GST Calculator

Calculate GST and a tax-inclusive total from an amount and a rate you choose.

Amount before GSTGST rate (%)

Result

GST: 180 Total including GST: 1,180

How gst calculator works

GST = amount before tax x GST rate / 100. Total = amount + GST.

Enter your values or text in the tool form.
Review the result as you change the inputs, or select the action button for code tools.
Copy the result or download it where a download option is available.

At an entered rate of 18%, a pre-tax amount of 1,000 has 180 GST and a total of 1,180.

The rate is user-supplied, not a live tax lookup. Check the current rate and exemptions for your item and jurisdiction.

How does gst calculator work?

GST = amount before tax x GST rate / 100. Total = amount + GST.

What should I check before using the result?

The rate is user-supplied, not a live tax lookup. Check the current rate and exemptions for your item and jurisdiction.

Is GST Calculator free to use?

Yes. GST Calculator is free, browser-based, and does not require signup.

Does this tool save my data?

Tool inputs are processed on your device. File tools do not upload your files. Website analytics are described in the privacy policy.

Can I use it on mobile?

Yes. The page is responsive and works on modern mobile, tablet, and desktop browsers.

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Reviewed 2026-10-24. By Mahad and Mehdi Developers.