Mathematical Formula & Method
GST Calculator India Formula
Add GST: GST Amount = (Amount × Rate) / 100 | Remove GST: Net = (Amount × 100) / (100 + Rate)
The GST Calculator India computes Goods and Services Tax according to current Indian tax regulations. It supports adding GST to a net amount or removing GST from a gross price, with an automatic breakdown into equal Central GST (CGST) and State GST (SGST) or Integrated GST (IGST).
Worked Examples & Step-by-Step Solutions
Adding 18% GST to ₹10,000 service
- Net Amount: ₹10,000.
- Total GST (18%): ₹10,000 × 0.18 = ₹1,800.
- CGST (9%): ₹900 | SGST (9%): ₹900.
- Total Invoice Value: ₹10,000 + ₹1,800 = ₹11,800.
Removing 18% GST from ₹11,800 inclusive bill
- Formula: Net = (11,800 × 100) / (100 + 18) = 1,180,000 / 118 = ₹10,000.
- GST extracted: ₹11,800 − ₹10,000 = ₹1,800.
How to Use the GST Calculator India
- Enter your transaction amount in Indian Rupees (₹).
- Choose the applicable GST slab (3%, 5%, 12%, 18%, or 28%).
- Select whether you want to Add GST or Remove GST from an MRP.
- View the complete tax invoice breakdown.
Important Assumptions & Unit Conventions
- Does not calculate compensation cess where applicable (such as tobacco or automobiles).
- Intra-state transactions split GST into CGST + SGST (50/50); inter-state transactions use IGST.
Frequently Asked Questions
What is the formula to remove GST from a total price?
Net Price = (Gross Amount × 100) / (100 + GST Rate). GST Amount = Gross Amount − Net Price.
How are CGST and SGST divided?
In intra-state sales, total GST is divided equally: half goes to the Central Government (CGST) and half to the State Government (SGST).
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