🧾 GST Calculator
A simple, instant tool for businesses and consumers to add or remove Good and Services Tax from any given amount.
Invoice Details
Enter Base Amount
Select GST Slab
Or enter custom GST rate (%)
Total Final Price (with GST)
₹11,800
Net Base Amount
₹10,000
Total GST Applied
CGST (9%): ₹900 | SGST (9%): ₹900
+₹1,800
Gross Final Amount
₹11,800
18%
GST Rate
How GST Calculation Works
Adding GST (Exclusive)
This is used when a product’s price does not include GST. You must add the GST percentage to find the final selling price.
Formula: Final Price = Base Amount + (Base Amount × GST%)
Removing GST (Inclusive)
This is used when you have the final invoice amount that already includes GST, and you need to reverse-engineer it to find the original Base Price and the Tax amount separately.
Formula: Base Amount = Final Price / (1 + GST%)
What are CGST and SGST?
The total GST is usually divided equally into two parts for intra-state sales:
- CGST (Central GST): Goes to the Central Government (50% of total GST).
- SGST (State GST): Goes to the State Government (50% of total GST).
- Note: For inter-state sales, IGST (Integrated GST) is charged as the full 100% rate.