TopToolsAiCalculate India GST (Goods and Services Tax) at any of the standard slabs — 5%, 12%, 18% or 28% — either adding GST on top or extracting it from a tax-inclusive total. A ₹1,000 item under the 18% slab comes to ₹1,180 total, while the same item under the 5% slab, applied to many essential goods, comes to just ₹1,050 — the four slabs exist specifically to tax essentials lower than luxury items.
Last updated: 1 Sep 2026
How to use India GST Calculator
- Enter the amount and select the GST slab (5%, 12%, 18% or 28%).
- Choose "Add GST" if your amount is before tax, or "Extract from total" if it already includes GST.
- Click "Calculate" to see the net, GST and total amounts.
Frequently asked questions
How do I know which GST slab applies to my item?
GST slabs are assigned by the government per category of goods/services — check the official GST rate finder or your invoice/supplier for the correct slab.
What's the difference between CGST, SGST and IGST?
This calculator shows total GST. For intra-state transactions it splits into CGST+SGST (each half the rate); for inter-state it is IGST at the full rate.
Can a business claim back the GST it pays?
Yes — registered businesses can typically claim Input Tax Credit (ITC) on GST paid for business purchases, offsetting it against GST collected on sales.
Is GST charged on top of the listed price?
It depends on how the price is quoted — MRP labels usually already include GST, while B2B invoices commonly show it added separately.
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