luckpandaHow to use the GST calculator
- Choose Add GST for a price before tax, or Remove GST for a price that already includes it.
- Enter the amount in rupees.
- Pick the GST rate for your goods or service, or enter a custom rate.
- Choose same state (CGST + SGST) or another state (IGST) and read the split.
The GST formula, with worked examples
Adding GST to a price: GST = amount × rate ÷ 100, and the total = amount + GST.
Removing GST from an inclusive price: amount before GST = inclusive price × 100 ÷ (100 + rate), and GST = inclusive price − amount before GST. Dividing the inclusive price by the rate alone is a common mistake: 18% of ₹11,800 is ₹2,124, not the ₹1,800 of GST it contains.
| Amount before GST | Rate | GST | Total including GST |
|---|---|---|---|
| ₹1,000 | 5% | ₹50 | ₹1,050 |
| ₹10,000 | 18% | ₹1,800 | ₹11,800 |
| ₹2,50,000 | 3% | ₹7,500 | ₹2,57,500 |
| ₹5,00,000 | 40% | ₹2,00,000 | ₹7,00,000 |
GST rates from 22 September 2025
The GST Council's rate rationalisation, often called GST 2.0, replaced the 5%, 12%, 18% and 28% structure with two main slabs and one special rate. This table is a summary to help you pick a rate in the calculator, not a rate schedule: the rate that applies is the one notified for your HSN (goods) or SAC (services) code.
| GST rate | Typical goods and services (examples) |
|---|---|
| 0% (nil or exempt) | Fresh unpacked food staples, UHT milk, paneer, Indian breads, individual life and health insurance, most education and healthcare services |
| 0.25% | Rough diamonds, precious and semi-precious stones |
| 3% | Gold, silver and jewellery |
| 5% | Everyday packaged foods and household items, medicines, fertilisers, hotel rooms up to ₹7,500 a night, and most items that were at 12% |
| 18% | The standard rate: most services (professional, IT, consulting), electronics and appliances, cement, small cars and two-wheelers up to 350 cc, and most items that were at 28% |
| 40% | Pan masala, aerated and caffeinated drinks, larger cars, motorcycles above 350 cc, yachts and private aircraft, betting and online money gaming |
CGST, SGST and IGST
GST is one tax with three heads, and which heads you charge depends on the place of supply, not on where you are registered alone.
- Within the same state: CGST + SGST, each half the rate. At 18%, that is 9% CGST and 9% SGST.
- Within a Union Territory without a legislature (such as Chandigarh or Ladakh): CGST + UTGST, each half the rate.
- To another state or Union Territory: IGST at the full rate.
- Imports, and exports or supplies to SEZ units: IGST (exports are often zero-rated under a bond or LUT).
Put the result on a GST invoice
A tax invoice needs your GSTIN, the buyer's GSTIN for B2B sales, the HSN or SAC code, the taxable value, the rate and amount of each tax head, and the place of supply. The free GST invoice generator works the same CGST, SGST or IGST split out per line as you type.