GST Calculator India — Calculate Tax Amount & Total Price

Last updated: 29 April 2026 Reviewed by Arjun Mehta, CA

**GST (Goods and Services Tax)** is India's unified indirect tax that replaced VAT, service tax, and excise duty. The current GST rates are 0%, 5%, 12%, 18%, and 28% depending on the category of goods or services. This calculator helps you compute the GST amount on any transaction and find the price before tax from an inclusive price.

Base Amount (₹) Amount before GST

GST Rate

GST Amount —

Total Amount (with GST) —

CGST (Central) —

SGST/UTGST (State) —

View Year-by-Year Breakdown

Real-World Examples — 2026

Restaurant bill calculation (18% GST)

A restaurant bill of ₹2,000 attracts 18% GST = ₹360 (CGST ₹180 + SGST ₹180). Total payable: ₹2,360. AC restaurants charge 18%; non-AC restaurants up to ₹7,500 turnover threshold charge 5% GST.

Construction service (18% GST)

Construction service costing ₹10 lakh attracts 18% GST = ₹1.8 lakh. Total invoice: ₹11.8 lakh. Note: affordable housing (under ₹45 lakh) attracts concessional 1% GST under specified schemes.

Frequently Asked Questions

What are the GST slab rates in India 2026?

GST has 4 main slabs: 5% (essential goods, basic food items, transport), 12% (processed food, mobiles, medicines), 18% (most services, electronics, restaurants), 28% (luxury goods, cars, tobacco). Basic food items like fresh vegetables, unprocessed grains, and milk are exempt (0%).

What is the difference between CGST and SGST?

GST is a dual tax: CGST (Central GST) collected by the Centre and SGST (State GST) collected by the state. Each is half the total GST rate. For 18% GST, CGST = 9% and SGST = 9%. For interstate transactions, IGST (Integrated GST) applies instead.

Do I need to register for GST?

GST registration is mandatory for businesses with annual turnover above ₹40 lakh (₹20 lakh for special category states). Service providers must register above ₹20 lakh turnover. E-commerce sellers must register regardless of turnover.

Is the GST Calculator free?

Yes, the GST Calculator on CalcPhi is completely free with no registration required.

Are my inputs stored?

No. All calculations run in your browser. We do not store any financial data.

Can I use the GST Calculator on mobile?

Yes. CalcPhi is fully mobile-optimised and works on all modern smartphones.