GST Inclusive & Exclusive Price Calculator
Add GST to a price, or extract the GST already inside one.
Adding GST is easy. Extracting it from a tax-inclusive price is where people go wrong — subtracting 18% from the total does not give the base price. This calculator does both correctly and splits the tax into CGST, SGST or IGST depending on where the supply goes.
Amount and rate
Result
Fill in the fields above and your result will appear here.
What the GST Inclusive & Exclusive Price Calculator does
GST in India is charged on the taxable value of a supply. When a price is quoted inclusive of tax, the base has to be found by dividing rather than subtracting, because the tax was calculated on the base and not on the total.
The split depends on the place of supply. Within a state, the rate divides equally into central GST and state or union territory GST. Across states, a single integrated GST at the full rate applies instead. The total is identical either way — only the heads on the invoice differ.
How to use this tool
- Choose whether you are adding GST to a base price or extracting it from a tax-inclusive total.
- Enter the amount. When extracting, this is the full amount the customer pays.
- Select the GST rate for your goods or service.
- Choose intra-state or inter-state supply so the tax is split into the right heads.
- Add compensation cess only if your product attracts it — most do not.
Formula and method
Adding GST:
GST = Base × Rate ÷ 100
Total = Base × (1 + Rate ÷ 100)
Extracting GST from an inclusive total:
Base = Total ÷ (1 + Rate ÷ 100)
GST = Total − Base
Intra-state: CGST = SGST = Rate ÷ 2
Inter-state: IGST = full Rate
Worked example
Example: extracting 18% GST from ₹11,800
| Taxable value (11,800 ÷ 1.18) | ₹10,000.00 |
| CGST at 9% | ₹900.00 |
| SGST at 9% | ₹900.00 |
| Total | ₹11,800.00 |
Subtracting 18% from ₹11,800 would give ₹9,676 — understating the taxable value by ₹324 and producing a return that does not reconcile.
What your result means
The taxable value is what goes into your books as revenue and what your margin should be measured against. The GST portion was never yours.
The CGST and SGST split matters for filing, not for the customer — the total is the same. Getting the heads wrong causes mismatches in your returns.
The invoice total is what the customer pays and what appears on the payment.
Important considerations
- The place of supply, not your location alone, decides whether CGST and SGST or IGST applies. For services the rules differ from goods.
- If you are registered and claim input tax credit, the GST you pay on purchases is recoverable and should not be treated as a cost.
- Businesses under the composition scheme cannot charge GST on invoices or claim input credit, and pay a flat rate on turnover instead.
- Rate changes are notified periodically and apply from a specified date. Check the current rate for your HSN or SAC code.
- Reverse charge shifts the liability to the recipient for certain supplies, which this calculator does not model.
Limitations of this tool
- It calculates tax on a single amount. It is not a return-filing tool and does not handle input tax credit, reverse charge or place-of-supply determination.
- HSN and SAC classification determines the correct rate and is not something a calculator can decide for you.
- Composition scheme, exports, zero-rated supplies and exempt supplies each follow different rules that are outside this tool.
Frequently asked questions
How do I remove GST from a price?
Divide by (1 + rate ÷ 100). For 18% GST, divide the total by 1.18. Subtracting 18% from the total is wrong and understates the base price.
What is the difference between CGST, SGST and IGST?
For supply within a state, the rate splits equally into CGST (central government) and SGST (state government). For supply between states, a single IGST at the full rate is charged instead. The customer pays the same total either way.
Is GST calculated on the discounted price?
Yes, where the discount is shown on the invoice and is agreed at or before the time of supply. Post-sale discounts have separate conditions under GST law.
Do I need to charge GST if I am not registered?
No — an unregistered business cannot charge GST or claim input credit. Registration is mandatory above the prescribed turnover threshold, which differs for goods and services and by state.