Preparing tool
How to use GST Calculator
- Choose Add GST if your price excludes GST, or Remove GST if it already includes GST. Enter the amount and, if you like, the quantity.
- Pick the GST rate (5%, 18%, 40%, 3%, 0.25% or 0%, or a custom rate such as 12% or 28%) and whether the supply is within your state (CGST + SGST) or to another state (IGST). Add compensation cess if it applies.
- Read the total and the line-by-line split, and copy the breakdown for your invoice or accounts.
What are the limits of GST Calculator?
Rates follow the GST 2.0 slabs that took effect on 22 September 2025; the correct rate depends on the HSN or SAC code of your goods or services, so confirm it before invoicing. Each tax is rounded to the paisa, and when removing GST the parts are adjusted by at most a paisa so they add back to the amount you entered. This is a calculator, not tax advice. Everything runs in your browser.