GST Calculator
Add GST to a base price or pull it out of an inclusive price, with the CGST / SGST split.
Total amount
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How the GST calculator works
GST (Goods and Services Tax) is added on top of the base price of most goods and services in India. This calculator does two jobs: add GST to a pre-tax amount, or remove GST from a tax-inclusive amount to find the original base price.
Add GST: Total = Base × (1 + rate/100) Remove GST: Base = Total × 100 / (100 + rate)
The current GST slabs (GST 2.0)
Since the GST 2.0 reform of 22 September 2025, India uses mainly two rates — 5% and 18% — plus a 40% rate for luxury and sin goods, and 0% on some essentials. This replaced the earlier 5/12/18/28 structure. 18% remains the standard rate for most goods and services.
CGST and SGST
For a sale within a state, GST is split equally into CGST (central) and SGST (state) — so 18% = 9% + 9%. For sales between states it's a single IGST instead. This calculator shows the CGST/SGST split for intra-state transactions.
Who uses this
- Shoppers checking how much tax is inside a price.
- Freelancers & small businesses working out what to charge or invoice.
- Anyone reverse-calculating the base price from a final bill.
Frequently asked questions
What are the GST slabs in India?
Since the GST 2.0 reform on 22 September 2025, India uses mainly two rates — 5% and 18% — plus a 40% rate for luxury and sin goods (and a few essentials at 0%). This replaced the earlier 5%, 12%, 18% and 28% structure. 18% is the standard rate for most goods and services.
What does "add GST" vs "remove GST" mean?
Add GST starts from a base (pre-tax) amount and adds tax on top. Remove GST starts from a final (tax-inclusive) amount and works backwards to find the base amount and the tax inside it.
How is GST removed from an inclusive amount?
Base amount = Inclusive amount × 100 / (100 + GST rate). The GST is then the difference between the inclusive amount and the base amount.
What is CGST and SGST?
For sales within a state, GST is split equally into CGST (central) and SGST (state) — so 18% = 9% + 9%. For inter-state sales it is a single IGST.