GST Calculator
About the GST Calculator
Goods and Services Tax (GST) is the indirect tax added to most goods and services in India. This calculator works both ways: add GST to a base (exclusive) amount to get the final price, or remove GST from a GST-inclusive price to find the base value and the tax inside it.
Pick the GST rate that applies to your item and the calculator splits out the GST amount and the net or gross figure.
Frequently asked questions
How do I add GST to an amount?
Multiply the base amount by the GST rate: GST = amount × rate ÷ 100, and the final price = amount + GST. For example, ₹1,000 at 18% adds ₹180, for ₹1,180.
How do I remove GST from an inclusive price?
Work backwards: base = inclusive amount × 100 ÷ (100 + rate). For ₹1,180 at 18%, the base is ₹1,000 and the GST inside it is ₹180.
What are the GST rate slabs in India?
Since 22 September 2025 the main GST rates are 0%, 5%, 18% and 40%. The old 12% and 28% slabs were removed — most of what they held moved to 5% and 18% — and 40% applies to a short list such as tobacco, pan masala, aerated drinks and larger cars. Gold, silver and jewellery keep a separate 3% rate. Most services are at 18%. Check the notified rate for your specific item, as classifications can change.
What is the difference between CGST, SGST and IGST?
For a sale within a state, GST is split equally into CGST (central) and SGST (state) — so 18% is 9% + 9%. For a sale between states the same total is charged as a single IGST. The total tax is the same either way.
Is GST calculated on the discounted price?
Yes. GST applies to the price after any discount shown on the invoice, not the original marked price.
Disclaimer: This calculator is for information and education only. It is not investment advice and not a recommendation, and it is not tax or legal advice. It applies the tax rules the calculator describes, in simplified form; the rules change with each Budget and notification, and the actual liability depends on your full facts, the deductions you are entitled to and the law in force. Every figure is computed solely by applying the formula and assumptions stated on this page to the inputs you entered.