GST Calculator
Add GST to a price or remove it from a total, and see the split into CGST and SGST, or IGST. Choose 5%, 18%, 40% or any other rate. It runs in your browser.
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Updated November 9, 2026
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How to use it
- 1
Enter the amount
Type a price before GST, or a total that includes it.
- 2
Choose the GST rate
Pick a common rate, or choose Other rate and type your own.
- 3
Pick within a state or between states
The tool splits the tax into CGST and SGST, or shows it as IGST.
Questions about gst calculator
What are CGST, SGST and IGST?
For a sale within one state, GST is split equally between the central and state governments as CGST and SGST. For a sale between states, it is charged as IGST.
Which GST rate applies?
It depends on the item or service. India restructured its GST rates in September 2025, so check the rate for what you sell, or use Other rate for any special rate.
How is GST taken out of a total?
The total is divided by one plus the rate. For 18%, divide by 1.18.
Adding and removing GST
To add GST, multiply the price by the rate. At 18%, a price of 1,000 carries 180 of GST and costs 1,180. To remove GST from a total, divide by 1.18 instead of taking 18% off. Dividing 1,180 by 1.18 gives back 1,000, while 18% of 1,180 is 212.40, which is too much.
| Rate | GST on 1,000 | Total price |
|---|---|---|
| 5% | 50.00 | 1,050.00 |
| 18% | 180.00 | 1,180.00 |
| 40% | 400.00 | 1,400.00 |
CGST, SGST and IGST
For a sale within one state, the GST is split equally between the central and state governments. At 18% on 1,000, that is 90.00 of CGST and 90.00 of SGST. For a sale between states, the whole 180.00 is charged as IGST. The total is the same either way, so the choice only changes how the tax is shown on an invoice.
India’s main GST rates are now 5%, 18% and 40%, after a restructuring in September 2025, with a few special rates such as 3% on gold. The rate depends on the item or service, so check it for what you sell, and use Other rate to type any rate that is not listed.
On an invoice
A GST invoice shows the price before tax, the rate, and the tax split into CGST and SGST or shown as IGST. Use Remove GST when a customer gives you a final price that already includes the tax and you need the taxable value and the tax for your records.
A GST-registered business can usually claim credit for the GST it pays on purchases, so the tax you collect is not all kept by you. The tool shows two decimals and does not round line by line, so check your invoice software if it rounds differently.