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GST Calculator: Add and subtract GST

Our GST calculator helps you quickly and efficiently calculate Goods and Services Tax (GST). Use the calculator to add or subtract GST from the price of a product.

Calculate your GST Amount

The Goods and Services Tax (GST), also known as VAT or Value Added Tax, is an integral part of purchases in Australia. Our GST Calculator streamlines the process of finding the product price before or after GST inclusion.

Use our GST Calculator to find the price of a product excluding GST or add GST to the price of a product:

The price already includes GST:
Price including GST Price excluding GST GST
Taxable good or service 90,00 10,00
The provided price is exclusive of GST:
Price excluding GST Price including GST GST
Taxable good or service 110,00 10,00


If you are enrolled for the Goods and Services Tax (GST) in Australia, or are obligated to be, the products and services you offer are typically subject to taxation, unless they fall under the categories of GST-free or input-taxed.

This tool is designed to assist you specifically when engaging in taxable sales, i.e., sales that include a 10 per cent GST component in the price.

For a sale to be considered taxable, it must meet the following criteria:

For a more comprehensive understanding of how the Goods and Services Tax (GST) operates, you can refer to the Australian Taxation Office website.

What is GST?

GST, or Goods and Services Tax, is a value-added tax applicable to most goods and services sold or consumed in Australia. Businesses registered for GST must incorporate the tax in their sales prices, collect it from customers, and remit it to the government.

What is the percentage of GST in Australia?

The GST rate in Australia is 10%, implemented on most goods and services, except for exemptions such as basic foods, certain medical and healthcare services, and specific educational courses. This tax was introduced on 1 July 2000.

Calculating GST

To calculate the Goods and Services Tax (GST), you can use the following methods:

Work out the price including GST

If you want to add GST to the existing price of a product or service, simply multiply the amount by 0.1 (or 10%). This gives you the amount to add on. Alternatively, if you want the total price, simply multiply the original price by 1.1 (110%).

Exclude GST from total amount

To work out how much GST is included in a total price, divide the price by 11. If you want the total price before GST was added, divide by 1.1.