GST Calculator

What Is a GST Calculator?

GST (Goods and Services Tax) is an indirect tax on the supply of goods and services in India. A GST calculator finds the GST amount and the final price for you. It helps shopkeepers, freelancers, business owners and anyone checking a bill.

Exclusive (add GST): The price does not include GST, so GST is added on top. Inclusive (remove GST): The price already includes GST, so the calculator works out the base price and the GST inside it.

How to Use the GST Calculator

1. Enter the amount in rupees, for example 10000.
2. Select the GST rate.
3. Choose Exclusive to add GST, or Inclusive to remove GST.
4. Click Calculate to see the GST amount, the CGST and SGST split, and the total.

CGST, SGST and IGST

When you sell within the same state, GST is split equally into Central GST (CGST) and State GST (SGST). At 18%, that is 9% CGST and 9% SGST. When you sell from one state to another, Integrated GST (IGST) applies at the full rate, for example 18% IGST. This calculator shows the CGST and SGST split.

Current GST Rate Slabs

Since 22 September 2025, the earlier 12% and 28% slabs no longer exist. A few items have special rates, for example precious metals. Always check the official GST rate notification for your product or service. Last checked on 30 September 2026.

GST Calculation Examples

Formulas: Exclusive GST = Amount × Rate ÷ 100. Inclusive GST = Amount − (Amount × 100 ÷ (100 + Rate)).

Why Use the WebToolsKit GST Calculator?

• Free and fast: No signup and no limit. Calculate GST in one click.
• Add or remove GST: Works for both exclusive and inclusive prices.
• Private by design: The calculation runs in your browser and your amounts are not sent to our server.

Frequently Asked Questions

1. What is a GST calculator?

It is a tool that calculates the GST amount, the base price and the final price. It works for both GST-exclusive and GST-inclusive prices.

2. How is GST calculated?

For an exclusive price, GST = Original Amount × GST Rate ÷ 100. For an inclusive price, GST = Original Amount − (Original Amount × 100 ÷ (100 + GST Rate)).

3. What are the current GST rates in India?

Since 22 September 2025, the main GST rates are 0%, 5%, 18% and 40%, plus a few special rates for some items. The earlier 12% and 28% slabs were removed. Check the official notification for the rate on your product or service.

4. What is the difference between inclusive and exclusive GST?

With exclusive GST, the tax is added on top of the base price. With inclusive GST, the price already contains the tax, so we extract it.

5. What is the difference between CGST, SGST and IGST?

For a sale within a state, GST is split into CGST and SGST. For a sale between states, IGST applies at the full rate.

6. Is my data private?

The calculation runs in your browser and your amounts are not sent to our server.

7. Can I use it for business invoices?

You can use it for quick checks. For official invoices and GST returns, use your billing or accounting software and consult your CA.