GST Calculator: Add, Remove & Price with Margin
Add or remove GST in one click, split it into CGST, SGST or IGST, and use margin mode to set the right selling price for your product or service.
This free GST calculator works three ways: add GST to a base amount, remove GST from an inclusive price (reverse GST), or use margin mode to price a product from its cost and profit. It also splits the tax into CGST + SGST (within a state) or IGST (between states).
Three ways to use this GST calculator
Add GST
Start with a base (pre-tax) amount and see the GST and the final price your customer pays.
Remove GST (reverse)
Have a GST-inclusive price like on a bill? Work backwards to find the original amount and the tax inside it.
Price with margin
Enter your cost and the profit margin you want, and get the exact GST-inclusive price to charge.
CGST, SGST and IGST explained
GST is split based on where the buyer and seller are. For a sale within the same state (intra-state), the tax is divided equally into CGST (central) and SGST (state), so 18% GST becomes 9% + 9%. For a sale between two states (inter-state), the whole tax is charged as IGST (18% stays 18%). The total tax is the same either way; only the split changes.
Common GST rate slabs in India
| GST rate | Typical goods and services |
|---|---|
| 0% / Exempt | Fresh fruit and vegetables, milk, bread, most unbranded food grains, education, health care. |
| 5% | Packaged food staples, tea, coffee, life-saving drugs, economy air travel, small restaurants. |
| 12% | Processed foods, butter and cheese, mobile phones, business-class-adjacent services, some apparel. |
| 18% | Most services (including digital marketing and IT), soaps, electronics, branded garments, restaurants with AC. |
| 28% | Luxury and sin goods, cars, air conditioners, aerated drinks, tobacco (plus cess). |
Frequently asked questions
How do I remove GST from a total (reverse GST)?
To find the base amount from a GST-inclusive price, divide the total by (1 + rate/100). For example, at 18% GST, base = total / 1.18, and the GST is the difference. This calculator’s Remove GST mode does it instantly, including the CGST or SGST split.
What is the difference between CGST, SGST and IGST?
CGST and SGST apply together on sales within one state (each is half the GST rate), going to the central and state governments respectively. IGST applies as a single tax on inter-state sales. The total tax you pay is identical, only the split and destination differ.
How does margin mode help me price a product?
Enter your cost price and the profit margin percentage you want on that cost. The tool adds your profit to get the taxable value, then adds GST on top to show the final price the customer pays, so you never under-price and lose margin to tax.
What GST rate applies to digital marketing services?
Most professional and digital services in India, including digital marketing, SEO and web development, fall under the 18% GST slab. Always confirm your SAC code and the current rate, as slabs can be revised by the GST Council.
Is my data sent anywhere?
No. This calculator runs entirely in your browser. Nothing you type is uploaded or stored on any server.
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