GST Calculator
Add GST to a price, or pull GST back out of a price that already includes it — pick a rate slab, choose intra-state or inter-state, and the breakdown updates instantly. Every figure is rounded to the paisa, so CGST + SGST (or IGST) always add up exactly to the total tax shown.
Breakdown
| Net amount | ₹0.00 |
|---|---|
| CGST | ₹0.00 |
| SGST | ₹0.00 |
| Total GST | ₹0.00 |
| Gross amount | ₹0.00 |
Results and any AI-generated content from this tool are provided free, "as is", for general informational purposes only and may be inaccurate, incomplete, or out of date. Always verify the output yourself before relying on it — you use this tool and its results at your own risk.
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How this GST calculator works
GST (Goods and Services Tax) is charged as a percentage of a product or service's price. This calculator works both directions: Add GST takes an amount that excludes tax and adds the GST on top to find the price a customer actually pays; Remove GST takes a final price that already includes tax and works backward to find the original base amount and the tax hidden inside it. Every figure is calculated in whole paise (not floating-point rupees) and rounded half-up exactly once, so the tax split you see never fails to add back up to the total — CGST + SGST (or IGST) always equals the GST amount shown, to the paisa.
Worked examples for each GST slab
5% GST (e.g. household necessities, small restaurants): ₹1,000 + 5% GST = ₹1,050 gross, with ₹25 CGST + ₹25 SGST on an intra-state sale, or ₹50 IGST on an inter-state sale.
12% GST (e.g. business class air travel, some processed foods): ₹1,000 + 12% GST = ₹1,120 gross, with ₹60 CGST + ₹60 SGST, or ₹120 IGST.
18% GST (the default slab — most services, electronics): ₹1,000 + 18% GST = ₹1,180 gross, with ₹90 CGST + ₹90 SGST, or ₹180 IGST.
28% GST (e.g. luxury and sin goods): ₹1,000 + 28% GST = ₹1,280 gross, with ₹140 CGST + ₹140 SGST, or ₹280 IGST.
Intra-state vs inter-state GST
When a sale happens within the same state, GST splits equally into CGST (Central GST) and SGST (State GST) — each collected by a different government but adding up to the same total tax rate. When a sale crosses a state border, the full amount is charged as IGST (Integrated GST) instead, collected once by the Centre and settled with the destination state. Choosing the wrong option on an invoice is a common compliance mistake, so this calculator makes the split explicit rather than just showing one combined tax figure.
Already have a final price and need the base amount and tax it contains instead? Use the dedicated Reverse GST Calculator — same paisa-accurate math, tuned for invoices where you only know the price a customer paid.
Once your pricing and invoices are sorted, put your GST number, address, and payment details on a free BizGo business page so customers and vendors always have your correct billing details on hand — see the box above to get started.
Frequently Asked Questions
Select "Add GST", enter the amount that excludes tax, pick a rate (5%, 12%, 18%, 28%, or a custom rate), and the calculator shows the GST amount and the final gross price instantly.
Select "Remove GST" and enter the final price a customer paid. The calculator works backward using base = gross × 100 / (100 + rate) to find the original amount and the tax hidden inside it.
CGST and SGST apply to sales within the same state and split the total GST rate equally between the Central and State governments. IGST applies to inter-state sales and charges the full rate as one tax, collected by the Centre.
Yes. All math is done in whole paise (not floating-point rupees) with a single half-up rounding step, so CGST + SGST (or IGST) always add up exactly to the total GST shown — even on odd amounts like ₹999.99.
The common slabs — 5%, 12%, 18%, and 28% — are available as one-click chips, and you can also type in any custom rate, including decimals like 3% or 0.25%.
