GST Calculator India: How to Calculate GST Amount Online
Calculate GST instantly for any amount and rate. Understand the difference between GST-exclusive and GST-inclusive calculations, CGST, SGST, and IGST.
What Is GST in India?
GST (Goods and Services Tax) is India's unified indirect tax that replaced VAT, service tax, excise duty, and other levies in July 2017. It's a destination-based, multi-stage tax applied at every point of sale.
GST has four main rate slabs: 5%, 12%, 18%, and 28%, plus a 0% rate for essential goods. The 18% rate applies to most services and manufactured goods.
CGST, SGST, and IGST — What's the Difference?
GST in India is divided into three components based on the type of transaction:
- CGST (Central GST) — collected by the Central Government on intra-state sales (within the same state). Typically half the applicable GST rate.
- SGST (State GST) — collected by the State Government on intra-state sales. Typically the other half of the applicable GST rate.
- IGST (Integrated GST) — collected by the Central Government on inter-state sales (between states). Equal to the full applicable GST rate.
For example, an 18% GST on an intra-state sale splits into 9% CGST + 9% SGST. On an inter-state sale, it's 18% IGST.
GST-Exclusive vs GST-Inclusive — Key Difference
This is where most people get confused:
- GST-Exclusive (Add-on): GST is added on top of the base price. Base price ₹10,000 + 18% GST = ₹11,800 total.
- GST-Inclusive (Reverse): The price already includes GST. Total price ₹11,800 — what is the base and GST amount?
Use our GST Calculator for add-on calculation, or our GST Inclusive Calculator to work backwards from a GST-inclusive price.
How to Use Our GST Calculator
- Enter the base amount (before GST)
- Select the GST rate (5%, 12%, 18%, or 28%)
- Click Calculate
You'll immediately see: the GST amount, total payable, and the CGST/SGST split for intra-state transactions.
GST Rate Chart — Common Goods and Services
- 0% — Fresh fruits, vegetables, milk, eggs, bread, books, newspapers
- 5% — Packaged food, coffee, tea, medicines, economy class air travel
- 12% — Butter, ghee, frozen meat, business class air travel, hotel rooms (₹1,000–₹7,500/night)
- 18% — Most services (banking, telecom, IT), restaurant meals, electronics
- 28% — Luxury goods, cigarettes, aerated drinks, premium cars, casinos