GST Calculator
Enter an amount and a GST rate to get the price before tax, the GST, the CGST and SGST (or IGST) and the total. Switch between adding GST and removing it from a price that already includes it.
Runs in your browser. Your files never leave your device.
How it works
- 01Enter the amount and pick the GST rate.
- 02Choose whether to add or remove GST.
- 03Read the tax split and total.
Tips and common mistakes
Adding GST and removing GST are different
To add GST, multiply the price by the rate. To take GST out of a price that already includes it, divide by 1 plus the rate. For example, Rs 1,180 including 18% GST is Rs 1,000 plus Rs 180 of GST. Do not simply subtract 18% from 1,180, because that gives the wrong answer.
CGST, SGST and IGST
For a sale inside one state, the GST is split equally into CGST and SGST (for 18%, that is 9% each). For a sale between states, the whole amount is charged as IGST. The total tax is the same either way.
Guides for this tool
Questions
Which GST rates are there?
The common slabs are 3%, 5%, 12%, 18% and 28%. You can also type any rate.
When do I use IGST?
IGST applies to sales between states. Within a state the tax is split equally into CGST and SGST.
Is my file uploaded to a server?
No. Everything happens inside your browser on your own device. Your files are never sent to us or anyone else.
Is it free?
Yes. It is free to use, with no signup, no watermark and no daily limit.