What this estimate uses
Amount, GST rate, Calculation mode.
Business calculator
How much GST is included in this price?
Add GST to a base price or extract GST from a tax-inclusive amount.
Your estimate
Live result
Amount including GST
—How it works
A useful estimate, with the assumptions out in the open.
The presets reflect the post-22 September 2025 structure plus the 3% special rate. For an intra-state transaction, tax is displayed as equal CGST and SGST portions. Confirm the exact HSN/SAC rate, exemptions, cess and place-of-supply treatment for the actual supply.
This result is an educational estimate. Rates, taxes, fees, product rules, and market returns can change.
India-focused guide
How do I add GST to or remove GST from an invoice amount?
Enter your own values above to calculate GST-inclusive and GST-exclusive values for a chosen Indian GST rate. The live result separates the most important totals so you can compare scenarios before making a decision.
Important assumption
The presets reflect the post-22 September 2025 structure plus the 3% special rate. For an intra-state transaction, tax is displayed as equal CGST and SGST portions. Confirm the exact HSN/SAC rate, exemptions, cess and place-of-supply treatment for the actual supply.
Created and maintained byAll Tool Central
Formula and content reviewed20 August 2026
See how estimates are builtCalculation methodology
Detailed guide
Understand the result before using it.
This GST calculator handles both directions of a common invoice calculation: adding tax to a taxable value and extracting the taxable value from a GST-inclusive total. It also separates intra-state tax equally into CGST and SGST for a quick invoice cross-check.
How GST is added or removed
In Add GST mode, the amount entered is treated as the taxable value. GST is calculated on that value and added to produce the invoice total.
In Remove included GST mode, the amount entered is treated as the tax-inclusive total. Dividing by one plus the GST rate recovers the taxable value. Simply subtracting 18% from an 18%-inclusive total would be incorrect because the tax is 18% of the smaller taxable value, not 18% of the total.
FormulaGST-inclusive total = taxable value × (1 + GST rate); taxable value = inclusive total ÷ (1 + GST rate)
Example: add and remove 18% GST
The two rows below describe the same transaction from opposite starting points. For an intra-state supply, the calculator displays the ₹1,800 tax as ₹900 CGST plus ₹900 SGST.
| Mode | Amount entered | Taxable value | GST amount | Result |
|---|---|---|---|---|
| Add GST | ₹10,000 | ₹10,000 | ₹1,800 | ₹11,800 inclusive |
| Remove GST | ₹11,800 | ₹10,000 | ₹1,800 | ₹10,000 before GST |
Choose the rate from the actual supply
India’s rate structure was rationalised from 22 September 2025 around 5% and 18%, with a 40% de-merit rate for specified supplies and separate special-rate treatment for some categories. A familiar product name alone is not enough to determine tax: classification, description, value, conditions and notification history can matter.
Use the selected percentage only after checking the current HSN or SAC entry and any exemption or cess. For an inter-state supply, the applicable tax is normally IGST rather than the equal CGST and SGST split displayed by this calculator.
What to verify before using the result on an invoice
- Confirm whether the quoted price is before tax or already GST-inclusive.
- Check the current HSN or SAC rate and any conditions on the official notification.
- Determine place of supply before choosing an intra-state or inter-state tax split.
- Apply invoice-level rounding and any cess according to the actual accounting process.
Common questions
Frequently asked questions
How do I remove 18% GST from a total amount?
Divide the GST-inclusive amount by 1.18 to get the taxable value. The difference between the total and that taxable value is the GST amount.
Are CGST and SGST always half of total GST?
The calculator uses an equal split for an intra-state transaction. An inter-state supply generally uses IGST, while place-of-supply and special transaction rules must be checked separately.
Does this calculator determine the correct GST rate for a product?
No. It performs arithmetic at the rate selected. The correct rate depends on the current HSN or SAC classification, description, conditions, exemptions and notifications.
Why are old 12% and 28% presets not shown?
The preset list reflects the rate rationalisation effective from 22 September 2025. Historical invoices must use the rate that applied at their time of supply, and special cases should be checked against official notifications.
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