Sales Tax Calculator

What is sales tax?

Sales tax is an amount added to the price of certain goods and services. The sales tax calculator estimates that amount by multiplying the pre-tax price by the combined state and local tax rates.

State rates apply across a state, while local rates can differ by location. This calculator uses the population-weighted average local rate for the selected state as of July 1, 2026. That makes the result useful for planning, but it may not match the rate at a particular checkout.

Why sales tax matters

For a household, tax changes what you will pay at checkout. Estimating it before a large purchase can help you compare the full cost of options and avoid planning around the pre-tax sticker price.

For a business, tax affects customer-facing prices and the amount collected at sale. Include an estimate when reviewing a quote or planning a purchase, but verify the correct rate and tax treatment for the transaction before collecting or reporting tax. Consider asking a tax professional to confirm how the rules apply to your business.

How to use this sales tax calculator

1. Enter the price before tax.
2. Select the state where you want to estimate the purchase.
3. Review the estimated sales tax and total. The calculation adds the state rate to the local rate used, then applies the combined rate to the price.
4. Use the result as a planning estimate. For a purchase or sale that needs an exact amount, check the rate for the actual location and confirm whether the item or service is taxable.

Sales tax calculator example

How to read your sales tax result

Sales tax is the estimated amount added to the pre-tax price. Total is the pre-tax price plus that tax. The state rate shows the state portion, and local rate used shows the local estimate included in the calculation.

If the result differs from a receipt or quote, check the exact location, the rate in effect there, and whether the purchase is taxable. The calculator uses an average local rate, not an address-specific rate.

How to use the estimate to plan better

1. 01

   Compare total prices

   When comparing products or quotes, compare the estimated total with tax rather than relying only on the pre-tax price. This can help you choose an option that fits your spending plan.

2. 02

   Review business quotes

   If you sell taxable goods or services, show customers clearly whether a quote includes tax. Check the transaction’s location and tax treatment before setting the amount to collect.

3. 03

   Keep estimates separate from filings

   Use this calculator for a quick estimate, not as a substitute for records or tax reporting. Keep transaction details and confirm applicable requirements with a qualified tax professional.

Common sales tax calculator mistakes

• Treating the average local rate as exact

  Local rates vary by location. The calculator’s population-weighted state average is a planning estimate, not a guarantee of the rate at a particular address.

• Entering a price that already includes tax

  The price field is for the amount before tax. If you enter a tax-inclusive total, the estimate will add tax again.

• Assuming every purchase is taxable

  Tax treatment can depend on the item, service and location. Confirm whether the specific transaction is taxable instead of relying on the estimate alone.

The sales tax formula

Key terms

Pre-tax price

The price before sales tax is added.

State rate

The sales tax rate set at the state level.

Local rate

The local sales tax rate. This calculator uses a population-weighted average for the selected state.

Total with tax

The pre-tax price plus the estimated sales tax.