Free tools › GST calculator
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GST calculator

Add or remove GST at any rate — with the CGST + SGST (or IGST) split. Reverse GST from an inclusive price too.

Runs offline — nothing you type leaves your device.
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Questions

How do I remove GST from a price (reverse GST)?

Pick "Remove GST", enter the GST-inclusive amount and the rate — you get the base price and the GST included. Base = amount ÷ (1 + rate/100).

What's the CGST/SGST split?

A sale within your state splits GST equally into CGST + SGST (half each). A sale to another state is one IGST at the full rate.

Is it free?

Completely free, no login — it runs in your browser.