The GST Calculator works out the Goods and Services Tax on any amount. Enter a price, pick the GST rate, and it shows the GST amount, the net (pre-tax) price, and the gross (tax-inclusive) total, with the CGST and SGST split.
You can add GST to a base price or remove GST from a tax-inclusive price (reverse GST), which is handy for invoices, quotations, and checking bills.
How to calculate GST
- Enter the amount.
- Choose whether to add GST (amount is exclusive) or remove GST (amount already includes GST).
- Select the GST rate — 5%, 12%, 18%, or 28%.
- Read the GST amount, net price, gross price, and the CGST/SGST breakdown.
GST rates in India
Most goods and services fall under the 5%, 12%, 18%, or 28% slabs, with many essentials at 0%. For sales within a state, GST is split equally into CGST and SGST; for sales between states it becomes a single IGST.
What is reverse GST?
Reverse GST extracts the tax from a price that already includes GST. For example, if a bill of ₹1,180 includes 18% GST, the base price is ₹1,000 and the GST is ₹180. Choose “remove GST” to calculate this.
Frequently Asked Questions
How do I calculate GST on an amount?
Multiply the base amount by the GST rate. For 18% GST on ₹1,000, the GST is ₹180 and the total is ₹1,180. The calculator does this instantly and splits it into CGST and SGST.
How do I remove GST from a total price?
Divide the inclusive price by (1 + rate). For an 18% inclusive price of ₹1,180, the base is 1,180 ÷ 1.18 = ₹1,000 and the GST is ₹180. Select “remove GST” to do this automatically.
What are the GST rates in India?
The main slabs are 5%, 12%, 18%, and 28%, with 0% on many essentials. This calculator supports all the standard rates.
What is the difference between CGST, SGST, and IGST?
For sales within a state, GST is split equally into CGST (central) and SGST (state). For sales between states, the same total is charged as a single IGST.
Is this GST calculator free to use?
Yes, it is free, needs no sign-up, and runs entirely in your browser.