GST Calculator
Add GST to a price or remove GST from it, with the CGST and SGST split.
Add GST • Remove GST • CGST/SGSTGST rates depend on the product or service. Check the current rate for your item on the official GST portal.
Whether you run a small shop, work as a freelancer or just want to check a bill, GST maths comes up all the time. Is the price with GST or without it? How much of it is CGST and how much SGST? Doing this by hand is easy to get wrong, especially when you need to remove GST from a final price.
This free GST calculator does both in one tap: add GST to a price, or remove GST from a price that already includes it. It also shows the CGST and SGST split.
How to use the GST calculator
- Enter the amount.
- Select the GST rate that applies.
- Tap Add GST if your amount is before tax, or Remove GST if your amount already includes GST.
- Read the GST amount, the final or original price, and the CGST/SGST split.
GST formulas
- Add GST: GST = Amount × Rate ÷ 100. Final price = Amount + GST.
- Remove GST: GST = Amount × Rate ÷ (100 + Rate). Original price = Amount − GST.
- Split: for a sale within the same state, CGST and SGST are half each. For a sale to another state, the whole amount is IGST.
Worked examples
Adding GST: a service costs ₹1,000 and GST is 18%. GST = ₹180, so the bill is ₹1,180 (CGST ₹90 + SGST ₹90).
Removing GST: a bill says ₹1,180 including 18% GST. GST = 1,180 × 18 ÷ 118 = ₹180, so the price before tax is ₹1,000. A common mistake is to take 18% of ₹1,180, which gives ₹212.40 and is wrong.
Useful tips
- Always check the current rate for your product or service on the official GST portal, because rates are revised by the GST Council.
- On invoices, show the taxable value and the tax separately.
- Keep your purchase bills; GST paid on business purchases can often be claimed as input tax credit.
Frequently asked questions
What is the difference between CGST, SGST and IGST?
CGST goes to the Centre and SGST to the state when you sell within one state. IGST is charged on sales from one state to another.
How do I find GST included in a price?
Use Remove GST. The formula is Amount × Rate ÷ (100 + Rate).
Can I use this for filing returns?
It is good for quick checks. For filing, use the figures from your accounting software and the GST portal.
Is it free?
Yes, completely free, with no sign-up.
