listed price prevents surprise at checkout when tags are pre-tax.
Businesses must follow local tax law; this consumer tool approximates tax math for planning.
Not professional tax advice. Currency selection does not perform FX conversion.
How to use this tool
Input pretax amount and tax rate percent. Calculate for tax dollars and total with tax.
Formula & methodology
This sales tax calculator applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.
tax = subtotal x (rate/100); total = subtotal + tax
Worked example
A subtotal of 1,200 with 17% sales tax: tax = 1,200 × 0.17 = 204; total = 1,404. To work backwards from a tax-inclusive price, divide by 1.17 instead of subtracting 17%.
Tips for accurate results
Some regions tax only part of the basket (groceries exempt, etc.).
Use jurisdiction-specific rate tables for accuracy.
Tips may or may not be taxed depending on locale—separate from goods tax.
Keep receipts for business expense documentation.
Frequently asked questions
$100 with 8% tax?
Tax $8; total $108.
Tax advice?
No. Generic math only.
VAT inclusive pricing?
This tool adds tax to subtotal; inclusive VAT needs reverse calculation.
Free?
Yes.
Sources & references
The factors and formulas used by this tool follow these references:
Finance results are estimates based on the figures you enter and standard formulas. They are not tax, investment, or lending advice; actual bank terms, fees, and tax rules may differ.
Last reviewed: September 2026. Found an error? Tell us and we will correct it.
Further reading
Guides that explain the ideas behind this calculator.