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GST Calculator

Add or remove GST.

Add or remove GST. Free, no registration required.

Enter your details

Your result will appear here.

Results are estimates based on your inputs. Verify critical financial decisions independently.

How to use GST Calculator

Enter the requested values and choose the appropriate units; results update automatically. Results are generated locally in your browser. No account is required.

Formula & assumptions

Add tax: total = base × (1 + rate/100). Remove tax: base = total/(1 + rate/100).