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Free tool
GST Calculator
Add or remove GST instantly. Pick the rate, set intra/inter-state โ we'll show the CGST/SGST or IGST breakdown.
Base amount
Total GST
CGST (%)
SGST (%)
IGST (%)
Total payable
Need this on every invoice automatically? Get Ketpy Book โ
How it works
The math behind it.
- Add GST: Tax = Amount ร Rate% ยท Total = Amount + Tax
- Remove GST (inclusive): Base = Amount ร 100 / (100 + Rate) ยท Tax = Amount โ Base
- Intra-state (same state on both sides): GST splits 50/50 into CGST + SGST
- Inter-state (different states): full amount goes to IGST
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