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Add or remove GST with the CGST/SGST split.
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GST Calculator adds GST to a price or works backwards from a GST-inclusive amount to find the base price and the tax. It shows the CGST and SGST split for sales within a state, or IGST for inter-state sales, with one-click presets for the current slabs of 5%, 18% and 40% (plus 3% for gold) — or enter any rate.
Open GST Calculator
Launch GST Calculator directly in your browser — there is nothing to download, install, or configure first.
Enter your values
Type your numbers or details into GST Calculator — fields update as you go.
Read your result instantly
GST Calculator recalculates the moment you change an input, so there is no button to press and no waiting.
Base price = inclusive price × 100 ÷ (100 + GST rate). For ₹1,180 at 18%, the base is ₹1,000 and GST is ₹180. Choose “Remove GST” to do this automatically.
Since 22 September 2025 most goods and services fall under 5% or 18%, with 40% for luxury and sin goods; some items are exempt and gold is 3%. Check the latest notification for your item.
For sales within a state, GST is split equally into CGST (central) and SGST (state). For sales to another state, the full amount is charged as IGST.
Yes. GST Calculator is completely free, with no account, no paywall, and no usage limits.
No. GST Calculator works instantly in any modern web browser — there is no software to install, no extension, and no sign-up.