Tool 06 / Business & Finance
GST Calculator
Calculate GST-exclusive and GST-inclusive amounts for any rate. See the taxable value, the GST portion, the total, and the CGST/SGST split used for intra-state invoices.
Enter a positive number.
Presets cover common slabs; edit the custom field for others.
Overrides the preset above.
GST added to the amount
- Taxable value
- ₹10,000
- GST @ 18%
- ₹1,800
- CGST (½)
- ₹900
- SGST (½)
- ₹900
GST was added to the base: ₹10,000 × 18% = ₹1,800. Inter-state supplies normally show the same total as IGST instead of CGST + SGST.
Manual
04 stepsHow to use it
- 01Choose whether your amount already includes GST or not.
- 02Enter the amount and select a rate such as 5%, 12%, 18% or 28%.
- 03Read the taxable value, GST amount, total and CGST/SGST split.
- 04Copy the breakdown into a quote or invoice.
Example
What it looks like
- Input
- GST-exclusive amount ₹10,000 at 18%
- Output
- Taxable value ₹10,000 · GST ₹1,800 · Total ₹11,800 (CGST ₹900 + SGST ₹900)
For inter-state supplies, the same ₹1,800 is usually shown as IGST instead.
Method
How it works
For exclusive amounts the GST is simple multiplication: GST = amount × rate ÷ 100. The total is amount + GST.
For inclusive amounts the base must be extracted, because the amount already contains tax. Taxable value = amount × 100 ÷ (100 + rate), and GST = amount − taxable value.
The calculator splits the GST into CGST and SGST for display because intra-state invoices usually show two equal components. Intra-state versus inter-state is a legal classification we do not determine — confirm the correct treatment with your accountant.
FAQ
Before you ask
Specific to gst calculator, including limits and privacy.
Is the GST rate always 18%?
No. Rates vary by goods or service and change with government notifications. Enter your own rate if it differs from the presets, and verify against the current official schedule.
What is the difference between inclusive and exclusive GST?
Exclusive means GST is added on top of your price. Inclusive means the price you quote already contains the GST, so the tax has to be extracted from it.
Does this check my GSTIN?
No. The tool only does arithmetic. It does not validate GSTINs, filing status or compliance requirements, and nothing is filed on your behalf.
How do I round GST?
Tax amounts are often rounded to the nearest rupee on invoices. This calculator shows two decimal places; apply your own rounding rule and keep it consistent.
Privacy
Amounts are calculated in your browser and never stored.
Read the privacy policy for data retention, analytics and contact details.
Limits
This calculator is an arithmetic aid only. GST rates, place of supply and compliance rules are set by law — verify with a qualified professional before invoicing or filing.
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