Add or remove GST with CGST/SGST split for all Indian GST rates.. GST Calculator is a free online tool from the ToolsRift Finance & Health Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter the amount, choose a GST rate and select add or remove GST. The calculator shows the net price, GST amount with CGST/SGST split and gross total.
GST amount = price × rate%. The gross = price + GST. For ₹1,000 at 18% GST, tax is ₹180 and the total payable is ₹1,180.
Net price = gross / (1 + rate%). For ₹1,180 including 18% GST, the base price is ₹1,180 / 1.18 = ₹1,000 and the GST portion is ₹180.
For intra-state sales, GST splits equally into Central GST and State GST. An 18% rate becomes 9% CGST plus 9% SGST, which this tool shows automatically.