GST Calculator: How GST Works in India (2025 Guide)

What is GST?

GST (Goods and Services Tax) is India's unified indirect tax system introduced in July 2017. It replaced dozens of central and state taxes with a single tax framework. GST applies to the supply of goods and services across India.

GST Rate Slabs (2025)

• 0% — Essential items: fresh vegetables, milk, unprocessed food, books
• 5% — Basic necessities: packaged food, medicines, economy class air travel
• 12% — Standard goods: processed food, smartphones, computers
• 18% — Most services, electronics, cameras (most common rate)
• 28% — Luxury goods: cars, tobacco, air conditioners

CGST, SGST, and IGST

For intra-state transactions (seller and buyer in same state), GST splits equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) applies at the full rate.

Adding vs Removing GST

If you have the base price and want the GST-inclusive price: Total = Base × (1 + Rate/100). If you have the inclusive price and want the base: Base = Inclusive / (1 + Rate/100).

Use our GST Calculator to do this in one click.