GST Calculator
Calculate Goods and Services Tax (GST) instantly with our free online calculator. Support for both forward calculation (add GST to base price) and reverse calculation (extract GST from inclusive price).
GST Rate Quick Reference
Key Features
How to Use This Calculator
Understanding GST Calculation
The GST Calculator helps businesses and individuals calculate Goods and Services Tax quickly and accurately. GST is an indirect tax levied on the supply of goods and services in India, replacing multiple earlier taxes.
Forward GST calculation adds tax to the base price: GST Amount = Base Price × GST Rate. If a product costs ₹1,000 and GST is 18%, the GST amount is ₹180, making the total ₹1,180.
Reverse GST calculation extracts tax from an inclusive price: Base Price = Inclusive Price / (1 + GST Rate). If the inclusive price is ₹1,180 at 18% GST, the base price is ₹1,000 and GST is ₹180.
For intrastate transactions (within the same state), GST is split equally between CGST (Central GST) and SGST (State GST). For interstate transactions, the entire amount is collected as IGST (Integrated GST).
Understanding GST calculations is essential for proper invoicing, filing returns, and claiming input tax credit. Our calculator provides accurate breakdowns for all common GST rates: 5%, 12%, 18%, and 28%.