Calculate GST on any amount instantly — add GST to a base price or extract it from a GST-inclusive total. Supports all standard Indian GST slabs (5%, 12%, 18%, 28%) plus a custom rate, with a CGST + SGST breakdown.
The Goods and Services Tax replaced over a dozen separate central and state indirect taxes with a single, destination-based tax applied uniformly across India. It's structured as a multi-stage, value-added tax: GST is charged at every point of sale, but businesses can claim input tax credit for GST they've already paid on their purchases, so the net tax burden reflects only the value added at each stage rather than compounding at every step, as the earlier cascading tax system often did. For consumers and businesses alike, understanding how much GST applies to a given transaction — and how to move between a tax-exclusive base price and a tax-inclusive final price — is a routine part of pricing, invoicing, and bookkeeping in India.
GST in India is organized into rate slabs rather than a single flat rate, reflecting a policy choice to tax essential goods lightly and luxury or discretionary goods more heavily. The 0% (nil-rated) category covers many essential food items and specific exempted services. The 5% slab covers items like packaged food, footwear below a price threshold, and certain transport services. The 12% and 18% slabs cover the majority of standard manufactured goods, processed foods, and professional or business services, with 18% being the single most commonly applied rate across the economy. The 28% slab is reserved for luxury items, automobiles, and specific 'sin' goods like tobacco and aerated beverages, several of which also attract an additional compensation cess. Because the GST Council periodically reviews and revises rates for specific product categories, it's good practice to confirm the current applicable rate for your exact good or service rather than assuming it hasn't changed.
India runs a dual GST model, meaning both the central and state governments levy tax on the same transaction, but the combined rate stays the same as a single unified GST rate would be. For an intra-state supply (buyer and seller in the same state), the total GST rate is split equally into CGST (collected by the central government) and SGST (collected by the state government) — an 18% supply becomes 9% CGST plus 9% SGST, for instance. For an inter-state supply, or for imports, IGST (Integrated GST) applies instead, charged as a single tax by the central government at the full combined rate, with the revenue subsequently apportioned to the destination state. This structure is why a GST-compliant tax invoice for a local sale shows two separate tax lines (CGST and SGST) rather than one, while an invoice for an inter-state sale shows a single IGST line at the same total rate.
An exclusive (or 'Add GST') calculation starts from a base price that doesn't include tax and calculates the final price a buyer pays, which is exactly how most B2B quotes and price lists are typically structured — a base price plus GST added on top. An inclusive (or 'Remove GST') calculation runs the same logic in reverse: given a final, already-taxed price — the kind you'd see on a retail receipt or an MRP-labeled product — it recovers the underlying base price and the GST portion embedded within it. The inclusive calculation requires dividing by (100 + rate) rather than simply applying the rate percentage to the total, since the rate is defined relative to the base amount, not the final total; using the wrong formula is one of the most frequent sources of GST calculation errors in practice, and it's precisely the distinction this calculator's two modes are built to handle correctly.
Getting the GST split right matters for more than just curiosity — it directly affects invoice compliance, input tax credit claims, and pricing decisions. A GST-registered business must show the correct CGST/SGST or IGST breakdown on every tax invoice it issues, and errors here can complicate a buyer's ability to claim input tax credit or trigger discrepancies during a GST return filing or audit. For consumers and freelancers quoting prices, correctly distinguishing between a tax-exclusive quote and a tax-inclusive final price avoids awkward surprises or disputes at payment time. This calculator is built to make both directions of that calculation fast, accurate, and transparent, showing every component of the result — base amount, GST amount, CGST, SGST, and total — rather than just a single final number.
GST Calculator handles one specific Indian tax calculation. These related calculators cover other everyday financial math you'll often need alongside it.