About GST Calculator India
The ManTech GST Calculator is a free online tool designed for business owners, accountants, freelancers, and taxpayers across India to determine tax obligations accurately.
Under the Goods and Services Tax (GST) system introduced in 2017, transactions are categorized into intra-state (within the same state) and inter-state (between different states). For intra-state transactions, tax is divided equally into Central GST (CGST) and State GST (SGST). For inter-state transactions, Integrated GST (IGST) is applied.
Whether you need to add GST to a net price or remove GST from a total bill to find the original taxable value, this calculator delivers instant results without requiring any login or software installation.
GST Calculation Formulas
GST Amount = Base Amount × (GST Rate ÷ 100)Taxable Base Amount = Total Amount × 100 ÷ (100 + GST Rate)For intra-state sales, CGST = GST Amount ÷ 2 and SGST = GST Amount ÷ 2. For inter-state sales, IGST = Full GST Amount.
Worked Example: ₹10,000 at 18% GST (Intra-state)
A supplier in Jaipur sells IT equipment worth ₹10,000 to a customer in Kota, Rajasthan.
Net payable amount to supplier is ₹11,800 including ₹1,800 total tax split equally between Center and State.