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GST calculator

Add GST to a price, or take GST out of an inclusive price. Shows the CGST and SGST split for sales within your state, and IGST for sales to another state.

What do you want to do?
GST rate
Where is the customer?
Total including GST
₹0
Make a GST invoice

How the GST calculator works

Adding GST to a price before tax:

GST amount = Price × Rate ÷ 100
Total = Price + GST amount

Example: ₹1,000 at 18% → GST ₹180 → total ₹1,180. Within the same state this is split into CGST ₹90 and SGST ₹90. To another state it is IGST ₹180.

Removing GST from a price that already includes it:

Price before GST = Inclusive price ÷ (1 + Rate ÷ 100)
GST amount = Inclusive price − Price before GST

Example: ₹1,180 including 18% → price before GST ₹1,000 → GST ₹180. A common mistake is to take 18% of ₹1,180 (₹212.40). That is wrong, because the 18% was charged on ₹1,000, not ₹1,180.

Current GST rates at a glance

From 22 September 2025, GST 2.0 simplified the main slabs to 5% and 18%, with 40% for specified luxury and sin goods and 0% for many essentials. Special rates such as 3% on gold and silver and 0.25% on rough diamonds continue. The rate for a product depends on its HSN or SAC code. Read our GST basics guide for details.

The custom rate box is there for invoices issued before the change, which may still show the old 12% and 28% rates.

Questions about GST calculation

How do I calculate 18% GST on an amount?

Multiply the amount by 0.18 for the GST, or by 1.18 for the total. On ₹2,500 the GST is ₹450 and the total is ₹2,950.

How do I find the GST included in an MRP?

Divide the MRP by 1 plus the rate. For an 18% item with an MRP of ₹590, the price before GST is 590 ÷ 1.18 = ₹500, so the GST included is ₹90.

When do I charge CGST and SGST instead of IGST?

Charge CGST plus SGST, each at half the rate, when the place of supply is in the same state as you. Charge IGST at the full rate when the place of supply is in another state.

Can a composition dealer use this calculator?

Composition dealers do not charge GST to customers. They pay a fixed percentage of turnover instead. You can still use the calculator to work out the GST inside the prices you pay to suppliers.

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