GST Calculator

GST Calculator is a free tool that calculates goods and services tax to add to or remove from a price, with no sign-up required. It works instantly in your browser, making it easy for shoppers and business owners to check pricing on the go. Anyone who needs to quickly work out tax-inclusive or tax-exclusive amounts can use it to save time on manual math.

What is GST Calculator?

GST Calculator helps you work out how much goods and services tax applies to a given amount, based on the rate you enter. Since GST rates vary by country and region, the tool lets you input your local rate rather than assuming a fixed percentage. You can use it to add GST onto a base price, or to work backward from a tax-inclusive total to find the original pre-tax amount.

How to use GST Calculator

1. Enter the price amount and your applicable GST rate.
2. Choose whether you want to add GST or remove it from the amount.
3. Click calculate to see the tax amount and the final total.

Key features

• Supports both adding GST to and removing GST from a price.
• Works with any GST or tax rate you enter, suited to your region.
• Shows the tax amount separately from the total price.
• Provides instant results with no account required.

Related tools

Pair it with Sales Tax Calculator or Discount Calculator for more pricing calculations.

Frequently asked questions

Is GST Calculator free?

Yes, GST Calculator is completely free and requires no sign-up. You can use it as many times as needed for personal or business calculations.

What GST rate should I use?

You should enter the GST or tax rate that applies in your specific country or region, since rates vary widely worldwide. The calculator does not assume a fixed rate, so you stay in control of accuracy.

Can I calculate the pre-tax price from a total?

Yes, selecting the 'remove GST' option lets you enter a tax-inclusive total and work backward to the original pre-tax price. This is useful when reviewing receipts or invoices that only show the final amount.

Is this calculator suitable for business invoicing?

The calculator is a helpful estimation tool for quick GST calculations, but it is not a substitute for official accounting or tax software. For formal invoicing or tax filing, you should confirm figures with your accounting system or a tax professional.