GST Calculator
Add GST to a base price or pull the GST out of an inclusive price, with the CGST and SGST split shown for every slab.
Reviewed by the CalcCafe editorial team · Last updated 18 July 2026 · How we test our tools
Example
A service is billed at ₹10,000 before tax under the standard 18% slab. GST = 10,000 × 18% = ₹1,800, split into ₹900 CGST and ₹900 SGST for an intra-state sale, so the invoice total is ₹11,800. If you instead start from an inclusive price of ₹11,800 and switch the mode to “remove GST”, the tool works backwards to the same ₹10,000 base and ₹1,800 tax.
How it works
In add mode the amount you enter is treated as the tax-exclusive base: GST = base × rate ÷ 100, and total = base + GST. In remove mode the amount is treated as tax-inclusive: base = amount ÷ (1 + rate ÷ 100), and GST = amount − base. For an intra-state supply the GST is split equally — CGST = GST ÷ 2 to the centre and SGST (or UTGST in union territories) = GST ÷ 2 to the state. For an inter-state supply the same total is charged as a single IGST line instead.
Good to know
India’s Goods and Services Tax, in force since 1 July 2017, replaced a patchwork of central and state levies (excise, service tax, VAT, octroi) with one destination-based tax. On a sale within a state, the tax is split equally between the centre (CGST) and the state (SGST) — an 18% invoice shows 9% + 9%. On a sale across state lines, the centre collects the whole amount as IGST and later settles the state’s share. The rate you pay is identical either way; only the invoice lines differ.
Rates are set by the GST Council in slabs. 5% covers many essentials such as packaged food items, footwear below price thresholds and economy transport; 12% is an intermediate slab for items like processed foods and some appliances; 18% is the default for most services and manufactured goods — telecom, restaurants without ITC arrangements, software, electronics; and 28% applies to luxury and “sin” goods such as large cars, tobacco and aerated drinks, often with an additional compensation cess on top. Gold and precious stones sit in a special 3% slab (0.25% for rough diamonds).
Whether a quoted price includes GST matters more than people expect. Consumer MRPs in India are inclusive by law, so working out the tax buried inside a ₹999 MRP needs the remove-GST formula, not a straight percentage. Business quotes and contracts are usually exclusive, with GST added on the invoice. Mixing the two up in either direction misstates the price by the full slab rate, which is why this calculator makes the mode an explicit choice rather than an assumption.
Registered businesses (turnover above ₹40 lakh for goods or ₹20 lakh for services in most states) get a GSTIN and can claim input tax credit — GST paid on purchases offsets GST collected on sales, so the tax effectively lands only on the value added at each stage. Small businesses below ₹1.5 crore turnover can opt into the composition scheme instead: a flat 1–6% levy on turnover with minimal filing, but no input credit and no ability to charge GST to customers. Rates and thresholds change with Council decisions, so confirm the current schedule on the official portals before invoicing.
Frequently asked questions
What is the difference between CGST, SGST and IGST?
They are the same tax collected by different governments. On a sale within one state the rate is split half-and-half: CGST goes to the central government and SGST (UTGST in union territories) to the state. On a sale between states the full rate is collected once as IGST by the centre, which then settles the destination state's share. The total tax on the buyer is identical in both cases.
How do I remove GST from a price that already includes it?
Divide the inclusive price by 1 plus the rate as a decimal. For an 18% item, base price = inclusive price divided by 1.18, and the GST is the difference. Simply taking 18% of the inclusive price overstates the tax — use the remove-GST mode in this calculator to get the exact split.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser. The amounts you enter never leave your device, and the tool keeps working offline once the page has loaded.
Is this GST calculator free?
Yes, completely free with no sign-up, no limits and no watermarks on the results.
People also ask
What are the GST rates in India?
The main slabs are 5%, 12%, 18% and 28%, with 18% applying to most services and manufactured goods and 28% to luxury and sin goods (often plus cess). Gold is taxed at a special 3% rate and rough diamonds at 0.25%. Some essentials like fresh produce, milk and education services are exempt entirely.
Is GST calculated on MRP?
No extra GST is added on top of MRP — the maximum retail price printed on consumer goods in India already includes all taxes. To find the tax inside an MRP, use the remove-GST calculation: divide the MRP by 1 plus the slab rate to get the base price, and the remainder is the GST.
What is the GST composition scheme?
It is a simplified option for small businesses with turnover up to ₹1.5 crore (₹75 lakh in some special-category states). They pay a flat 1–6% of turnover depending on the business type, file simpler returns, but cannot collect GST from customers or claim input tax credit.
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Sources & references
These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.