gst calculator: add or remove gst
to add 18% gst, multiply by 1.18: ₹5,000 becomes ₹5,900, with ₹900 gst (₹450 cgst + ₹450 sgst). to take gst out of an inclusive price, divide by 1.18: ₹1,180 is ₹1,000 plus ₹180 gst.
add gst or remove gst
| what you want | formula | at 18% |
|---|---|---|
| add gst to a price | price x (1 + rate/100) | ₹5,000 to ₹5,900 |
| gst inside an inclusive price | total x rate / (100 + rate) | ₹1,180 has ₹180 |
| price before gst | total x 100 / (100 + rate) | ₹1,180 is ₹1,000 |
cgst, sgst and igst
within one state the gst splits half and half into cgst and sgst: 18% is 9% cgst + 9% sgst. a sale to another state is charged as igst at the full rate.
gst 2.0 slabs
from 22 september 2025 the main gst slabs are 5% and 18%, with a 40% special rate for a short list of goods. nil/exempt items stay at 0%, and special rates of 3% and 0.25% continue. check the current rate for your exact item or service before you invoice.
calculate yours
arithmetic only, using the rate you pick. it does not decide which rate or place of supply applies to you, and leaves out cess.
use the gst calculator inside chatgpt
questions people ask
How do I add 18% GST to a price?
Multiply by 1.18. ₹5,000 plus 18% GST is ₹5,900: ₹900 GST, split as ₹450 CGST and ₹450 SGST within a state.
How do I remove GST from an inclusive price?
Divide by (1 + rate/100). ₹1,180 including 18% GST is ₹1,000 before tax plus ₹180 GST.
What are the GST slabs after GST 2.0?
From 22 September 2025 the main slabs are 5% and 18%, with a 40% special rate for a few goods, 0% for nil/exempt items and special rates of 3% and 0.25%. Verify the current rate for your specific item.
When is IGST charged instead of CGST and SGST?
IGST applies to interstate supplies. Within one state the same rate is split equally into CGST and SGST.