Sales Tax Calculator
Know the real checkout price before you buy. Enter any item price and tax rate and this sales tax calculator shows the tax amount and the total you will actually pay.
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Estimate only. Tax rates vary by state, county, and city - enter the combined rate shown at checkout for your location.
How to use this calculator
Enter the item price and your tax rate as a percentage. The tax and total update instantly as you type.
For example, a $100 item at 8.875% carries $8.88 in sales tax, for a total of $108.88. Note that the rate you pay at checkout is usually the combined state, county, and city rate — enter that single combined figure.
How it works
Sales tax = price × (rate ÷ 100). Total = price + sales tax. The raw tax is rounded to the nearest cent: $100 × 8.875% is exactly $8.875, which rounds to $8.88 — the amount a register charges.
This tool only adds tax to a price. If you are a seller wondering whether you must collect tax in a state at all, see our sales tax nexus calculator for economic nexus thresholds.
Frequently asked questions
How is sales tax calculated?
Multiply the item price by the tax rate as a decimal: sales tax = price × (rate ÷ 100). A $100 item at 8.875% carries $8.88 of tax, for a $108.88 total.
Why is the tax amount rounded?
The raw math can produce fractions of a cent - $100 at 8.875% is exactly $8.875 - so it is rounded to the nearest cent ($8.88), which is what a register charges.
Should I enter the combined state and local rate?
Yes. The rate you pay at checkout is usually the state rate plus county and city taxes combined - enter that single total rate here.
Does this handle sales tax nexus?
No - this tool only adds tax to a price. For seller obligations and economic nexus thresholds by state, use our separate sales tax nexus calculator.