GST Calculator
Add or remove GST on any amount at the standard Indian GST slabs (0/3/5/12/18/28%). See CGST + SGST split for intra-state supply or IGST for inter-state supply.
On a net amount of ₹10,000.00, 18% GST adds ₹1,800.00 — total invoice ₹11,800.00. Since this is intra-state, GST is split as CGST ₹900.00 + SGST/UTGST ₹900.00.
How GST Calculator works
Add GST — enter the net (pre-tax) amount to see total including GST. Remove GST — enter the gross (tax-inclusive) amount to back out the base price.
Tap 0%, 3%, 5%, 12%, 18% or 28% — the official Indian GST slabs — or enter a custom rate.
Total GST, net price and gross invoice total appear instantly, with CGST + SGST split for intra-state or full IGST for inter-state supply.
Frequently asked
How do I add GST to a price?+
Tap 'Add GST', enter your net amount and pick the slab. Example: ₹10,000 at 18% GST → gross ₹11,800 (net ₹10,000 + GST ₹1,800).
How do I remove GST from a gross amount?+
Tap 'Remove GST' and enter the gross (invoice) amount. The calculator uses net = gross / (1 + rate) to reverse-calculate. Example: ₹11,800 at 18% GST → net ₹10,000 + GST ₹1,800.
What's the difference between CGST, SGST and IGST?+
For intra-state supply (buyer and seller in the same state), GST is split equally between CGST (Central) and SGST (State). For inter-state supply, the full amount is IGST (Integrated GST) collected by the Centre and distributed. Union Territories use UTGST instead of SGST.
Which items fall under which GST slab?+
0% — essential food grains, milk, etc. 5% — mass consumption (edible oil, tea, coffee, some medicines). 12% — computers, processed food. 18% — most services, electronics, restaurants. 28% — luxury items, tobacco, aerated drinks, high-end cars.
Is this GST calculator accurate for GST returns?+
Yes for the arithmetic. For filing GSTR-1, GSTR-3B or GST audit, always cross-check against your invoice ledger and reconcile with e-invoicing / e-way bills as required.
Does this store my data?+
No — everything runs in your browser. Your amounts are never uploaded.