GST calculator for India
Add GST to a price, or work out the GST inside an inclusive price, with the CGST and SGST split or IGST. Works in English and Tamil. Nothing you type leaves your browser.
How do I add GST to a price?
Multiply the price by the GST rate and divide by 100 to get the GST amount, then add it to the price. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180.
How do I remove GST from an inclusive price?
Divide the inclusive price by (1 + rate ÷ 100) to get the taxable value; the rest is GST. For ₹1,180 at 18%, the taxable value is ₹1,000 and GST is ₹180.
When do I charge CGST and SGST instead of IGST?
For a sale within your own state, GST is split equally into CGST and SGST. For a supply to another state, the full rate is charged as IGST.
Which GST rates apply?
From 22 September 2025 most goods and services fall under 5% or 18%, with 40% for specified luxury and sin goods and special rates such as 3% for gold. Check the rate for your item with your CA.
This calculator is for quick estimates. Confirm rates and tax treatment for your business with your CA. See also the GST bill format.