GST Calculator — India
Add or remove GST instantly with a full CGST / SGST / IGST split.
Base price before tax
Intra-state splits into CGST + SGST; inter-state is IGST.
How the GST calculator works
Enter any amount and pick a GST slab. In Add GST mode the tool adds tax on top of your base price; in Remove GST mode it works backwards from a GST-inclusive price to show the base value and the tax hidden inside it. It also splits the tax into CGST + SGST for sales within your state or IGST for inter-state sales, so your invoices stay compliant.
Once your numbers are set, generate a proper bill with the GST invoice generator, or check what you actually keep with the profit margin calculator.
Frequently asked questions
How do I remove GST from a price that already includes it?
Switch the calculator to "Remove GST (inclusive)" mode and enter the final price. It back-calculates the base amount as price ÷ (1 + rate/100) and shows the GST component separately. For example, ₹1,180 at 18% has a base of ₹1,000 and ₹180 GST.
What is the difference between CGST, SGST and IGST?
For sales within the same state, GST is split equally into CGST (central) and SGST (state) — 18% becomes 9% + 9%. For inter-state sales, the full rate is charged as IGST. This calculator shows both breakdowns so you can invoice correctly.
Which GST slab applies to my product?
Common slabs are 5%, 12%, 18% and 28%, with 0% for exempt goods. Most apparel, electronics accessories and services fall under 12% or 18%. Check your product’s HSN code on the GST portal for the exact rate.
Is my data saved anywhere?
No. Every calculation runs entirely in your browser. Nothing is uploaded, logged or stored, so you can use it freely for client or business figures.
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