Calculate GST-exclusive and GST-inclusive amounts using preset or custom rates.
Calculate with the GST Calculator
Enter the details below. Required values are validated before results are shown.
GST Calculator results
How to use the GST Calculator
- Choose the display currency and any calculation mode or frequency.
- Enter each required value using a consistent currency and time basis.
- Select Calculate or press Enter.
- Review the result explanation, assumptions, and any schedule before relying on the estimate.
Worked example
Adding 18% GST to ₹1,000 produces ₹180 GST and a ₹1,180 total; reversing ₹1,180 returns a ₹1,000 base.
Understanding the results
The summary separates the most important output from supporting values. Currency selection changes formatting only; it does not convert exchange rates or alter a currency-independent formula.
Frequently asked questions
When should GST be split into CGST and SGST?
For an intra-state supply, GST is shown equally as CGST and SGST; IGST is shown as the full tax amount for interstate reference. The result depends on the values and assumptions entered, so compare it with the applicable provider or official rule.
Can I use decimal values in the GST Calculator?
Yes. Decimal values are supported. Results are calculated at full JavaScript numeric precision and formatted for readability.
Are the GST Calculator results guaranteed?
No. The calculator provides an estimate based on the entered assumptions and is not financial, tax, investment, lending, payroll, or legal advice.