GST Calculator (India)
Add or remove GST at 5%, 18% or any other slab in seconds.
Intra-state split: CGST ₹90 + SGST ₹90 (each 9%).
Results are estimates for information only, not financial advice. See how we build and verify our calculators.
Calculate GST both ways: add GST to a net amount to get the gross price, or remove GST from a GST-inclusive price to find the base amount. Pick a rate — 5% and 18% are the main slabs since the September 2025 rationalisation, with legacy 12%/28% and the 40% demerit rate also supported — and see the GST amount, the total, and the CGST/SGST split.
How to use the GST Calculator
- Enter the amount.
- Choose whether to add GST (amount is exclusive) or remove GST (amount is inclusive).
- Pick the GST rate.
- See the GST amount, total, and CGST/SGST breakdown.
Frequently asked questions
How do I remove GST from a total price?
Base amount = total ÷ (1 + rate/100). For example, to remove 18% GST from ₹1,180: 1180 ÷ 1.18 = ₹1,000 base, so GST is ₹180. Switch the tool to 'Remove GST' to do this automatically.
What is the CGST and SGST split?
For intra-state sales, GST is split equally into CGST and SGST. At 18%, that's 9% CGST + 9% SGST. The calculator shows this split for you.
Which GST rate should I use?
Most goods and services now fall in the 5% or 18% slab after the September 2025 rate rationalisation; a 40% rate applies to demerit goods like tobacco, pan masala and luxury cars. Check your item's HSN/SAC code to confirm.