GST Calculator
Add or remove GST and see the CGST/SGST split.
Your result appears here
Fill in the fields on the left and press Calculate. The answer, the breakdown and a copy button all land in this card.
How it is calculated
Adding GST: GST = amount × rate ÷ 100. Removing GST: GST = total − (total × 100 ÷ (100 + rate))
For an intra-state supply the GST splits equally into CGST and SGST. For inter-state supply the whole amount is IGST.
Worked example
₹10,000 plus 18% GST is ₹1,800 of tax and an invoice of ₹11,800, made of ₹900 CGST and ₹900 SGST. Working backwards from ₹11,800 returns the same ₹1,800.
Questions people ask
The price already contains the tax. To find the taxable value, divide the total by 1 plus the rate — for 18% that is dividing by 1.18.
IGST applies when the supplier and the place of supply are in different states, or for imports. Within one state the same total is split half as CGST and half as SGST.
Rates are set by HSN or SAC code and change from time to time. Check the current notified rate for your code before invoicing.