GST Calculator India — Add or Remove GST
GST calculator for India's 5% & 18% slabs (plus 0%, 3%, 12%, 28%): add GST to a price or extract it from an MRP with instant CGST/SGST split.
Why you’ll love GST Calculator India — Add or Remove GST
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No signup, no paywall, no limits — GST Calculator India — Add or Remove GST works the moment the page loads.
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Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Accurate & clear
Built on the real formulas, with a breakdown you can actually trust.
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About GST Calculator India — Add or Remove GST
This GST calculator works in both directions: add GST to a base price to get the invoice total, or remove GST from a tax-inclusive price (like an MRP) to recover the base amount and the tax inside it. Pick a slab — 0%, 3%, 5%, 12%, 18% or 28% — and it instantly shows the net amount, total GST, the CGST/SGST split and the gross amount. It runs fully in your browser with no sign-up, so quotes and invoice figures never leave your device.
Adding GST is simple multiplication: GST = base × rate ÷ 100. Extracting it is where people slip up — the calculator uses the correct reverse formula, GST = gross − gross ÷ (1 + rate ÷ 100). So a ₹1,180 price that includes 18% GST breaks into a ₹1,000 base and ₹180 tax (₹90 CGST + ₹90 SGST), not the ₹212.40 you would get by wrongly taking 18% of ₹1,180.
The slabs cover India's current structure and its history: since the GST rate rationalisation of 22 September 2025, most goods and services fall under the 5% and 18% slabs, with 3% for gold and silver and 0% for exempt items, while the older 12% and 28% rates remain in the list for checking pre-reform invoices and transition-period bills. The half-and-half CGST/SGST figures apply to intra-state supplies; for inter-state sales the same total is simply charged as one IGST amount.
Popular uses
Frequently asked questions
Divide the inclusive price by (1 + rate/100) to get the base, and the difference is the GST. For an 18% item priced at ₹1,180: base = 1,180 ÷ 1.18 = ₹1,000, GST = ₹180. The calculator's "Remove" mode does this automatically — never subtract 18% of the gross figure, which would overstate the tax (₹212.40 in this example instead of ₹180).
On an intra-state sale (seller and buyer in the same state), the GST is collected half as Central GST and half as State GST — an 18% invoice shows 9% CGST + 9% SGST, which is the split this calculator displays. On an inter-state sale, the full amount is charged as a single IGST instead; the total tax is identical, only the label and the government it flows to change.
After the rate rationalisation that took effect on 22 September 2025, most goods and services sit in just two slabs — 5% and 18% — alongside 0% for exempt essentials, 3% for gold and silver, and a higher special rate reserved for a short list of luxury and sin goods. The 12% and 28% slabs were largely phased out, but they matter when you are checking invoices dated before the change, which is why they stay selectable here.
GST applies to the transaction value — the price after any discount recorded on the invoice itself. So for a ₹1,000 item sold with a 10% invoice discount, GST is calculated on ₹900. Post-sale discounts are trickier and generally cannot reduce the GST already charged unless they were agreed before supply, so calculate on the actual invoiced figure.
No. MRP is by definition inclusive of all taxes, and charging GST above MRP is illegal in India. Use the calculator's "Remove" mode to see how much tax is already inside an MRP — useful for registered sellers who need to show the CGST/SGST break-up of an MRP item on a tax invoice.
GST Calculator India — Add or Remove GST is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
It uses the standard formulas and shows its working, so you can verify every number. For big decisions, treat the result as a reliable estimate.
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