About the GST calculator
A GST (Goods & Services Tax) calculator works out the tax on a product or service in seconds. Use Add GST to add tax to a base price, or Remove GST to extract the tax already included in a final price. It also splits the total into CGST and SGST automatically.
How GST is calculated
- Add (exclusive):
GST = amount × rate / 100, total = amount + GST. - Remove (inclusive):
base = amount / (1 + rate / 100), GST = amount − base.
CGST and SGST split
For supplies within the same state, GST is divided equally between Central GST (CGST) and State GST (SGST). An 18% rate therefore becomes 9% CGST + 9% SGST. For inter-state supplies, the combined amount is charged as IGST instead.
Common GST slabs in India
Most goods and services fall under 5%, 12%, 18% or 28%, with a special 3% rate for items like gold. Pick a preset above or enter a custom rate to match your invoice.