GST Calculator
Add or extract GST at any slab, with the CGST/SGST split shown.
Breakdown
About this tool
This GST calculator works in both directions: add GST on top of a base amount, or extract the tax already contained in an inclusive price. It shows the CGST and SGST split for every slab (5%, 12%, 18%, 28%), which is what you need when raising an intra-state invoice or checking a vendor bill. Results update instantly and the full breakdown copies to your clipboard in one click.
Frequently asked questions
Why is GST split into CGST and SGST?
For sales within one state, GST is shared equally between the central government (CGST) and state government (SGST). An 18% GST charge appears as 9% CGST plus 9% SGST on the invoice.
How do I remove GST from a price that already includes it?
Choose Extract GST. For example, ₹1,180 at 18% extracts to ₹1,000 net and ₹180 tax, calculated as amount × 100 ÷ (100 + rate).
Which GST slab applies to my product or service?
Slabs are set by the GST Council per category. Most services fall under 18%. Check the official CBIC rate finder for your specific HSN or SAC code.