GST Calculator

What Is the GST Calculator?

It adds Goods and Services Tax to a price, or takes it out of a price that already includes GST, and shows how the tax splits between the central and state governments. It uses the rates that apply since GST 2.0 took effect on 22 September 2025, and lets you enter any other rate.

How to Use It

1. Choose Add GST for a price before tax, or Remove GST for a price that already includes it.
2. Enter the price and choose the GST rate.
3. Choose whether the sale is within your state (CGST + SGST) or to another state (IGST).

Example

A bill of ₹11,800 including 18% GST breaks down into a price of ₹10,000 and GST of ₹1,800. For a sale within the same state, that is ₹900 CGST and ₹900 SGST; for a sale to another state, the whole ₹1,800 is IGST.

The Formulas

• Adding GST: GST = price × rate ÷ 100, and total = price + GST.
• Removing GST: price = total ÷ (1 + rate ÷ 100). Do not just take 18% off the total - that gives the wrong answer.

Current GST Rates

Since 22 September 2025, most goods and services fall into three main rates: 5% for many essentials, 18% as the standard rate, and 40% for luxury and sin goods such as pan masala and large cars. Many essentials are at 0%, and special rates such as 3% for gold remain. The old 12% and 28% slabs were largely removed, but you may still see them on older invoices.

Limitations

The right rate depends on the exact HSN or SAC code of what you sell, and some items carry a cess on top. Input tax credit, reverse charge and composition-scheme rules are not covered. For percentages in general, use the Percentage Calculator; to write an invoice amount in words, use the Number to Words Converter.