mahinova How to use
- Type the amount.
- Pick the GST rate. 5% and 18% are the main slabs now.
- Choose whether the amount is without GST or already includes GST.
- Choose same state or other state to see CGST + SGST or IGST.
GST formulas
Adding GST: GST = Amount × Rate ÷ 100. Total = Amount + GST.
Removing GST: Amount before GST = Total × 100 ÷ (100 + Rate). GST = Total − Amount before GST.
Example: ₹1,180 including 18% GST → 1180 × 100 ÷ 118 = ₹1,000 before GST, and ₹180 GST (₹90 CGST + ₹90 SGST).
GST rates after GST 2.0
| Rate | Used for (examples) |
|---|---|
| 0% | Fresh food, milk, many essentials, health and life insurance |
| 5% | Daily-use items, many packaged foods, restaurant service |
| 18% | Most goods and services, electronics, small cars |
| 40% | Luxury and sin goods such as tobacco and big cars |
| 3% / 0.25% | Gold and silver / rough diamonds |
The 12% and 28% slabs were merged into these from 22 September 2025. They are still in the list for checking older bills. Always confirm the rate for your HSN code.
Frequently asked questions
How do I calculate 18% GST on ₹1,000?
₹1,000 × 18 ÷ 100 = ₹180 GST, so the total is ₹1,180. Within a state that is ₹90 CGST and ₹90 SGST.
How do I remove GST from a price?
Choose "Price with GST". The tool divides by (100 + rate) and multiplies by 100 to find the price before GST.
When is IGST charged instead of CGST and SGST?
When the seller and the buyer are in different states, or for imports. The rate is the same; only the split changes.
What are the new GST rates?
Since 22 September 2025, the main rates are 5% and 18%, with 40% for luxury and sin goods.