GST Calculator

Calculate Goods and Services Tax (GST) with our easy-to-use GST calculator.

GST Calculator

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About This Tool

Our GST calculator helps you quickly determine the GST amount and the price including or excluding GST. This tool is useful for businesses, accountants, and consumers to calculate GST accurately.

Select the calculation type you need, enter the required values, and get immediate results to help you with your financial calculations.

Common Uses

  • Calculating the GST amount to add to a price
  • Determining the original price before GST was added
  • Figuring out the GST component in a price
  • Creating invoices with separate GST amounts
  • Comparing prices with and without GST

Formulas Used

Add GST:

GST Amount = Price Before GST × (GST Rate / 100)

Price Including GST = Price Before GST + GST Amount

Remove GST:

Price Before GST = Price Including GST / (1 + (GST Rate / 100))

GST Amount = Price Including GST - Price Before GST

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