GST Calculator
Calculate GST with CGST, SGST and IGST breakup, for GST-exclusive or GST-inclusive amounts.
What is the GST Calculator?
The GST Calculator is a free online calculator that calculates GST with CGST, SGST and IGST breakup for any amount. Enter your amount, pick a GST rate, and it instantly shows the base amount, the GST amount, the split, and the total, with no sign-up, no app, and everything working right in your browser. It also shows a colourful chart of the breakup, so you can see at a glance how much is the base amount and how much is tax.
You can switch between GST-exclusive and GST-inclusive amounts, and between intra-state (CGST plus SGST) and inter-state (IGST) transactions, which makes it easy to check bills, quotes, and invoices before you finalise them.
Key Features
- Instant results, with the full breakup shown on page load
- CGST plus SGST split for intra-state, and IGST for inter-state transactions
- GST-exclusive and GST-inclusive calculations in one tool
- A colourful donut chart showing base amount versus GST
- Standard GST rates (5%, 12%, 18%, 28%) plus a custom rate option
- Free, no sign-up, works on mobile and desktop
How to Use the GST Calculator
- Enter the amount in rupees.
- Pick a GST rate, or choose Custom rate and enter your own.
- Choose Exclusive if GST is to be added, or Inclusive if GST is already included in the amount.
- Choose Intra-state for CGST plus SGST, or Inter-state for IGST.
- Read the breakup and the chart, and adjust any value to compare scenarios.
How to Read the Result
Start with the base amount and the GST amount, then look at the split: for intra-state transactions the GST is divided equally into CGST and SGST, while for inter-state transactions the full GST appears as IGST. The total is the amount you actually pay or charge.
Frequently Asked Questions
Is this GST calculator free?
Yes. It is completely free, with no sign-up and no hidden charges.
How is CGST and SGST split?
For intra-state transactions, the total GST is split equally: half CGST and half SGST. For inter-state transactions, the full GST is charged as IGST.
What is the difference between exclusive and inclusive?
Exclusive means GST is added on top of the amount. Inclusive means GST is already included in the amount, so the tool first finds the base amount and then the GST part inside it.
How do CGST, SGST, and IGST differ?
A GST Calculator splits tax by where the sale happens. For sales within one state, it shows CGST plus SGST, each half of the total rate, going to the central and state governments. For sales between states, it shows IGST, the full rate collected as one integrated tax. The tool handles both directions: enter an exclusive amount to add tax, or an inclusive amount to work backwards to the base price. With the example of 10,000 rupees at 18 percent exclusive, the GST Calculator shows GST of 1,800 rupees, split as CGST 900 rupees and SGST 900 rupees, for a total of 11,800 rupees.
Rates matter as much as the split: this calculator supports 5, 12, 18, and 28 percent plus a custom rate, because different goods and services fall in different slabs. The GST Calculator donut chart shows the base versus the tax, which helps when quoting a customer who asks why the bill exceeds the catalogue price. For the official portal, rates, and returns, see gst.gov.in, the official GST portal.
What is the reverse charge case?
Reverse charge, where the buyer pays the tax instead of the seller, applies to specific notified supplies and is not what this tool models. The GST Calculator here covers the standard forward-charge case used in ordinary bills and invoices.
