How to Use the GST Calculator (India – CGST, SGST, IGST)

This calculator helps you quickly calculate GST for any amount under the Indian Goods and Services Tax India system, including CGST, SGST, and IGST.

• 1. Enter Amount (₹)
  Enter the price of the product/service.
• 2. Select GST Rate (%)
  Choose applicable GST rate:
  • 5%
  • 12%
  • 18%
  • 28%
• 3. Select Tax Type
  • CGST + SGST (Intra-State) → when buyer & seller are in same state
  • IGST (Inter-State) → when buyer & seller are in different states
• 4. Select Calculation Type
  • Add GST (Exclusive) → GST is added on base price
  • Remove GST (Inclusive) → GST is already included in price
• 5. Click “Calculate GST”

What Results You Get

After calculation, the tool shows:

• ✔ Base Amount (original price)
• ✔ Total GST Amount
• ✔ CGST (half of GST)
• ✔ SGST (half of GST)
• ✔ IGST (if applicable)
• ✔ Final Total Amount

GST Calculation Formula

1. GST Exclusive (Add GST)

If price does NOT include GST:

[
GST = \frac{Amount \times Rate}{100}
]

[
Total = Amount + GST
]

Example:

• Amount = ₹1000
• GST = 18%

GST = 1000 × 18 / 100 = ₹180
Total = ₹1180

2. GST Inclusive (Remove GST)

If price already includes GST:

[
Base = \frac{Amount}{1 + \frac{Rate}{100}}
]

[
GST = Amount - Base
]

Example:

• Total = ₹1180
• GST = 18%

Base = 1180 / 1.18 = ₹1000
GST = ₹180

3. CGST & SGST Calculation

For intra-state:

[
CGST = \frac{GST}{2}, \quad SGST = \frac{GST}{2}
]

Example: GST ₹180

• CGST = ₹90
• SGST = ₹90

4. IGST Calculation

For inter-state:

[
IGST = GST
]

• Amount = ₹1000
• GST Rate = 18%
• Type = Exclusive
• Tax Type = CGST + SGST

Result:

• GST = ₹180
• CGST = ₹90
• SGST = ₹90
• Total = ₹1180

Why This Tool is Useful

• ✔ Instant GST calculation
• ✔ Useful for billing & invoicing
• ✔ Works for both inclusive & exclusive prices
• ✔ Helps business owners & freelancers
• ✔ Avoid manual calculation errors

Important Note

• This tool provides accurate mathematical results
• Actual GST applicability depends on:
  • Product/service category
  • Government GST rules