GST Calculator
Work out GST both ways: add GST to a base price to get the invoice value, or strip GST out of a price that already includes it. The result also splits the tax into CGST and SGST, which is what you need for an intra-state invoice.
GST Calculator
How this calculator works
Adding GST: tax = amount × rate ÷ 100. Removing GST: base = amount × 100 ÷ (100 + rate), tax = amount − base.
- For sales within the same state, GST splits equally into CGST and SGST.
- For inter-state sales, the full amount is IGST instead.
- Common slabs are 5%, 12%, 18% and 28%; check the HSN/SAC code for your product or service.
Frequently asked questions
How do I remove GST from an inclusive price?
Divide the inclusive amount by (100 + rate) and multiply by 100. For example, ₹1,180 at 18% gives a base of ₹1,000 and GST of ₹180.
When is IGST charged instead of CGST and SGST?
IGST applies when the supplier and the place of supply are in different states or union territories. Within one state, the same total is split half as CGST and half as SGST.
Do I need GST registration?
Registration is mandatory once your turnover crosses the threshold for your state and business type, and in some cases regardless of turnover, such as inter-state supply of goods or e-commerce sales. Confirm on the official GST portal.
Disclaimer: results are estimates for planning only. Interest rates, tax slabs and government charges change — confirm the final figure with your bank, employer or the official government portal before you act on it.