GST Calculator
This calculator applies the standard formulas and does not replace professional tax advice. Check rates and rules that apply to your goods or services.
How to use this tool
- Enter the amount and choose whether it includes GST or not.
- Select a GST rate, or enter a custom rate.
- Choose same-state (CGST + SGST) or different-state (IGST) and press Calculate.
Examples
- GST-exclusive
- 1,000 at 18% gives GST 180 and a total of 1,180.
- GST-inclusive
- 1,180 at 18% gives a taxable value of 1,000 and GST 180.
Frequently asked questions
What is the difference between CGST/SGST and IGST?
For a supply within one state the GST is split equally into CGST and SGST. For a supply between states the full amount is charged as IGST.
Are the results rounded?
Amounts are rounded to two decimals. Invoices may round differently, so check against your accounting rules.