GST Calculator

Understanding GST on a price

The Goods and Services Tax (GST) is India's unified indirect tax on the supply of goods and services. When you see a price, GST is either added on top of a base amount (exclusive pricing) or already baked in (inclusive pricing). This calculator handles both directions — adding tax to a net price, or extracting the tax hidden inside a final price.

• Add GST (exclusive): GST = Amount × rate/100, and the total is Base + GST.
• Remove GST (inclusive): Base = Amount ÷ (1 + rate/100), and the difference is the embedded GST.

CGST, SGST and IGST

How the tax is labelled depends on where the buyer and seller are:

• For an intra-state sale (same state), the rate splits equally into CGST (Central GST) and SGST (State GST). An 18% rate becomes 9% CGST + 9% SGST.
• For an inter-state sale or an import, a single IGST is charged at the full rate and later apportioned to the destination state.

This tool shows the CGST/SGST split used on most local invoices.

The GST slabs

India applies four principal rates — 5%, 12%, 18% and 28%. Essentials and unbranded staples sit at nil or 5%, the bulk of goods and services fall at 18%, and luxury or sin goods attract 28%, sometimes with an additional compensation cess. Choosing the correct slab depends on the item's HSN (for goods) or SAC (for services) code.

Input tax credit and why GST is not double taxation

A key feature of GST is input tax credit (ITC). A registered business offsets the tax it pays on purchases against the tax it collects on sales, so tax applies only to the value it adds at each stage. This prevents the cascading "tax on tax" of the older system. While this calculator focuses on splitting a single price, businesses should track ITC separately to arrive at the net GST actually payable to the government.