Free tool
GST Calculator
Add GST to a price or remove GST from an inclusive amount. See CGST + SGST (intra-state) and IGST (inter-state) instantly.
GST rate
Amount is
Base amount
Total GST
CGST + SGST (intra-state)
IGST (inter-state)
Total amount
How GST is calculated
Adding GST: GST = Amount × Rate ÷ 100; Total = Amount + GST. Example: ₹1,000 at 18% → GST ₹180, total ₹1,180.
Removing GST: Base = Amount ÷ (1 + Rate ÷ 100). Example: ₹1,180 inclusive at 18% → base ₹1,000, GST ₹180.
Within the same state GST is split equally into CGST and SGST; for inter-state supply the full amount is IGST.
Make GST invoices automatically
DhandhaBook picks CGST/SGST or IGST for you on every invoice.