GST calculator
Add GST to a price or work back from a GST-inclusive price, at 5%, 18%, 40% or any other rate, with the CGST and SGST or IGST split.
Runs in your browser. Nothing you enter is uploaded.
Rates as of 14 November 2026, for tax year 2026-27 (1 April 2026 to 31 March 2027). Sources: Income Tax Department: tax slabs for individuals; Finance Bill 2026 memorandum: rates for tax year 2026-27; PIB: new regime slabs, rebate and standard deduction; PIB: recommendations of the 56th GST Council (rates from 22 September 2025); PIB: EPF wage ceiling raised to ₹25,000.
What it does
This calculator adds GST to a price, or takes a GST-inclusive price and separates the tax from the base price. It also shows the split into CGST and SGST for a sale within a state, or IGST for a sale between states.
How to use it
- Enter the amount.
- Say whether the amount is before GST or already includes it.
- Pick the GST rate that applies to the goods or service, or choose Other rate and type it.
- Read the base price, the GST and the total.
Worked example
Adding 18% GST to ₹1,000 gives GST of ₹180 and a total of ₹1,180. Going the other way, a price of ₹1,180 including 18% GST contains a base price of ₹1,000 and GST of ₹180. Within a state that ₹180 is ₹90 CGST and ₹90 SGST.
How it works
To add GST: GST = amount × rate ÷ 100. To remove GST from an inclusive price: base = amount ÷ (1 + rate ÷ 100), and GST is the difference. Taking the rate as a percentage of the inclusive price is a common mistake and gives the wrong answer.
Since 22 September 2025 the main GST rates are 5% and 18%, with 40% on a short list of goods such as tobacco products, aerated drinks and high-end cars. Some goods are exempt or taxed at nil, and special rates such as 3% on gold remain.
Questions
Which rate applies to my product?
The rate depends on the HSN or SAC code of the goods or service. Check the rate notifications on the CBIC GST website or ask your accountant. This calculator does not look up rates for you.
What are CGST, SGST and IGST?
For a sale within one state, the tax is split equally into central GST and state GST. For a sale from one state to another, the same total is charged as integrated GST.
What happened to the 12% and 28% rates?
They were removed from 22 September 2025. Choose Other rate if you need to check an old invoice.
Does it handle compensation cess?
No. Use Other rate with the combined percentage if you need an approximate total.