Add GST to a price or remove GST from a total. See the CGST, SGST and IGST split instantly.
How does a GST calculator work?
GST (Goods and Services Tax) is a tax added to the price of most goods and services in India. A GST calculator does the maths for you in two ways. Add GST starts from the price before tax and gives you the final price. Remove GST starts from a GST-inclusive price and gives you the price before tax.
GST formulas
Add GST: GST = Net amount × rate ÷ 100 · Total = Net + GST
Remove GST: Net amount = Total ÷ (1 + rate ÷ 100) · GST = Total − Net
Example
Add 18% GST to ₹10,000: GST is ₹1,800 and the total is ₹11,800. To go back, remove 18% GST from ₹11,800: the net amount is ₹11,800 ÷ 1.18 = ₹10,000.
GST rates in India
Under the GST 2.0 reform effective 22 September 2025, most goods and services now fall into the 5% or 18% slab. A 40% rate applies to specified luxury and sin goods, and essential or exempt items are taxed at 0%. The old 12% and 28% slabs were largely removed. A few special rates, such as 3% on gold, still apply. Rates can change, so always check the latest official notification or your invoice for the exact rate on an item.
CGST, SGST and IGST
- CGST and SGST: when you sell within the same state, the GST is split equally between the central government (CGST) and the state government (SGST).
- IGST: when you sell to another state, or import goods, the full GST is charged as IGST.
- The total GST amount is the same in both cases. Only the split changes.
Tips when using GST
- The MRP on packaged goods already includes GST. Use Remove GST to find the pre-tax price.
- Always put the correct GST rate on invoices. It must match the item’s classification.
- Keep GST bills if you are registered, because you may claim input tax credit.
Frequently asked questions
How do I calculate GST on a price?
Multiply the price by the GST rate and divide by 100 to get the GST amount. Add it to the price for the total. For example, 18% GST on ₹10,000 is ₹1,800, so the total is ₹11,800.
How do I remove GST from a total amount?
Divide the GST-inclusive amount by (1 + GST rate ÷ 100) to get the price before GST. For example, ₹11,800 with 18% GST becomes ₹11,800 ÷ 1.18 = ₹10,000. The difference is the GST.
What are the current GST rates in India?
Since the GST 2.0 reform on 22 September 2025, the main GST slabs in India are 5% and 18%, with 40% on specified luxury and sin goods, and 0% for exempt and nil-rated items. Special rates such as 3% on gold also apply. Rates can change, so check the latest official notification.
What is the difference between CGST, SGST and IGST?
For a sale within one state, GST is split equally into CGST (central) and SGST (state). For a sale between states or an import, the full GST is charged as IGST.
Is GST already included in the MRP?
Yes. The MRP printed on packaged goods is inclusive of all taxes, including GST. Use the Remove GST option to find the price before tax.
What is the difference between GST-exclusive and GST-inclusive price?
A GST-exclusive price is the amount before tax. A GST-inclusive price is the final amount after GST is added.
This calculator gives estimates for information only and is not tax advice. Confirm the correct GST rate for your product or service with the official GST notification or a tax professional.
