GST Calculator
Add GST to a price, or work out the GST already included in it.
Inputs
Same state uses CGST + SGST; different states use IGST.
Result
CGST + SGST at 18%
- Amount (excl. GST)
- ₹1,000.00
- CGST @ 9%
- ₹90.00
- SGST / UTGST @ 9%
- ₹90.00
- Total GST
- ₹180.00
- Total amount
- ₹1,180.00
How GST is calculated
Adding GST: GST amount = original price × GST rate ÷ 100, and the final price is the original price plus GST.
Removing GST: taxable value = GST-inclusive price ÷ (1 + GST rate ÷ 100), and GST is the difference between the two.
Within the same state the GST is shared equally between CGST and SGST; between states it is charged entirely as IGST.
Example at 18%
| Case | Taxable value | CGST 9% | SGST 9% | IGST 18% | Total |
|---|---|---|---|---|---|
| Same state | ₹1,000 | ₹90 | ₹90 | – | ₹1,180 |
| Other state | ₹1,000 | – | – | ₹180 | ₹1,180 |
Turn the numbers into a GST invoice
InstaInvoice calculates CGST, SGST and IGST on every invoice automatically, from the customer's state. Billing and PDF downloads are free.
Create a free GST invoiceFrequently asked questions
How do I add GST to a price?
Multiply the price by the GST rate and add it: GST = price × rate ÷ 100, total = price + GST. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180.
How do I remove GST from an inclusive price?
Divide the inclusive amount by (1 + rate ÷ 100) to get the taxable value; the rest is GST. For ₹1,180 at 18%: 1,180 ÷ 1.18 = ₹1,000 taxable value and ₹180 GST.
When is GST split into CGST and SGST?
When the supplier and the place of supply are in the same state, GST is split equally into CGST and SGST (or UTGST in a union territory). For a supply to another state, the whole amount is IGST.
What are the GST rates in India?
Most goods and services are taxed at 5% or 18%, a small group of luxury and sin goods at 40%, and some items at special rates such as 0.25% and 3%. Rates of 12% and 28% appear on older invoices. Always confirm the rate for your item by its HSN or SAC code.
Is this GST calculator free?
Yes. It is free with no sign-up. InstaInvoice can also put these figures straight into a GST invoice.