GST calculator · Free
GST calculator: add or remove GST in one step
Type an amount, pick the rate and see the tax, the total and how it splits into CGST and SGST or IGST. Nothing leaves your browser.
GST calculator
Runs in your browser. Nothing you type is sent or saved.
The rule in short
To add GST, GST = price × rate ÷ 100. To find the GST inside a price that already includes it, GST = price × rate ÷ (100 + rate). A sale within your state splits the tax equally into CGST and SGST (or UTGST); a sale to another state is charged as IGST. Since 22 September 2025 the main rates are 5% and 18%, with 40% for a short list of luxury and sin goods.
The formulas
- Adding GST: GST = amount × rate ÷ 100, total = amount + GST
- Removing GST: GST = amount × rate ÷ (100 + rate), price before tax = amount − GST
- Within a state: CGST = SGST = GST ÷ 2
- Between states: IGST = the full GST
GST rates after 22 September 2025
On the 56th GST Council's recommendation, the 12% and 28% slabs were merged into 5% and 18%, and a 40% rate was added for luxury and sin goods (CGST rate notification 9/2025-Central Tax (Rate), dated 17 September 2025). Gold, silver and jewellery stay at 3% and rough precious stones at 0.25%. Check your item's HSN or SAC code for its exact rate; a few items, such as some tobacco products, moved on later dates.
The legal basis
CGST and SGST are levied under Section 9 of the CGST Act, 2017 and each state's SGST Act; IGST on inter-state supplies under Section 5 of the IGST Act, 2017. Whether a sale is within the state or between states depends on the place of supply (IGST Act, Sections 10 and 12). GST is charged on the transaction value under Section 15 of the CGST Act.
How to use it
Enter the amount
Type the price in rupees.
Pick the rate and the direction
Choose the GST rate, then "Add GST" for a price before tax or "Remove GST" for a price that already includes it.
Choose where you sell
Within your state for CGST + SGST, or another state for IGST. The tax, the split and the total update as you type.
Frequently asked questions
How do I calculate GST on a price?
Multiply the price by the rate and divide by 100. At 18%, GST on ₹1,000 is ₹180 and the total is ₹1,180.
How do I remove GST from an inclusive price?
GST = price × rate ÷ (100 + rate). At 18%, a price of ₹1,180 holds ₹180 of GST, so the price before tax is ₹1,000.
When do I charge CGST and SGST, and when IGST?
When the supplier and the place of supply are in the same state, charge CGST and SGST in equal halves. When they are in different states, charge IGST at the full rate.
What are the GST rates now?
Since 22 September 2025 most goods and services are at 5% or 18%, with 40% for luxury and sin goods, 3% for gold and jewellery, 0.25% for rough precious stones and 0% for exempt items. Your HSN or SAC code decides the rate.
Is this tax advice?
No. The calculator does the arithmetic. Check the rate for your item with your CA.
Sources
- CBIC: GST rates for goods and services
- CGST Act, 2017 (Sections 9 and 15)
- IGST Act, 2017 (Sections 5, 10 and 12)
This page explains the rules in general terms as of November 2026. It is not tax or legal advice; check your case with your CA.
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