How do I calculate GST backwards from a total?

To extract GST from a GST-inclusive amount, divide the amount by (100 + rate) and multiply by the rate. This reverse GST calculator does it instantly for 5%, 12%, 18% and 28%.

Is GST split into CGST and SGST?

For intra-state sales, GST is split equally into CGST and SGST (e.g. 18% = 9% CGST + 9% SGST). For inter-state sales it is charged as IGST.

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Free Tool

Reverse GST Calculator

Add GST to a net amount, or extract GST from a GST-inclusive total. Splits into CGST + SGST automatically.

Amount (₹)

GST rate

Amount type

Base amount₹0

CGST (9%)₹0

SGST (9%)₹0

Total₹0

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Reverse GST Calculator

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