GST calculator for India
Add GST to a price, or take GST out of a price that already includes it. Works for several items at once and splits the tax into CGST + SGST or IGST. Free, no sign-up.
- Taxable value
- ₹1,000.00
- CGST
- ₹90.00
- SGST
- ₹90.00
- Total with GST
- ₹1,180.00
Rates as notified from 22 September 2025. Last checked 14 October 2026. This tool does maths only; confirm the rate for your HSN code with your CA.
GST formulas
| You want | Formula | Example at 18% |
|---|---|---|
| GST to add | Price × rate ÷ 100 | ₹1,000 → GST ₹180, total ₹1,180 |
| Price before GST | Inclusive price × 100 ÷ (100 + rate) | ₹1,180 → ₹1,000 + GST ₹180 |
| CGST and SGST | GST ÷ 2 each | ₹90 CGST + ₹90 SGST |
GST rates in 2026
| Rate | Used for |
|---|---|
| 0% | Nil-rated and exempt goods |
| 0.25% | Rough diamonds |
| 3% | Gold and silver |
| 5% | Most everyday goods, including clothing and footwear up to ₹2,500 a piece |
| 18% | Standard rate for most other goods and services |
| 40% | Sin and luxury goods such as tobacco and aerated drinks |
More detail: new GST rates for retailers, reverse GST calculation and what a GST invoice must show.
Questions
How do I calculate GST on a price?
Multiply the price before GST by the rate and divide by 100. For ₹1,000 at 18%, GST is 1,000 × 18 ÷ 100 = ₹180, so the customer pays ₹1,180.
How do I remove GST from an inclusive price?
Divide the inclusive price by (100 + rate) and multiply by 100 to get the taxable value. For ₹1,180 at 18%, the taxable value is 1,180 × 100 ÷ 118 = ₹1,000 and the GST is ₹180.
What are the GST rates in 2026?
Since 22 September 2025 the two main GST rates are 5% and 18%. There is also a nil (0%) category, a 40% rate for sin and luxury goods, 3% for gold and silver and 0.25% for rough diamonds. The old 12% and 28% slabs were removed for most goods. Confirm the rate for your HSN code with your CA.
When do I charge CGST + SGST and when IGST?
If the buyer is in the same state as your shop, split the GST equally into CGST and SGST (for example 9% + 9% on an 18% item). If the buyer is in another state, charge the full rate as IGST.
Stop calculating GST by hand
RichPOS puts the right rate on every bill from the HSN on each item, and gives your CA GST reports by HSN. ₹199/month, free for 30 days.