Shopping & Money

GST Calculator India: Add or Remove GST (5%, 18%, 40%)

Free tool · Updated October 2, 2026 · By CouponTalk

Your result

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Quick answer

To add GST, multiply the price by (1 + rate): ₹1,000 + 18% GST = ₹1,180. To remove GST from an inclusive price, divide by (1 + rate): ₹1,180 ÷ 1.18 = ₹1,000. Within a state the GST is split equally into CGST and SGST; for inter-state sales it is charged as IGST.

How to use this calculator

Enter the amount.
Pick the GST rate that applies to the product or service.
Choose whether the amount already includes GST.

Formula

Add GST: Total = Amount × (1 + Rate ÷ 100)

Remove GST: Base = Total ÷ (1 + Rate ÷ 100)

Split: CGST = SGST = GST ÷ 2 (intra-state) · IGST = full GST (inter-state)

Results are estimates to help you plan. Confirm the final price, tax and offer terms at checkout.

Frequently asked questions

What are the GST rates in India now?

Since the GST rate rationalisation of September 2025, the main slabs are 5% and 18%, with 40% for luxury and sin goods, 0% for essentials and 3% for gold and silver. Check the official GST portal for your specific item.

How do I calculate GST from a total amount?

Divide the total by (1 + rate) to get the base price, then subtract. For ₹1,180 at 18%: ₹1,180 ÷ 1.18 = ₹1,000 base, so GST is ₹180.

What is the difference between CGST, SGST and IGST?

For sales within a state, GST is split equally between the Centre (CGST) and the state (SGST). For sales between states, the full amount is charged as IGST.