GST Calculator (India)
Use our free GST Calculator to add or remove GST on any amount. Get the base price, GST amount, CGST and SGST split, and final total for 5%, 12%, 18%, and 28% slabs — instant, accurate, and made for India.
CGST and SGST apply to intra-state sales (split equally). For inter-state sales the same total is charged as IGST. Calculations run in your browser.
How the GST Calculator Works
- Enter the amount
- Choose a GST rate (5%, 12%, 18%, 28%, or custom)
- Pick Add GST (exclusive) or Remove GST (inclusive) to see the full breakdown
Features
- Add or remove GST instantly
- All slabs: 5%, 12%, 18%, 28% + custom rate
- CGST / SGST split shown automatically
- Works in your browser — no signup
Use Cases
FAQs
How do I add GST to an amount?
Enter the base amount, choose the GST rate, and select “Add GST”. The tool shows the GST amount and the final price including GST.
How do I remove GST from a total?
Enter the GST-inclusive amount, choose the rate, and select “Remove GST”. The tool back-calculates the base price and the GST included in that total.
What is the CGST and SGST split?
For intra-state sales, total GST is split equally into CGST and SGST (half each). For inter-state sales the same total is charged as IGST.
Which GST rates does it support?
It supports the standard Indian slabs — 5%, 12%, 18%, and 28% — plus any custom rate you enter.