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GST Calculator

Calculate GST with inclusive/exclusive modes and CGST/SGST split. Use when the applicable Indian GST rate is already known.

About GST Calculator

Calculate GST arithmetic with inclusive/exclusive modes, CGST/SGST split, and invoice-style preview when the applicable rate is known.

The GST Calculator applies the GST rate you choose to an entered amount for India-style GST math. It supports both inclusive mode, which extracts GST from a total, and exclusive mode, which adds GST to a base price. The output is a calculation aid, not tax advice or a determination of the legally applicable rate.

How to use GST Calculator

Enter the amount and select the GST rate shown in the tool. Choose inclusive or exclusive mode. The calculator shows the base amount, GST amount, CGST/SGST split, and total. Confirm the legally applicable rate, place of supply, exemptions, and invoicing treatment with current official guidance or a tax professional before using figures for compliance.

GST Calculator example

A product priced at Rs.1,000 with 18% GST exclusive: GST = Rs.180 (CGST Rs.90 + SGST Rs.90), Total = Rs.1,180. In inclusive mode: Base = Rs.847.46, GST = Rs.152.54, still totaling Rs.1,000.

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Helpful questions

What are the GST rates in India?

GST rates depend on the goods or services, exemptions, notifications, and current law. Use the rates in this calculator only after confirming that the selected slab applies to your transaction.

What's the difference between CGST and SGST?

In general, intra-state supplies are split between CGST and SGST, while inter-state supplies use IGST. Confirm the place-of-supply treatment for your transaction before relying on the split for compliance.

How do I calculate GST exclusive?

Multiply the base amount by the GST rate and add it to the base: Base multiplied by (1 + GST%). For Rs.1,000 at 18%: Rs.1,000 multiplied by 1.18 = Rs.1,180 total.

How do I calculate GST inclusive?

Divide the total by (1 + GST rate) to get the base amount: Rs.1,180 divided by 1.18 = Rs.1,000 base. The difference (Rs.180) is the GST amount.