Everyday money

Sales Tax Calculator

Estimate the tax amount and final purchase price from the pretax price, local rate and quantity.

Local rates, exemptions and product-specific rules may differ. Confirm the applicable rate for the transaction.

Sales-tax calculation

Multiply the taxable subtotal by the tax rate expressed as a decimal, then add the tax to the subtotal. Some locations combine state, county and city rates.

Why the checkout amount may differ

  • Some products or services may be exempt
  • Shipping and discounts may be treated differently
  • Marketplace and destination rules can affect the rate
  • Rounding may occur per item or per transaction
Discount CalculatorPercentage Calculator

Educational estimate only; not tax advice.

Published by RVR — Founder & Editor, IQlatorMethodology reviewed September 24, 2026Educational information

Calculate sales tax while recognizing local rules

Sales tax is generally calculated by multiplying the taxable price by the applicable rate. The correct rate and taxable base depend on jurisdiction, product, service, exemptions and sourcing rules. A calculator can verify arithmetic but cannot determine legal tax treatment from price alone.

How to use this page

Convert the percentage rate to a decimal, multiply by the taxable amount, and add the result to obtain the total. To reverse a tax-inclusive total, divide by one plus the tax rate before calculating the tax component.

Practical exampleAt a 6% rate, tax on a $100 taxable purchase is $6 and the total is $106. If delivery or fees are taxable locally, include them in the taxable base.

Inputs to verify

  • Confirm state, county, city and special-district rates.
  • Check whether the item or buyer qualifies for an exemption.
  • Use the transaction date because rates and rules can change.

Common questions

Can this calculator find my exact local rate?

Only when a reliable location-specific source is connected. Otherwise enter the official combined rate.

Why does a receipt differ by a cent?

Retail systems may round per item or on the final taxable subtotal.

Methodology and sources: Arithmetic tool only. Consult the applicable revenue authority for legal taxability and rates.