GST Calculator
Calculate GST amounts in real-time. Add GST to net prices or extract GST from gross amounts with instant CGST, SGST, and IGST tax splits across all standard tax slabs.
Same-state transactions split GST as CGST + SGST; interstate transactions use IGST at the full rate.
What is GST?
GST (Goods and Services Tax) is a single indirect tax applied to most goods and services sold in India, replacing the earlier patchwork of separate state and central taxes since it was implemented on July 1, 2017. It's charged as a percentage of the price, at a rate that depends on what's being sold.
Why use this calculator?
Sellers usually need to go from a base price to a GST-inclusive price; buyers or accountants often need the opposite — working backwards from a GST-inclusive total to find the base price and how much of that total was tax. This calculator does both directions, and shows the CGST/SGST or IGST split so the breakdown matches how the tax is actually billed on an invoice.
Worked Example — ₹10,000 at 18% GST
Common GST Rates in India
The standard slabs this calculator's preset chips use — confirm the actual rate for what you're billing rather than assuming 18%.
| Rate | Typical for |
|---|---|
| 0% | Exempt goods — unbranded food staples, books, fresh produce |
| 5% | Essentials and most items from the former 12% slab — packaged food, dairy, personal care |
| 18% | Standard rate — most goods and services, including most of the former 28% slab |
| 40% | Luxury and sin goods — large cars, aerated drinks, betting and casinos |
Some categories fall outside these five slabs — gold and gold jewellery, for example, are taxed at 3%, not one of the preset chips. Type the rate directly into the GST Rate field for any rate not shown as a chip.
Common Mistakes to Avoid
- Don't apply the rate to a GST-inclusive amount. If your number already includes GST, use Remove GST — multiplying an inclusive amount by the rate directly double-counts the tax already baked in.
- CGST + SGST and IGST are the same total tax, not extra tax. Within-state splits the GST amount evenly into CGST and SGST; inter-state charges the identical total as one IGST line. Switching the toggle changes the breakdown, not the amount you pay.
- Not everything is 18%. 18% is the most common slab, but essentials can be 0% or 5%, and luxury/sin goods are taxed at 40% (the 12% and 28% slabs were removed in September 2025) — always confirm the actual rate for what you're billing, don't assume the default.
References
- Central Board of Indirect Taxes and Customs (CBIC)
- Goods and Services Tax Council, Government of India
Last reviewed July 2026