Calculate Indian Goods & Services Tax (GST) instantly with our free GST Calculator 🇮🇳. Compute Additive GST (+) or Inclusive GST (-), split CGST/SGST for intra-state sales, calculate IGST for inter-state billing, and support 5%, 12%, 18%, and 28% tax slabs with 100% offline privacy.
Choose Add GST (+) to add tax to a net price or Remove GST (-) to extract tax from an inclusive price, then choose Intra-State or Inter-State.
Input your transaction amount in INR (₹) and select a standard GST tax slab (5%, 12%, 18%, 28%) or enter a custom rate.
Instantly view the net base price, exact CGST/SGST/IGST tax components, gross total amount, and base vs tax split bar.
Your financial figures are processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool 100% private.
Calculations run locally in real time as you type. Tax breakdowns, CGST/SGST splits, and total gross amounts update instantly without page reloads.
Accurately calculates dual state tax components (CGST + SGST) for intra-state billing or integrated tax (IGST) for inter-state commercial invoices.
Goods & Services Tax (GST) is a comprehensive multi-stage indirect tax levied on the supply of goods and services in India.
The core GST formulas implemented in this calculator are:
\(\text{Additive GST (Add GST +):}\)
\(\text{GST Tax Amount} = \text{Net Base Price} \times \left(\frac{\text{GST Rate}}{100}\right)\)
\(\text{Gross Price} = \text{Net Base Price} + \text{GST Tax Amount}\)
\(\text{Inclusive GST (Remove GST -):}\)
\(\text{Net Base Price} = \frac{\text{Inclusive Gross Price}}{1 + \frac{\text{GST Rate}}{100}}\)
\(\text{GST Tax Amount} = \text{Inclusive Gross Price} - \text{Net Base Price}\)
For transactions within the same state (Intra-State), tax revenue is split 50/50 between Central Government (CGST) and State Government (SGST). For transactions between different states (Inter-State), Integrated GST (IGST) applies.