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Sales Tax Calculator

Add sales tax, VAT or GST to a pre-tax price, or work backwards from a tax-inclusive total to find the price before tax and the tax amount.

Price before tax–
Tax–
Total with tax–

Results are calculated in your browser from the numbers you enter. Nothing is uploaded or stored.

How to use the Sales Tax Calculator

  1. Enter the amount and the tax rate.
  2. Choose whether to add tax to the amount or remove it from a tax-inclusive total.
  3. Read the price before tax, the tax and the total.

Adding tax

Tax = amount × rate ÷ 100, and the total is the amount plus the tax. At 8.25%, a price of 100 has 8.25 of tax and a total of 108.25.

Removing tax from a total

If a total already includes tax, divide it by (1 + rate ÷ 100) to get the price before tax. A total of 108.25 at 8.25% divides to 100.00, so the tax portion is 8.25. Do not simply subtract the rate from the total: 8.25% of 108.25 is not the same as the tax that was added.

Sales tax, VAT and GST

These are all consumption taxes shown as a percentage of price. Sales tax is usually added at the till in the USA, while VAT and GST are normally included in displayed prices in many other countries. Rates differ by country, state and product type, so check the rate that applies to you.

Frequently asked questions

How do I add sales tax to a price?

Multiply the price by the tax rate divided by 100, then add the result to the price.

How do I remove VAT or GST from a price?

Choose 'Amount already includes tax' and enter the rate. The calculator divides the total by 1 plus the rate.

Which tax rate should I use?

Use the rate that applies to your location and product. This site does not store tax rates, because they change and vary between regions.

Is this tax advice?

No. It is a calculator for quick estimates. Confirm the correct rate and treatment with your tax authority or an accountant.

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Last updated: November 6, 2026