GST Calculator

Work out the GST on any invoice in seconds. Enter an amount, pick the rate, and see the tax, the CGST/SGST split and the final price.

GST rate
This amount is
Supply type

Total amount (incl. GST)

₹0

Enter an amount to see the breakdown.

  • Net amount₹0.00
  • Total GST (18%)₹0.00
  • CGST (9%)₹0.00
  • SGST (9%)₹0.00
  • Total amount₹0.00

How to use this calculator

  1. Choose the GST rate that applies to your product or service.
  2. Type the amount. Tell us whether it already includes GST or not.
  3. Pick same state for CGST + SGST, or other state for IGST. The breakdown updates as you type.

Formulas we use

Adding GST GST = Amount × Rate ÷ 100
Total = Amount + GST
Removing GST Net = Amount × 100 ÷ (100 + Rate)
GST = Amount − Net

Frequently asked questions

What is the difference between CGST, SGST and IGST?

When you sell within the same state, GST is split equally into Central GST (CGST) and State GST (SGST). For example, 18% GST becomes 9% CGST and 9% SGST. When you sell to a buyer in another state, the full rate is charged as Integrated GST (IGST).

What does "with GST" mean?

Choose "With GST" when the price you have already includes tax, like an MRP or a final quote. The calculator works backwards to show the original price and how much of it is GST.

Which GST rate should I choose?

The rate depends on the HSN code of the goods or the SAC code of the service. Check the latest rate notified by the GST Council for your category, or confirm with your accountant.

Is this calculator free?

Yes. It runs entirely in your browser, needs no sign-up, and nothing you type is stored or sent anywhere.

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