GST Calculator

What is GST?

GST (Goods and Services Tax) is a single, unified indirect tax levied on the supply of goods and services across India. It replaced multiple older taxes like VAT, Service Tax, and Excise Duty. GST is charged at different rates — 0%, 5%, 12%, 18%, and 28% — depending on the category of goods or services.

How to Calculate GST

To add GST to a base amount, multiply the amount by the GST rate and divide by 100, then add it to the original amount. For example, on ₹1,000 at 18% GST, the GST amount is ₹180, making the total ₹1,180. To remove GST from a total (reverse calculation), divide the total by (100 + GST rate) and multiply by 100 to get the base price.

CGST, SGST, and IGST Explained

For transactions within the same state (intra-state), GST is split equally into CGST (Central GST) and SGST (State GST) — for example, 18% GST becomes 9% CGST + 9% SGST. For transactions between different states (inter-state), the full GST amount is charged as IGST (Integrated GST), which goes to the central government and is later distributed.

Frequently Asked Questions

What are the current GST rates in India?

India has five main GST slabs: 0% (essential items), 5% (essential goods), 12% (standard goods), 18% (most goods and services), and 28% (luxury and sin goods).

How do I calculate GST backwards from the total amount?

To find the base price from a GST-inclusive amount, divide the total by (1 + GST rate/100). For example, ₹1,180 at 18% GST gives a base price of ₹1,000.

Is this GST calculator free to use?

Yes, the GST Calculator on Tools4India is completely free with no signup or login required, and works on both desktop and mobile.