Calculate GST instantly — add or remove Goods and Services Tax from any amount. Get the full CGST, SGST and IGST breakdown for intra-state and inter-state transactions.
Enter your figures and click Calculate to see your results.
Enter the amount, select a GST slab (5%, 12%, 18%, 28% or custom), choose Add or Remove GST, and select Intra-state or Inter-state supply to get the full CGST/SGST/IGST breakdown instantly.
Press the Calculate button. All results appear instantly — no page reload needed.
Your results are shown in a clear summary card. Use the Copy button to grab the result or Download to save a text report.
GST (Goods and Services Tax) is an indirect tax levied on the supply of goods and services in India. To add GST: GST Amount = (Base Amount × GST Rate) ÷ 100. Total = Base Amount + GST Amount. For example, on ₹10,000 at 18%: GST = ₹1,800, Total = ₹11,800.
For intra-state (within one state) transactions, GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) is charged at the full rate. So 18% intra-state = 9% CGST + 9% SGST. 18% inter-state = 18% IGST.
India has four main GST slabs: 5% (essential goods like edible oil, sugar, spices), 12% (processed food, computers), 18% (most goods and services, electronics, restaurants) and 28% (luxury and sin goods like cars, tobacco, aerated drinks). Some essentials are at 0% (exempt) and gold/silver at 3%.
Use the reverse GST formula: Base Amount = (Inclusive Price × 100) ÷ (100 + GST Rate). GST Amount = Inclusive Price − Base Amount. For example, if the total is ₹11,800 at 18% GST: Base = (11800 × 100) ÷ 118 = ₹10,000. GST = ₹1,800.
Any business or individual with an annual turnover exceeding ₹20 lakhs (₹10 lakhs for special category states) is required to register for GST and collect it on taxable supplies. Exporters, e-commerce sellers, and inter-state suppliers must also register regardless of turnover.
Yes — this calculator gives you the exact CGST, SGST and IGST amounts needed for GST-compliant invoices. Enter your base amount, choose the applicable slab, select the supply type and copy the results directly to your invoice.
Yes — completely free to use with no login, no sign-up and no usage limits.
Yes. All calculations happen entirely in your browser using JavaScript. No figures are ever sent to any server or stored.
