Calculator
GST Calculator
Calculate GST for any Indian tax slab — get base amount, GST, total, and CGST/SGST/IGST breakdown.
About this calculator
India's Goods and Services Tax (GST) applies at four main rates — 5%, 12%, 18%, and 28% — plus a custom rate option for special categories. CalcKit's GST calculator works in two directions: Add GST mode takes a pre-tax (exclusive) amount and computes the GST and final payable total, while Remove GST mode works backwards from a GST-inclusive price to extract the base amount and the tax component. Every result includes a full breakdown showing CGST and SGST (each at half the applicable rate, for intra-state transactions) as well as the equivalent IGST amount (the full rate, for inter-state transactions). Whether you are a freelancer raising an invoice, a business owner verifying a vendor bill, or a student studying indirect taxation, this calculator gives you the exact figures in seconds.