Online GST Calculator

Understanding GST Calculations

Goods and Services Tax (GST) is an indirect tax used in many countries, including India. It's crucial to know how to calculate it, whether you're a business owner or a consumer. Here are the simple formulas behind the two most common calculations.

How to Add GST (from a GST-exclusive price)

This is used when you have a base price (net amount) and you need to find the final price after adding GST.

GST Amount = (Original Cost × GST Rate) / 100

Final Price = Original Cost + GST Amount

Example: For an item costing ₹1,000 with 18% GST, the GST amount is (1000 * 18) / 100 = ₹180. The final price is 1000 + 180 = ₹1,180.

How to Remove GST (from a GST-inclusive price)

This is used when you have a final price that already includes GST, and you need to find the original base price and the GST component.

Base Price = Final Price / (1 + (GST Rate / 100))

GST Amount = Final Price - Base Price

Example: For an item costing ₹1,180 (inclusive of 18% GST), the base price is 1180 / (1 + (18 / 100)) = 1180 / 1.18 = ₹1,000. The GST amount is 1180 - 1000 = ₹180.

What are CGST, SGST, and IGST?

In India, GST is split into components: CGST (Central GST) and SGST (State GST) are levied on intra-state (within the same state) transactions. The GST rate is split equally between them (e.g., 18% GST = 9% CGST + 9% SGST). IGST (Integrated GST) is levied on inter-state (between different states) transactions. The rate is the full GST rate (e.g., 18% IGST).