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Sales Tax Calculator

Calculate sales tax, pre-tax price, and total cost based on a purchase amount and tax rate.

Your Details

Calculation mode

Choose whether you want to add tax to a pre-tax price or remove tax from a tax-inclusive total.

Overview

This Sales Tax Calculator helps you quickly add sales tax to a pre-tax price or remove tax from a total amount that already includes tax. Enter the amount and tax rate, then choose whether you want to calculate the tax on top of a price or find the pre-tax price from a tax-inclusive total.

How it works

When adding tax, the calculator multiplies the pre-tax amount by the tax rate to find the tax, then adds it to the original price. When removing tax, it divides the tax-inclusive total by 1 plus the tax rate to find the pre-tax amount, then subtracts that from the total to find the tax portion.

How to use this calculator

  1. 1Choose whether you want to add tax or remove tax.
  2. 2Enter the amount you know.
  3. 3Enter the sales tax rate as a percentage.
  4. 4Review the pre-tax amount, sales tax, and total amount.

Example Calculation

Calculation mode

addTax

Amount

$100

Sales tax rate

8%

Pre-tax amount

N/A

A $100 pre-tax purchase with 8.25% sales tax gives $8.25 in tax and a total of $108.25.

Frequently asked questions

What does this Sales Tax Calculator estimate?

It estimates the sales tax amount, the pre-tax price, and the final total based on the amount entered and the tax rate.

Can I use this calculator to remove tax from a total price?

Yes. Select the option to remove tax, enter the total including tax, and the calculator will estimate the pre-tax amount and tax portion.

Does this calculator work for any sales tax rate?

Yes. You can enter any tax rate from 0% to 100%, though real-world rates are usually much lower.

Why might my receipt total be slightly different?

Some retailers apply item-level rounding, special local taxes, or exemptions, which can cause small differences from a simple estimate.

Does this calculator include discounts or shipping?

No. It only calculates based on the amount and tax rate you enter, so include any discounts or extra charges in your amount if needed.

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Assumptions and warnings

Assumptions

  • The tax rate entered applies uniformly to the full amount.
  • The calculator assumes a single sales tax rate with no exemptions or tiered rules.
  • Results are estimates and may differ slightly due to local rounding practices.
  • Discounts, shipping charges, and other fees are not included unless already included in the amount entered.

Warnings

  • Sales tax rules and rounding methods can vary by state, city, or country.
  • Check local tax requirements for exact amounts on real transactions.