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AllgoTool directory
Calculate, convert and clean up your work.
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35 tools · No account required · Most work in your browser
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Calculators
GST Calculator: Add or Remove Tax
Add or remove a tax percentage from a price.
How to use the gst calculator: add or remove tax
- Enter the values or text requested by the tool.
- Choose the available options and run the tool.
- Review the result.
Worked example
Adding 18% to 1,000 gives 1,180. Removing included 18% tax from 1,180 gives a base price of 1,000.
Understanding the result
For an inclusive price, divide by 1 + rate ÷ 100. Enter the actual rate applicable to your transaction; the default is only an example.
Frequently asked questions
Does the tool identify the correct GST rate?
No. You choose the rate. The tool performs arithmetic and does not classify products or provide tax advice.
Is this GST calculator free to use?
Yes. This version of AllgoTool is free to use and does not require an account. The tool’s limits are explained above.
Supported inputs and limitations
Enter the rate that applies to your transaction. This is an arithmetic tool, not tax advice.
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