GST Calculator
Add GST to a base price, or extract GST from a GST-inclusive price.
How GST math works
Adding GST: GST = base × rate ÷ 100, final = base + GST.
Removing GST (reverse GST): base = inclusive price ÷ (1 + rate/100). The GST component is the difference.
For intra-state sales the GST is split equally into CGST and SGST. For inter-state sales the full amount is IGST.
FAQ
How do I remove 18% GST from a bill?
Divide the inclusive amount by 1.18. Example: ₹1,180 inclusive ÷ 1.18 = ₹1,000 base + ₹180 GST.
What are the current GST slabs?
The main slabs are 0.25%, 3%, 5%, 12%, 18% and 28% plus cess on luxury/sin goods. Slab assignments change with GST Council decisions — always confirm on gst.gov.in for a specific product.
CGST, SGST, IGST — what's the difference?
CGST + SGST apply within a state (split between Centre and State). IGST is the single tax on inter-state supplies, collected by the Centre.