GST Calculator
Quickly calculate GST-inclusive or GST-exclusive prices at 5%, 12%, 18% or 28%, with a full CGST/SGST breakdown.
How to use GST Calculator
- 1Enter the amount.
- 2Choose whether you want to add GST (exclusive to inclusive) or remove GST (inclusive to exclusive).
- 3Select the applicable GST rate.
- 4View the base amount, GST amount and CGST/SGST split.
About GST Calculator
Goods and Services Tax (GST) in India is charged at standard slabs of 5%, 12%, 18% and 28%. This calculator lets you add GST to a base amount to find the final price, or remove GST from a total to find the original base amount — and splits the tax into CGST and SGST for intra-state supply.
GST Formula
To remove GST from an inclusive amount: Base Amount = Inclusive Amount / (1 + GST Rate/100). CGST and SGST are each half of the total GST for intra-state transactions.
Example Calculation
Adding 18% GST to a base amount of ₹1,000.
| Base Amount | ₹1,000 |
| GST Rate | 18% |
| GST Amount | ₹180 |
| CGST (9%) | ₹90 |
| SGST (9%) | ₹90 |
| Total Amount | ₹1,180 |
Benefits
- • Quickly generate GST-inclusive prices for invoices and quotes.
- • Reverse-calculate the base price from a GST-inclusive total.
- • See the CGST/SGST split needed for intra-state billing.
Common mistakes
- • Applying GST twice by adding it to an amount that already includes GST.
- • Using the wrong slab — always confirm the correct GST rate for your specific goods or service.
- • Forgetting that inter-state supply uses IGST instead of a CGST/SGST split.
Frequently Asked Questions
The standard Indian GST slabs: 5%, 12%, 18% and 28%, plus a custom rate option.
For sales within the same state, GST is split equally between CGST (central) and SGST (state). For inter-state sales, IGST applies as a single combined tax instead.
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